Fix datetime.UTC to timezone.utc across agent-coordinator codebase

- Changed datetime.UTC to timezone.utc in advanced_ai.py
- Changed datetime.UTC to timezone.utc in realtime_learning.py
- Changed datetime.UTC to timezone.utc in jwt_handler.py
- Changed datetime.UTC to timezone.utc in distributed_consensus.py
- Changed datetime.UTC to timezone.utc in exceptions.py
- Changed datetime.UTC to timezone.utc in alerting.py
- Changed datetime.UTC to timezone.utc in communication.py
- Changed datetime.UTC to timezone.utc in message_types.py
- Updated imports from `datetime import

apps/agent-coordinator/src/app/ai/advanced_ai.py

@@ -10,7 +10,7 @@ try:
     import numpy as np
 except ImportError:  # pragma: no cover - optional dependency for runtime AI features
     np = None
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Dict, List, Any, Optional, Tuple
 from dataclasses import dataclass, field
 from collections import defaultdict
@@ -93,7 +93,7 @@ class AdvancedAIIntegration:
                     'hidden_sizes': hidden_sizes,
                     'output_size': output_size
                 },
-                'created_at': datetime.now(datetime.UTC).isoformat()
+                'created_at': datetime.now(timezone.utc).isoformat()
             }
             
         except Exception as e:
@@ -187,7 +187,7 @@ class AdvancedAIIntegration:
                 'final_loss': losses[-1] if losses else 0,
                 'accuracy': accuracy,
                 'training_data_size': len(training_data),
-                'trained_at': datetime.now(datetime.UTC).isoformat()
+                'trained_at': datetime.now(timezone.utc).isoformat()
             }
             
         except Exception as e:
@@ -218,7 +218,7 @@ class AdvancedAIIntegration:
                 'network_id': network_id,
                 'features': features,
                 'prediction': float(prediction[0][0]),
-                'timestamp': datetime.now(datetime.UTC).isoformat()
+                'timestamp': datetime.now(timezone.utc).isoformat()
             }
             self.predictions_history.append(prediction_record)
             
@@ -227,7 +227,7 @@ class AdvancedAIIntegration:
                 'network_id': network_id,
                 'prediction': float(prediction[0][0]),
                 'confidence': max(prediction[0][0], 1 - prediction[0][0]),
-                'predicted_at': datetime.now(datetime.UTC).isoformat()
+                'predicted_at': datetime.now(timezone.utc).isoformat()
             }
             
         except Exception as e:
@@ -261,7 +261,7 @@ class AdvancedAIIntegration:
                 'model_type': model_type,
                 'features': features,
                 'target': target,
-                'created_at': datetime.now(datetime.UTC).isoformat()
+                'created_at': datetime.now(timezone.utc).isoformat()
             }
             
         except Exception as e:
@@ -286,7 +286,7 @@ class AdvancedAIIntegration:
             
             model.accuracy = accuracy
             model.training_data_size = len(training_data)
-            model.last_trained = datetime.now(datetime.UTC)
+            model.last_trained = datetime.now(timezone.utc)
             
             # Store performance
             self.model_performance[model_id].append(accuracy)
@@ -405,7 +405,7 @@ class AdvancedAIIntegration:
                 'model_id': model_id,
                 'features': features,
                 'prediction': prediction,
-                'timestamp': datetime.now(datetime.UTC).isoformat()
+                'timestamp': datetime.now(timezone.utc).isoformat()
             }
             self.predictions_history.append(prediction_record)
             
@@ -414,7 +414,7 @@ class AdvancedAIIntegration:
                 'model_id': model_id,
                 'prediction': prediction,
                 'confidence': min(1.0, max(0.0, prediction)) if model.model_type == 'logistic_regression' else None,
-                'predicted_at': datetime.now(datetime.UTC).isoformat()
+                'predicted_at': datetime.now(timezone.utc).isoformat()
             }
             
         except Exception as e:
@@ -451,7 +451,7 @@ class AdvancedAIIntegration:
                 'model_performance': model_stats,
                 'training_data_sizes': training_stats,
                 'available_model_types': list(set(model.model_type for model in self.models.values())),
-                'last_updated': datetime.now(datetime.UTC).isoformat()
+                'last_updated': datetime.now(timezone.utc).isoformat()
             }
             
         except Exception as e:

apps/agent-coordinator/src/app/ai/realtime_learning.py

@@ -4,7 +4,7 @@ Implements adaptive learning, predictive analytics, and intelligent optimization
 """
 
 import asyncio
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Dict, List, Any, Optional, Tuple
 from dataclasses import dataclass, field
 from collections import defaultdict, deque
@@ -55,7 +55,7 @@ class RealTimeLearningSystem:
         try:
             experience = LearningExperience(
                 experience_id=str(uuid.uuid4()),
-                timestamp=datetime.now(datetime.UTC),
+                timestamp=datetime.now(timezone.utc),
                 context=experience_data.get('context', {}),
                 action=experience_data.get('action', ''),
                 outcome=experience_data.get('outcome', ''),
@@ -157,7 +157,7 @@ class RealTimeLearningSystem:
             features=['action', 'context_load', 'context_agents'],
             target='performance_score',
             accuracy=0.85,
-            last_updated=datetime.now(datetime.UTC)
+            last_updated=datetime.now(timezone.utc)
         )
         
         self.models['performance'] = performance_model
@@ -169,7 +169,7 @@ class RealTimeLearningSystem:
             features=['action', 'context_time', 'context_resources'],
             target='success_probability',
             accuracy=0.82,
-            last_updated=datetime.now(datetime.UTC)
+            last_updated=datetime.now(timezone.utc)
         )
         
         self.models['success'] = success_model
@@ -257,7 +257,7 @@ class RealTimeLearningSystem:
         try:
             total_experiences = len(self.experiences)
             recent_experiences = [exp for exp in self.experiences 
-                                 if exp.timestamp > datetime.now(datetime.UTC) - timedelta(hours=24)]
+                                 if exp.timestamp > datetime.now(timezone.utc) - timedelta(hours=24)]
             
             if not self.experiences:
                 return {
@@ -299,7 +299,7 @@ class RealTimeLearningSystem:
     def _get_last_adaptation_time(self) -> Optional[str]:
         """Get the time of the last adaptation"""
         # This would be tracked in a real implementation
-        return datetime.now(datetime.UTC).isoformat() if len(self.experiences) > 50 else None
+        return datetime.now(timezone.utc).isoformat() if len(self.experiences) > 50 else None
     
     async def recommend_action(self, context: Dict[str, Any], available_actions: List[str]) -> Dict[str, Any]:
         """Recommend the best action based on learning"""

apps/agent-coordinator/src/app/auth/jwt_handler.py

@@ -3,7 +3,7 @@ JWT Authentication Handler for AITBC Agent Coordinator
 Implements JWT token generation, validation, and management
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Dict, Any, Optional, List
 import secrets
 
@@ -26,15 +26,15 @@ class JWTHandler:
 
         try:
             if expires_delta:
-                expire = datetime.now(datetime.UTC) + expires_delta
+                expire = datetime.now(timezone.utc) + expires_delta
             else:
-                expire = datetime.now(datetime.UTC) + self.token_expiry
+                expire = datetime.now(timezone.utc) + self.token_expiry
             
             # Add standard claims
             token_payload = {
                 **payload,
                 "exp": expire,
-                "iat": datetime.now(datetime.UTC),
+                "iat": datetime.now(timezone.utc),
                 "type": "access"
             }
             
@@ -57,12 +57,12 @@ class JWTHandler:
         import jwt
 
         try:
-            expire = datetime.now(datetime.UTC) + self.refresh_expiry
+            expire = datetime.now(timezone.utc) + self.refresh_expiry
             
             token_payload = {
                 **payload,
                 "exp": expire,
-                "iat": datetime.now(datetime.UTC),
+                "iat": datetime.now(timezone.utc),
                 "type": "refresh"
             }
             
@@ -227,7 +227,7 @@ class APIKeyManager:
             key_data = {
                 "user_id": user_id,
                 "permissions": permissions or [],
-                "created_at": datetime.now(datetime.UTC).isoformat(),
+                "created_at": datetime.now(timezone.utc).isoformat(),
                 "last_used": None,
                 "usage_count": 0
             }
@@ -258,7 +258,7 @@ class APIKeyManager:
             key_data = self.api_keys[api_key]
             
             # Update usage statistics
-            key_data["last_used"] = datetime.now(datetime.UTC).isoformat()
+            key_data["last_used"] = datetime.now(timezone.utc).isoformat()
             key_data["usage_count"] += 1
             
             return {

apps/agent-coordinator/src/app/consensus/distributed_consensus.py

@@ -4,7 +4,7 @@ Implements various consensus algorithms for distributed decision making
 """
 
 import asyncio
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Dict, List, Any, Optional, Set, Tuple
 from dataclasses import dataclass, field
 from collections import defaultdict
@@ -59,7 +59,7 @@ class DistributedConsensus:
             node = ConsensusNode(
                 node_id=node_id,
                 endpoint=endpoint,
-                last_seen=datetime.now(datetime.UTC),
+                last_seen=datetime.now(timezone.utc),
                 reputation_score=node_data.get('reputation_score', 1.0),
                 voting_power=node_data.get('voting_power', 1.0),
                 is_active=True
@@ -70,7 +70,7 @@ class DistributedConsensus:
             return {
                 'status': 'success',
                 'node_id': node_id,
-                'registered_at': datetime.now(datetime.UTC).isoformat(),
+                'registered_at': datetime.now(timezone.utc).isoformat(),
                 'total_nodes': len(self.nodes)
             }
             
@@ -98,8 +98,8 @@ class DistributedConsensus:
                 proposal_id=proposal_id,
                 proposer_id=proposer_id,
                 proposal_data=proposal_data.get('content', {}),
-                timestamp=datetime.now(datetime.UTC),
-                deadline=datetime.now(datetime.UTC) + self.voting_timeout,
+                timestamp=datetime.now(timezone.utc),
+                deadline=datetime.now(timezone.utc) + self.voting_timeout,
                 required_votes=required_votes
             )
             
@@ -186,7 +186,7 @@ class DistributedConsensus:
             
             # Record vote
             proposal.current_votes[node_id] = vote
-            self.nodes[node_id].last_seen = datetime.now(datetime.UTC)
+            self.nodes[node_id].last_seen = datetime.now(timezone.utc)
             
             # Check if consensus is reached
             await self._check_consensus(proposal)
@@ -216,7 +216,7 @@ class DistributedConsensus:
             total_votes = len(proposal.current_votes)
             
             # Check if deadline passed
-            if datetime.now(datetime.UTC) > proposal.deadline:
+            if datetime.now(timezone.utc) > proposal.deadline:
                 proposal.status = 'expired'
                 await self._finalize_proposal(proposal, False, 'Deadline expired')
                 return
@@ -266,7 +266,7 @@ class DistributedConsensus:
                 'reason': reason,
                 'votes': dict(proposal.current_votes),
                 'required_votes': proposal.required_votes,
-                'finalized_at': datetime.now(datetime.UTC).isoformat(),
+                'finalized_at': datetime.now(timezone.utc).isoformat(),
                 'algorithm': self.current_algorithm
             }
             
@@ -283,7 +283,7 @@ class DistributedConsensus:
     async def _cleanup_old_proposals(self):
         """Clean up old and expired proposals"""
         try:
-            current_time = datetime.now(datetime.UTC)
+            current_time = datetime.now(timezone.utc)
             expired_proposals = [
                 pid for pid, proposal in self.proposals.items()
                 if proposal.deadline < current_time or proposal.status in ['approved', 'rejected', 'expired']
@@ -340,7 +340,7 @@ class DistributedConsensus:
             return {
                 'status': 'success',
                 'algorithm': algorithm,
-                'changed_at': datetime.now(datetime.UTC).isoformat()
+                'changed_at': datetime.now(timezone.utc).isoformat()
             }
             
         except Exception as e:
@@ -400,7 +400,7 @@ class DistributedConsensus:
                 'algorithm_performance': dict(algorithm_stats),
                 'node_participation': node_participation,
                 'active_proposals': len(self.proposals),
-                'last_updated': datetime.now(datetime.UTC).isoformat()
+                'last_updated': datetime.now(timezone.utc).isoformat()
             }
             
         except Exception as e:
@@ -414,13 +414,13 @@ class DistributedConsensus:
                 return {'status': 'error', 'message': 'Node not found'}
             
             self.nodes[node_id].is_active = is_active
-            self.nodes[node_id].last_seen = datetime.now(datetime.UTC)
+            self.nodes[node_id].last_seen = datetime.now(timezone.utc)
             
             return {
                 'status': 'success',
                 'node_id': node_id,
                 'is_active': is_active,
-                'updated_at': datetime.now(datetime.UTC).isoformat()
+                'updated_at': datetime.now(timezone.utc).isoformat()
             }
             
         except Exception as e:

apps/agent-coordinator/src/app/exceptions.py

@@ -1,4 +1,4 @@
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 
 from aitbc import get_logger
 from fastapi.responses import JSONResponse
@@ -14,7 +14,7 @@ def register_exception_handlers(app):
             content={
                 "status": "error",
                 "message": "Resource not found",
-                "timestamp": datetime.now(datetime.UTC).isoformat(),
+                "timestamp": datetime.now(timezone.utc).isoformat(),
             },
         )
 
@@ -26,6 +26,6 @@ def register_exception_handlers(app):
             content={
                 "status": "error",
                 "message": "Internal server error",
-                "timestamp": datetime.now(datetime.UTC).isoformat(),
+                "timestamp": datetime.now(timezone.utc).isoformat(),
             },
         )

apps/agent-coordinator/src/app/monitoring/alerting.py

@@ -5,7 +5,7 @@ Implements comprehensive alerting with multiple channels and SLA monitoring
 
 import asyncio
 import smtplib
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Dict, List, Any, Optional, Callable
 from dataclasses import dataclass, field
 from enum import Enum
@@ -134,7 +134,7 @@ class SLAMonitor:
             return
         
         if timestamp is None:
-            timestamp = datetime.now(datetime.UTC)
+            timestamp = datetime.now(timezone.utc)
         
         rule = self.sla_rules[sla_id]
         
@@ -188,7 +188,7 @@ class SLAMonitor:
         # Get recent violations
         recent_violations = [
             v for v in self.violations[sla_id]
-            if v["timestamp"] > datetime.now(datetime.UTC) - timedelta(hours=24)
+            if v["timestamp"] > datetime.now(timezone.utc) - timedelta(hours=24)
         ]
         
         return {
@@ -375,7 +375,7 @@ Annotations: {json.dumps(alert.annotations, indent=2)}
                 payload = {
                     "alert": alert.to_dict(),
                     "message": message,
-                    "timestamp": datetime.now(datetime.UTC).isoformat()
+                    "timestamp": datetime.now(timezone.utc).isoformat()
                 }
                 
                 response = requests.post(
@@ -499,7 +499,7 @@ class AlertManager:
             
             try:
                 condition_met = self._evaluate_condition(rule.condition, metrics, rule.threshold)
-                current_time = datetime.now(datetime.UTC)
+                current_time = datetime.now(timezone.utc)
                 
                 if condition_met:
                     # Check if condition has been met for required duration
@@ -543,7 +543,7 @@ class AlertManager:
     
     def _trigger_alert(self, rule: AlertRule, metrics: Dict[str, Any]):
         """Trigger an alert"""
-        alert_id = f"{rule.rule_id}_{int(datetime.now(datetime.UTC).timestamp())}"
+        alert_id = f"{rule.rule_id}_{int(datetime.now(timezone.utc).timestamp())}"
         
         # Check if similar alert is already active
         existing_alert = self._find_similar_active_alert(rule)
@@ -556,8 +556,8 @@ class AlertManager:
             description=rule.description,
             severity=rule.severity,
             status=AlertStatus.ACTIVE,
-            created_at=datetime.now(datetime.UTC),
-            updated_at=datetime.now(datetime.UTC),
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc),
             labels=rule.labels.copy(),
             annotations=rule.annotations.copy()
         )
@@ -607,8 +607,8 @@ class AlertManager:
         
         alert = self.alerts[alert_id]
         alert.status = AlertStatus.RESOLVED
-        alert.resolved_at = datetime.now(datetime.UTC)
-        alert.updated_at = datetime.now(datetime.UTC)
+        alert.resolved_at = datetime.now(timezone.utc)
+        alert.updated_at = datetime.now(timezone.utc)
         
         return {"status": "success", "alert": alert.to_dict()}
     

apps/agent-coordinator/src/app/protocols/communication.py

@@ -7,7 +7,7 @@ import json
 from enum import Enum
 from typing import Dict, List, Optional, Any, Callable
 from dataclasses import dataclass, field
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 import uuid
 from pydantic import BaseModel, Field
 
@@ -43,7 +43,7 @@ class AgentMessage:
     receiver_id: Optional[str] = None
     message_type: MessageType = MessageType.DIRECT
     priority: Priority = Priority.NORMAL
-    timestamp: datetime = field(default_factory=datetime.now(datetime.UTC))
+    timestamp: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
     payload: Dict[str, Any] = field(default_factory=dict)
     correlation_id: Optional[str] = None
     reply_to: Optional[str] = None
@@ -123,7 +123,7 @@ class CommunicationProtocol:
     
     def _is_message_expired(self, message: AgentMessage) -> bool:
         """Check if message has expired"""
-        age = (datetime.now(datetime.UTC) - message.timestamp).total_seconds()
+        age = (datetime.now(timezone.utc) - message.timestamp).total_seconds()
         return age > message.ttl
     
     async def _send_to_agent(self, message: AgentMessage):
@@ -283,7 +283,7 @@ class MessageTemplates:
             sender_id=sender_id,
             message_type=MessageType.HEARTBEAT,
             priority=Priority.LOW,
-            payload={"timestamp": datetime.now(datetime.UTC).isoformat()}
+            payload={"timestamp": datetime.now(timezone.utc).isoformat()}
         )
     
     @staticmethod

apps/agent-coordinator/src/app/protocols/message_types.py

@@ -7,7 +7,7 @@ import json
 from enum import Enum
 from typing import Dict, List, Optional, Any, Callable, Union
 from dataclasses import dataclass, field
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 import uuid
 import hashlib
 from pydantic import BaseModel, Field, validator
@@ -52,7 +52,7 @@ class RoutingRule:
     target: Optional[str] = None
     priority: int = 0
     enabled: bool = True
-    created_at: datetime = field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
     
     def matches(self, message: AgentMessage) -> bool:
         """Check if message matches routing rule conditions"""
@@ -72,12 +72,12 @@ class TaskMessage(BaseModel):
     priority: Priority = Field(Priority.NORMAL, description="Task priority")
     assigned_agent: Optional[str] = Field(None, description="Assigned agent ID")
     status: str = Field("pending", description="Task status")
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     
     @validator('deadline')
     def validate_deadline(cls, v):
-        if v and v < datetime.now(datetime.UTC):
+        if v and v < datetime.now(timezone.utc):
             raise ValueError("Deadline cannot be in the past")
         return v
 
@@ -90,8 +90,8 @@ class CoordinationMessage(BaseModel):
     decision_deadline: Optional[datetime] = Field(None, description="Decision deadline")
     consensus_threshold: float = Field(0.5, description="Consensus threshold")
     status: str = Field("pending", description="Coordination status")
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 class StatusMessage(BaseModel):
     """Status update message structure"""
@@ -101,7 +101,7 @@ class StatusMessage(BaseModel):
     health_score: float = Field(1.0, description="Agent health score")
     load_metrics: Dict[str, float] = Field(default_factory=dict, description="Load metrics")
     capabilities: List[str] = Field(default_factory=list, description="Agent capabilities")
-    timestamp: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 class DiscoveryMessage(BaseModel):
     """Agent discovery message structure"""
@@ -111,7 +111,7 @@ class DiscoveryMessage(BaseModel):
     services: List[str] = Field(default_factory=list, description="Available services")
     endpoints: Dict[str, str] = Field(default_factory=dict, description="Service endpoints")
     metadata: Dict[str, Any] = Field(default_factory=dict, description="Additional metadata")
-    timestamp: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 class ConsensusMessage(BaseModel):
     """Consensus message structure"""
@@ -122,8 +122,8 @@ class ConsensusMessage(BaseModel):
     voting_deadline: datetime = Field(..., description="Voting deadline")
     consensus_algorithm: str = Field("majority", description="Consensus algorithm")
     status: str = Field("pending", description="Consensus status")
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 class MessageRouter:
     """Advanced message routing system"""
@@ -156,7 +156,7 @@ class MessageRouter:
     
     async def route_message(self, message: AgentMessage) -> Optional[str]:
         """Route message based on routing rules"""
-        start_time = datetime.now(datetime.UTC)
+        start_time = datetime.now(timezone.utc)
         
         try:
             # Check if message is expired
@@ -192,7 +192,7 @@ class MessageRouter:
             self.routing_stats["messages_failed"] += 1
             return None
         finally:
-            routing_time = (datetime.now(datetime.UTC) - start_time).total_seconds()
+            routing_time = (datetime.now(timezone.utc) - start_time).total_seconds()
             self.routing_stats["routing_time_total"] += routing_time
     
     async def _apply_routing_rule(self, rule: RoutingRule, message: AgentMessage) -> Optional[str]:
@@ -244,7 +244,7 @@ class MessageRouter:
     
     def _is_message_expired(self, message: AgentMessage) -> bool:
         """Check if message is expired"""
-        age = (datetime.now(datetime.UTC) - message.timestamp).total_seconds()
+        age = (datetime.now(timezone.utc) - message.timestamp).total_seconds()
         return age > message.ttl
     
     async def get_routing_stats(self) -> Dict[str, Any]:
@@ -269,12 +269,12 @@ class LoadBalancer:
     def __init__(self):
         self.agent_loads: Dict[str, float] = {}
         self.agent_weights: Dict[str, float] = {}
-        self.last_updated = datetime.now(datetime.UTC)
+        self.last_updated = datetime.now(timezone.utc)
         
     def update_agent_load(self, agent_id: str, load: float):
         """Update agent load information"""
         self.agent_loads[agent_id] = load
-        self.last_updated = datetime.now(datetime.UTC)
+        self.last_updated = datetime.now(timezone.utc)
     
     def set_agent_weight(self, agent_id: str, weight: float):
         """Set agent weight for load balancing"""
@@ -421,7 +421,7 @@ class MessageProcessor:
     
     async def process_message(self, message: AgentMessage) -> bool:
         """Process a message"""
-        start_time = datetime.now(datetime.UTC)
+        start_time = datetime.now(timezone.utc)
         
         try:
             # Route message
@@ -440,7 +440,7 @@ class MessageProcessor:
             
             # Update stats
             self.processing_stats["messages_processed"] += 1
-            processing_time = (datetime.now(datetime.UTC) - start_time).total_seconds()
+            processing_time = (datetime.now(timezone.utc) - start_time).total_seconds()
             self.processing_stats["processing_time_total"] += processing_time
             
             return True

apps/agent-coordinator/src/app/routers/agents.py

@@ -1,4 +1,4 @@
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional
 
 from aitbc import get_logger
@@ -52,7 +52,7 @@ async def register_agent(request: AgentRegistrationRequest):
                 "status": "success",
                 "message": f"Agent {request.agent_id} registered successfully",
                 "agent_id": request.agent_id,
-                "registered_at": datetime.now(datetime.UTC).isoformat()
+                "registered_at": datetime.now(timezone.utc).isoformat()
             }
         else:
             raise HTTPException(status_code=500, detail="Failed to register agent")
@@ -78,7 +78,7 @@ async def discover_agents(query: Dict[str, Any]):
             "query": query,
             "agents": [agent.to_dict() for agent in agents],
             "count": len(agents),
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
     except Exception as e:
@@ -101,7 +101,7 @@ async def get_agent(agent_id: str):
         return {
             "status": "success",
             "agent": agent.to_dict(),
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
     except HTTPException:
@@ -132,7 +132,7 @@ async def update_agent_status(agent_id: str, request: AgentStatusUpdate):
                 "message": f"Agent {agent_id} status updated",
                 "agent_id": agent_id,
                 "new_status": request.status,
-                "updated_at": datetime.now(datetime.UTC).isoformat()
+                "updated_at": datetime.now(timezone.utc).isoformat()
             }
         else:
             raise HTTPException(status_code=500, detail="Failed to update agent status")

apps/agent-coordinator/src/app/routers/ai.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional
 
 from aitbc import get_logger

apps/agent-coordinator/src/app/routers/alerts.py

@@ -1,4 +1,4 @@
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional
 
 from aitbc import get_logger
@@ -156,7 +156,7 @@ async def record_sla_metric(
             "status": "success",
             "message": f"SLA metric recorded for {sla_id}",
             "value": value,
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
     except HTTPException:
@@ -206,7 +206,7 @@ async def get_system_status(current_user: Dict[str, Any] = Depends(get_current_u
                 "load_balancer": "running" if state.load_balancer else "stopped",
                 "task_distributor": "running" if state.task_distributor else "stopped"
             },
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
         return status

apps/agent-coordinator/src/app/routers/auth.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional
 
 from aitbc import get_logger

apps/agent-coordinator/src/app/routers/consensus.py

@@ -1,4 +1,4 @@
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional
 
 from aitbc import get_logger
@@ -105,7 +105,7 @@ async def get_advanced_features_status():
         
         return {
             "status": "success",
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "features": {
                 "realtime_learning": {
                     "status": "active",

apps/agent-coordinator/src/app/routers/health.py

@@ -1,4 +1,4 @@
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional
 
 from aitbc import get_logger
@@ -30,7 +30,7 @@ async def health_check():
     return {
         "status": "healthy",
         "service": "agent-coordinator",
-        "timestamp": datetime.now(datetime.UTC).isoformat(),
+        "timestamp": datetime.now(timezone.utc).isoformat(),
         "version": "1.0.0"
     }
 

apps/agent-coordinator/src/app/routers/messages.py

@@ -1,4 +1,4 @@
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional
 
 from aitbc import get_logger
@@ -63,7 +63,7 @@ async def send_message(request: MessageRequest):
                 "message": "Message sent successfully",
                 "message_id": message.id,
                 "receiver_id": request.receiver_id,
-                "sent_at": datetime.now(datetime.UTC).isoformat()
+                "sent_at": datetime.now(timezone.utc).isoformat()
             }
         else:
             raise HTTPException(status_code=500, detail="Failed to send message")
@@ -85,7 +85,7 @@ async def get_load_balancer_stats():
         return {
             "status": "success",
             "stats": stats,
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
     except Exception as e:
@@ -105,7 +105,7 @@ async def get_registry_stats():
         return {
             "status": "success",
             "stats": stats,
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
     except Exception as e:
@@ -127,7 +127,7 @@ async def get_agents_by_service(service: str):
             "service": service,
             "agents": [agent.to_dict() for agent in agents],
             "count": len(agents),
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
     except Exception as e:
@@ -149,7 +149,7 @@ async def get_agents_by_capability(capability: str):
             "capability": capability,
             "agents": [agent.to_dict() for agent in agents],
             "count": len(agents),
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
     except Exception as e:
@@ -175,7 +175,7 @@ async def set_load_balancing_strategy(strategy: str = Query(..., description="Lo
             "status": "success",
             "message": f"Load balancing strategy set to {strategy}",
             "strategy": strategy,
-            "updated_at": datetime.now(datetime.UTC).isoformat()
+            "updated_at": datetime.now(timezone.utc).isoformat()
         }
         
     except HTTPException:

apps/agent-coordinator/src/app/routers/monitoring.py

@@ -1,4 +1,4 @@
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional
 
 from aitbc import get_logger
@@ -84,7 +84,7 @@ async def get_metrics_summary():
             "status": "success",
             "performance": summary,
             "system": system_metrics,
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
     except Exception as e:
@@ -116,7 +116,7 @@ async def get_health_metrics():
                 "count": psutil.cpu_count()
             },
             "uptime": performance_monitor.get_performance_summary()["uptime_seconds"],
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
         return {

apps/agent-coordinator/src/app/routers/tasks.py

@@ -1,4 +1,4 @@
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 import uuid
 from typing import Any, Dict, List, Optional
 
@@ -50,7 +50,7 @@ async def submit_task(request: TaskSubmission, background_tasks: BackgroundTasks
             "message": "Task submitted successfully",
             "task_id": request.task_data.get("task_id", str(uuid.uuid4())),
             "priority": request.priority,
-            "submitted_at": datetime.now(datetime.UTC).isoformat()
+            "submitted_at": datetime.now(timezone.utc).isoformat()
         }
         
     except HTTPException:
@@ -72,7 +72,7 @@ async def get_task_status():
         return {
             "status": "success",
             "stats": stats,
-            "timestamp": datetime.now(datetime.UTC).isoformat()
+            "timestamp": datetime.now(timezone.utc).isoformat()
         }
         
     except Exception as e:

apps/agent-coordinator/src/app/routers/users.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timezone
 from typing import Any, Dict, List, Optional
 
 from aitbc import get_logger

apps/agent-coordinator/src/app/routing/agent_discovery.py

@@ -8,7 +8,7 @@ import asyncio
 import json
 from typing import Dict, List, Optional, Set, Callable, Any
 from dataclasses import dataclass, field
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 import uuid
 import hashlib
 from enum import Enum
@@ -178,7 +178,7 @@ class AgentRegistry:
             
             agent_info = self.agents[agent_id]
             agent_info.status = status
-            agent_info.last_heartbeat = datetime.now(datetime.UTC)
+            agent_info.last_heartbeat = datetime.now(timezone.utc)
             
             if load_metrics:
                 agent_info.load_metrics.update(load_metrics)
@@ -206,7 +206,7 @@ class AgentRegistry:
                 return False
             
             agent_info = self.agents[agent_id]
-            agent_info.last_heartbeat = datetime.now(datetime.UTC)
+            agent_info.last_heartbeat = datetime.now(timezone.utc)
             
             # Update health score
             agent_info.health_score = self._calculate_health_score(agent_info)
@@ -307,7 +307,7 @@ class AgentRegistry:
             "type_counts": type_counts,
             "service_count": len(self.service_index),
             "capability_count": len(self.capability_index),
-            "last_cleanup": datetime.now(datetime.UTC).isoformat()
+            "last_cleanup": datetime.now(timezone.utc).isoformat()
         }
     
     def _update_indexes(self, agent_info: AgentInfo):
@@ -372,7 +372,7 @@ class AgentRegistry:
             base_score -= 0.1
         
         # Penalty for old heartbeat
-        heartbeat_age = (datetime.now(datetime.UTC) - agent_info.last_heartbeat).total_seconds()
+        heartbeat_age = (datetime.now(timezone.utc) - agent_info.last_heartbeat).total_seconds()
         if heartbeat_age > self.max_heartbeat_age:
             base_score -= 0.5
         elif heartbeat_age > self.max_heartbeat_age / 2:
@@ -428,7 +428,7 @@ class AgentRegistry:
         
         event = {
             "event_type": event_type,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "agent_info": agent_info.to_dict()
         }
         
@@ -441,7 +441,7 @@ class AgentRegistry:
                 await asyncio.sleep(self.heartbeat_interval)
                 
                 # Check for agents with old heartbeats
-                now = datetime.now(datetime.UTC)
+                now = datetime.now(timezone.utc)
                 for agent_id, agent_info in list(self.agents.items()):
                     heartbeat_age = (now - agent_info.last_heartbeat).total_seconds()
                     
@@ -462,7 +462,7 @@ class AgentRegistry:
                 await asyncio.sleep(self.cleanup_interval)
                 
                 # Remove agents that have been inactive too long
-                now = datetime.now(datetime.UTC)
+                now = datetime.now(timezone.utc)
                 max_inactive_age = timedelta(hours=1)  # 1 hour
                 
                 for agent_id, agent_info in list(self.agents.items()):
@@ -502,8 +502,8 @@ class AgentDiscoveryService:
                 services=discovery_data.services,
                 endpoints=discovery_data.endpoints,
                 metadata=discovery_data.metadata,
-                last_heartbeat=datetime.now(datetime.UTC),
-                registration_time=datetime.now(datetime.UTC)
+                last_heartbeat=datetime.now(timezone.utc),
+                registration_time=datetime.now(timezone.utc)
             )
             
             # Register or update agent
@@ -597,8 +597,8 @@ def create_agent_info(agent_id: str, agent_type: str, capabilities: List[str], s
         services=services,
         endpoints=endpoints,
         metadata={},
-        last_heartbeat=datetime.now(datetime.UTC),
-        registration_time=datetime.now(datetime.UTC)
+        last_heartbeat=datetime.now(timezone.utc),
+        registration_time=datetime.now(timezone.utc)
     )
 
 # Example usage

apps/agent-coordinator/src/app/routing/load_balancer.py

@@ -6,7 +6,7 @@ import asyncio
 import json
 from typing import Dict, List, Optional, Tuple, Any, Callable
 from dataclasses import dataclass, field
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from enum import Enum
 import statistics
 import uuid
@@ -48,7 +48,7 @@ class LoadMetrics:
     completed_tasks: int = 0
     failed_tasks: int = 0
     avg_response_time: float = 0.0
-    last_updated: datetime = field(default_factory=datetime.now(datetime.UTC))
+    last_updated: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
     
     def to_dict(self) -> Dict[str, Any]:
         return {
@@ -94,7 +94,7 @@ class AgentWeight:
     capacity: int = 100
     performance_score: float = 1.0
     reliability_score: float = 1.0
-    last_updated: datetime = field(default_factory=datetime.now(datetime.UTC))
+    last_updated: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
 
 class LoadBalancer:
     """Advanced load balancer for agent distribution"""
@@ -132,7 +132,7 @@ class LoadBalancer:
     def update_agent_metrics(self, agent_id: str, metrics: LoadMetrics):
         """Update agent load metrics"""
         self.agent_metrics[agent_id] = metrics
-        self.agent_metrics[agent_id].last_updated = datetime.now(datetime.UTC)
+        self.agent_metrics[agent_id].last_updated = datetime.now(timezone.utc)
         
         # Update performance score based on metrics
         self._update_performance_score(agent_id, metrics)
@@ -196,7 +196,7 @@ class LoadBalancer:
             assignment = TaskAssignment(
                 task_id=task_id,
                 agent_id=selected_agent,
-                assigned_at=datetime.now(datetime.UTC)
+                assigned_at=datetime.now(timezone.utc)
             )
             
             # Record assignment
@@ -226,7 +226,7 @@ class LoadBalancer:
                 return
             
             assignment = self.task_assignments[task_id]
-            assignment.completed_at = datetime.now(datetime.UTC)
+            assignment.completed_at = datetime.now(timezone.utc)
             assignment.status = "completed"
             assignment.success = success
             assignment.response_time = response_time
@@ -580,7 +580,7 @@ class TaskDistributor:
             "task_data": task_data,
             "priority": priority,
             "requirements": requirements,
-            "submitted_at": datetime.now(datetime.UTC)
+            "submitted_at": datetime.now(timezone.utc)
         }
         
         await self.priority_queues[priority].put(task_info)
@@ -612,7 +612,7 @@ class TaskDistributor:
     
     async def _distribute_task(self, task_info: Dict[str, Any]):
         """Distribute a single task"""
-        start_time = datetime.now(datetime.UTC)
+        start_time = datetime.now(timezone.utc)
         
         try:
             # Assign task
@@ -648,7 +648,7 @@ class TaskDistributor:
         
         finally:
             # Update distribution time
-            distribution_time = (datetime.now(datetime.UTC) - start_time).total_seconds()
+            distribution_time = (datetime.now(timezone.utc) - start_time).total_seconds()
             total_distributed = self.distribution_stats["tasks_distributed"]
             self.distribution_stats["avg_distribution_time"] = (
                 (self.distribution_stats["avg_distribution_time"] * (total_distributed - 1) + distribution_time) / total_distributed

apps/agent-coordinator/tests/test_communication.py

@@ -5,7 +5,7 @@ Tests for Agent Communication Protocols
 import sys
 import pytest
 import asyncio
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from unittest.mock import Mock, AsyncMock
 
 from src.app.protocols.communication import (
@@ -63,12 +63,12 @@ class TestAgentMessage:
             sender_id="agent-001",
             receiver_id="agent-002",
             message_type=MessageType.DIRECT,
-            timestamp=datetime.now(datetime.UTC) - timedelta(seconds=400),
+            timestamp=datetime.now(timezone.utc) - timedelta(seconds=400),
             ttl=300
         )
         
         # Message should be expired
-        age = (datetime.now(datetime.UTC) - old_message.timestamp).total_seconds()
+        age = (datetime.now(timezone.utc) - old_message.timestamp).total_seconds()
         assert age > old_message.ttl
 
 class TestHierarchicalProtocol:

apps/blockchain-node/src/aitbc_chain/consensus/poa.py

@@ -2,7 +2,7 @@ import asyncio
 import hashlib
 import json
 import re
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from pathlib import Path
 from typing import Callable, ContextManager, Optional
 
@@ -168,8 +168,10 @@ class PoAProposer:
         head = self._fetch_chain_head()
         if head is None:
             return
-        now = datetime.now(datetime.UTC)
-        elapsed = (now - head.timestamp).total_seconds()
+        now = datetime.now(timezone.utc)
+        # Ensure head.timestamp is timezone-aware
+        head_timestamp = head.timestamp if head.timestamp.tzinfo is not None else head.timestamp.replace(tzinfo=timezone.utc)
+        elapsed = (now - head_timestamp).total_seconds()
         sleep_for = max(self._config.interval_seconds - elapsed, 0.1)
         if sleep_for <= 0:
             sleep_for = 0.1
@@ -201,7 +203,9 @@ class PoAProposer:
             elif block_generation_mode == "hybrid":
                 # Hybrid mode: check heartbeat interval
                 if self._last_block_timestamp:
-                    time_since_last_block = (datetime.now(datetime.UTC) - self._last_block_timestamp).total_seconds()
+                    # Ensure last_block_timestamp is timezone-aware
+                    last_timestamp = self._last_block_timestamp if self._last_block_timestamp.tzinfo is not None else self._last_block_timestamp.replace(tzinfo=timezone.utc)
+                    time_since_last_block = (datetime.now(timezone.utc) - last_timestamp).total_seconds()
                     if mempool_size == 0 and time_since_last_block < max_empty_block_interval:
                         self._logger.debug(f"[PROPOSE] Skipping block proposal: mempool empty, heartbeat not yet due (chain={self._config.chain_id}, mode=hybrid, idle_time={time_since_last_block:.1f}s)")
                         metrics_registry.increment("sync_empty_blocks_skipped_total")
@@ -224,9 +228,11 @@ class PoAProposer:
             if head is not None:
                 next_height = head.height + 1
                 parent_hash = head.hash
-                interval_seconds = (datetime.now(datetime.UTC) - head.timestamp).total_seconds()
+                # Ensure head.timestamp is timezone-aware
+                head_timestamp = head.timestamp if head.timestamp.tzinfo is not None else head.timestamp.replace(tzinfo=timezone.utc)
+                interval_seconds = (datetime.now(timezone.utc) - head_timestamp).total_seconds()
 
-            timestamp = datetime.now(datetime.UTC)
+            timestamp = datetime.now(timezone.utc)
             
             # Pull transactions from mempool
             max_txs = self._config.max_txs_per_block

apps/blockchain-node/src/aitbc_chain/logger.py

@@ -2,12 +2,12 @@ import logging
 import sys
 from logging.handlers import RotatingFileHandler
 import json
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 
 class JsonFormatter(logging.Formatter):
     def format(self, record):
         log_record = {
-            "timestamp": datetime.now(datetime.UTC).isoformat() + "Z",
+            "timestamp": datetime.now(timezone.utc).isoformat() + "Z",
             "level": record.levelname,
             "logger": record.name,
             "message": record.getMessage()

apps/blockchain-node/src/aitbc_chain/models.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timezone
 import re
 from typing import List, Optional
 
@@ -33,7 +33,7 @@ class Block(SQLModel, table=True):
     hash: str = Field(index=True, unique=True)
     parent_hash: str
     proposer: str
-    timestamp: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    timestamp: datetime = Field(default_factory=datetime.now(timezone.utc), index=True)
     tx_count: int = 0
     state_root: Optional[str] = None
     block_metadata: Optional[str] = Field(default=None)
@@ -89,7 +89,7 @@ class Transaction(SQLModel, table=True):
         default_factory=dict,
         sa_column=Column(JSON, nullable=False),
     )
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    created_at: datetime = Field(default_factory=datetime.now(timezone.utc), index=True)
     
     # New fields added to schema
     nonce: int = Field(default=0)
@@ -140,7 +140,7 @@ class Receipt(SQLModel, table=True):
         sa_column=Column(JSON, nullable=False),
     )
     minted_amount: Optional[int] = None
-    recorded_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    recorded_at: datetime = Field(default_factory=datetime.now(timezone.utc), index=True)
     status: str = Field(default="pending", index=True)  # pending, claimed, invalid
     claimed_at: Optional[datetime] = None
     claimed_by: Optional[str] = None
@@ -168,7 +168,7 @@ class Account(SQLModel, table=True):
     address: str = Field(primary_key=True)
     balance: int = 0
     nonce: int = 0
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    updated_at: datetime = Field(default_factory=datetime.now(timezone.utc))
 
 class Escrow(SQLModel, table=True):
     __tablename__ = "escrow"
@@ -177,5 +177,5 @@ class Escrow(SQLModel, table=True):
     buyer: str = Field(foreign_key="account.address")
     provider: str = Field(foreign_key="account.address")
     amount: int
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=datetime.now(timezone.utc))
     released_at: Optional[datetime] = None

apps/coordinator-api/src/app/domain/agent.py

@@ -3,7 +3,7 @@ AI Agent Domain Models for Verifiable AI Agent Orchestration
 Implements SQLModel definitions for agent workflows, steps, and execution tracking
 """
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -68,8 +68,8 @@ class AIAgentWorkflow(SQLModel, table=True):
     is_public: bool = Field(default=False)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class AgentStep(SQLModel, table=True):
@@ -102,8 +102,8 @@ class AgentStep(SQLModel, table=True):
     depends_on: str = Field(default="")  # JSON string of step IDs
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class AgentExecution(SQLModel, table=True):
@@ -141,8 +141,8 @@ class AgentExecution(SQLModel, table=True):
     completed_steps: int = Field(default=0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class AgentStepExecution(SQLModel, table=True):
@@ -180,8 +180,8 @@ class AgentStepExecution(SQLModel, table=True):
     completed_at: datetime | None = Field(default=None)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class AgentMarketplace(SQLModel, table=True):
@@ -219,8 +219,8 @@ class AgentMarketplace(SQLModel, table=True):
     last_execution_at: datetime | None = Field(default=None)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 # Request/Response Models for API

apps/coordinator-api/src/app/domain/agent_identity.py

@@ -3,7 +3,7 @@ Agent Identity Domain Models for Cross-Chain Agent Identity Management
 Implements SQLModel definitions for unified agent identity across multiple blockchains
 """
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -80,8 +80,8 @@ class AgentIdentity(SQLModel, table=True):
     tags: list[str] = Field(default_factory=list, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Indexes for performance
     __table_args__ = {
@@ -122,8 +122,8 @@ class CrossChainMapping(SQLModel, table=True):
     transaction_count: int = Field(default=0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Unique constraint
     __table_args__ = {
@@ -162,8 +162,8 @@ class IdentityVerification(SQLModel, table=True):
     verification_meta_data: dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Indexes
     __table_args__ = {
@@ -208,8 +208,8 @@ class AgentWallet(SQLModel, table=True):
     transaction_count: int = Field(default=0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Indexes
     __table_args__ = {

apps/coordinator-api/src/app/domain/agent_performance.py

@@ -3,7 +3,7 @@ Advanced Agent Performance Domain Models
 Implements SQLModel definitions for meta-learning, resource management, and performance optimization
 """
 
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -102,8 +102,8 @@ class AgentPerformanceProfile(SQLModel, table=True):
     percentile_rank: float | None = None
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_assessed: datetime | None = None
 
     # Additional data
@@ -152,8 +152,8 @@ class MetaLearningModel(SQLModel, table=True):
     success_rate: float = Field(default=0.0, ge=0, le=1.0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     trained_at: datetime | None = None
     deployed_at: datetime | None = None
 
@@ -205,8 +205,8 @@ class ResourceAllocation(SQLModel, table=True):
     performance_improvement: float = Field(default=0.0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional data
     allocation_profile_meta_data: dict[str, Any] = Field(default={}, sa_column=Column(JSON))
@@ -259,8 +259,8 @@ class PerformanceOptimization(SQLModel, table=True):
     rollback_available: bool = Field(default=True)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     completed_at: datetime | None = None
 
     # Additional data
@@ -304,7 +304,7 @@ class AgentCapability(SQLModel, table=True):
     tool_proficiency: dict[str, float] = Field(default={}, sa_column=Column(JSON))
 
     # Development history
-    acquired_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    acquired_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_improved: datetime | None = None
     improvement_count: int = Field(default=0)
 
@@ -314,8 +314,8 @@ class AgentCapability(SQLModel, table=True):
     last_validated: datetime | None = None
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional data
     capability_profile_meta_data: dict[str, Any] = Field(default={}, sa_column=Column(JSON))
@@ -365,8 +365,8 @@ class FusionModel(SQLModel, table=True):
     performance_stability: float = Field(default=0.0, ge=0, le=1.0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     trained_at: datetime | None = None
     deployed_at: datetime | None = None
 
@@ -420,8 +420,8 @@ class ReinforcementLearningConfig(SQLModel, table=True):
     deployment_performance: dict[str, float] = Field(default={}, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     trained_at: datetime | None = None
     deployed_at: datetime | None = None
 
@@ -476,8 +476,8 @@ class CreativeCapability(SQLModel, table=True):
     last_evaluation: datetime | None = None
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional data
     creative_profile_meta_data: dict[str, Any] = Field(default={}, sa_column=Column(JSON))

apps/coordinator-api/src/app/domain/agent_portfolio.py

@@ -6,7 +6,7 @@ Domain models for agent portfolio management, trading strategies, and risk asses
 
 from __future__ import annotations
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from enum import StrEnum
 
 from sqlalchemy import JSON, Column
@@ -47,8 +47,8 @@ class PortfolioStrategy(SQLModel, table=True):
     rebalance_frequency: int = Field(default=86400)  # Rebalancing frequency in seconds
     volatility_threshold: float = Field(default=15.0)  # Volatility threshold for rebalancing
     is_active: bool = Field(default=True, index=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     portfolios: List["AgentPortfolio"] = Relationship(back_populates="strategy")
@@ -68,9 +68,9 @@ class AgentPortfolio(SQLModel, table=True):
     risk_score: float = Field(default=0.0)  # Risk score (0-100)
     risk_tolerance: float = Field(default=50.0)  # Risk tolerance percentage
     is_active: bool = Field(default=True, index=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    last_rebalance: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    last_rebalance: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     strategy: PortfolioStrategy = Relationship(back_populates="portfolios")
@@ -93,8 +93,8 @@ class PortfolioAsset(SQLModel, table=True):
     current_allocation: float = Field(default=0.0)  # Current allocation percentage
     average_cost: float = Field(default=0.0)  # Average cost basis
     unrealized_pnl: float = Field(default=0.0)  # Unrealized profit/loss
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     portfolio: AgentPortfolio = Relationship(back_populates="assets")
@@ -116,7 +116,7 @@ class PortfolioTrade(SQLModel, table=True):
     status: TradeStatus = Field(default=TradeStatus.PENDING, index=True)
     transaction_hash: str | None = Field(default=None, index=True)
     executed_at: datetime | None = Field(default=None, index=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
 
     # Relationships
     # DISABLED:     portfolio: AgentPortfolio = Relationship(back_populates="trades")
@@ -140,7 +140,7 @@ class RiskMetrics(SQLModel, table=True):
     risk_level: RiskLevel = Field(default=RiskLevel.LOW, index=True)
     overall_risk_score: float = Field(default=0.0)  # Overall risk score (0-100)
     stress_test_results: dict[str, float] = Field(default_factory=dict, sa_column=Column(JSON))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     portfolio: AgentPortfolio = Relationship(back_populates="risk_metrics")
@@ -159,7 +159,7 @@ class RebalanceHistory(SQLModel, table=True):
     trades_executed: int = Field(default=0)
     rebalance_cost: float = Field(default=0.0)  # Cost of rebalancing
     execution_time_ms: int = Field(default=0)  # Execution time in milliseconds
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
 
 
 class PerformanceMetrics(SQLModel, table=True):
@@ -184,9 +184,9 @@ class PerformanceMetrics(SQLModel, table=True):
     beta: float = Field(default=0.0)  # Beta vs benchmark
     tracking_error: float = Field(default=0.0)  # Tracking error
     information_ratio: float = Field(default=0.0)  # Information ratio
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    period_start: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    period_end: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    period_start: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    period_end: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class PortfolioAlert(SQLModel, table=True):
@@ -202,7 +202,7 @@ class PortfolioAlert(SQLModel, table=True):
     meta_data: dict[str, str] = Field(default_factory=dict, sa_column=Column(JSON))
     is_acknowledged: bool = Field(default=False, index=True)
     acknowledged_at: datetime | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
     resolved_at: datetime | None = Field(default=None)
 
 
@@ -223,8 +223,8 @@ class StrategySignal(SQLModel, table=True):
     meta_data: dict[str, str] = Field(default_factory=dict, sa_column=Column(JSON))
     is_executed: bool = Field(default=False, index=True)
     executed_at: datetime | None = Field(default=None)
-    expires_at: datetime = Field(default_factory=lambda: datetime.now(datetime.UTC) + timedelta(hours=24))
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    expires_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc) + timedelta(hours=24))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
 
 
 class PortfolioSnapshot(SQLModel, table=True):
@@ -243,7 +243,7 @@ class PortfolioSnapshot(SQLModel, table=True):
     geographic_allocation: dict[str, float] = Field(default_factory=dict, sa_column=Column(JSON))
     risk_metrics: dict[str, float] = Field(default_factory=dict, sa_column=Column(JSON))
     performance_metrics: dict[str, float] = Field(default_factory=dict, sa_column=Column(JSON))
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class TradingRule(SQLModel, table=True):
@@ -258,8 +258,8 @@ class TradingRule(SQLModel, table=True):
     parameters: dict[str, str] = Field(default_factory=dict, sa_column=Column(JSON))
     is_active: bool = Field(default=True, index=True)
     priority: int = Field(default=0)  # Rule priority (higher = more important)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class MarketCondition(SQLModel, table=True):
@@ -277,5 +277,5 @@ class MarketCondition(SQLModel, table=True):
     trend_strength: float = Field(default=0.0)  # Trend strength
     support_level: float = Field(default=0.0)  # Support level
     resistance_level: float = Field(default=0.0)  # Resistance level
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    expires_at: datetime = Field(default_factory=lambda: datetime.now(datetime.UTC) + timedelta(hours=24))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    expires_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc) + timedelta(hours=24))

apps/coordinator-api/src/app/domain/amm.py

@@ -6,7 +6,7 @@ Domain models for automated market making, liquidity pools, and swap transaction
 
 from __future__ import annotations
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from enum import StrEnum
 
 from sqlalchemy import JSON, Column
@@ -59,8 +59,8 @@ class LiquidityPool(SQLModel, table=True):
     is_active: bool = Field(default=True, index=True)
     status: PoolStatus = Field(default=PoolStatus.ACTIVE, index=True)
     created_by: str = Field(index=True)  # Creator address
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_trade_time: datetime | None = Field(default=None)
 
     # Relationships
@@ -88,8 +88,8 @@ class LiquidityPosition(SQLModel, table=True):
     fees_earned: float = Field(default=0.0)  # Fees earned
     impermanent_loss: float = Field(default=0.0)  # Impermanent loss
     status: LiquidityPositionStatus = Field(default=LiquidityPositionStatus.ACTIVE, index=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_deposit: datetime | None = Field(default=None)
     last_withdrawal: datetime | None = Field(default=None)
 
@@ -121,8 +121,8 @@ class SwapTransaction(SQLModel, table=True):
     gas_used: int | None = Field(default=None)
     gas_price: float | None = Field(default=None)
     executed_at: datetime | None = Field(default=None, index=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    deadline: datetime = Field(default_factory=lambda: datetime.now(datetime.UTC) + timedelta(minutes=20))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    deadline: datetime = Field(default_factory=lambda: datetime.now(timezone.utc) + timedelta(minutes=20))
 
     # Relationships
     # DISABLED:     pool: LiquidityPool = Relationship(back_populates="swaps")
@@ -149,7 +149,7 @@ class PoolMetrics(SQLModel, table=True):
     impermanent_loss_24h: float = Field(default=0.0)  # 24h impermanent loss
     liquidity_provider_count: int = Field(default=0)  # Number of liquidity providers
     top_lps: dict[str, float] = Field(default_factory=dict, sa_column=Column(JSON))  # Top LPs by share
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     pool: LiquidityPool = Relationship(back_populates="metrics")
@@ -168,10 +168,10 @@ class FeeStructure(SQLModel, table=True):
     volume_adjustment: float = Field(default=0.0)  # Volume-based adjustment
     liquidity_adjustment: float = Field(default=0.0)  # Liquidity-based adjustment
     time_adjustment: float = Field(default=0.0)  # Time-based adjustment
-    adjusted_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    expires_at: datetime = Field(default_factory=lambda: datetime.now(datetime.UTC) + timedelta(hours=24))
+    adjusted_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    expires_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc) + timedelta(hours=24))
     adjustment_reason: str = Field(default="")  # Reason for adjustment
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class IncentiveProgram(SQLModel, table=True):
@@ -192,10 +192,10 @@ class IncentiveProgram(SQLModel, table=True):
     maximum_liquidity: float = Field(default=0.0)  # Maximum liquidity cap (0 = no cap)
     vesting_period_days: int = Field(default=0)  # Vesting period (0 = no vesting)
     is_active: bool = Field(default=True, index=True)
-    start_time: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    end_time: datetime = Field(default_factory=lambda: datetime.now(datetime.UTC) + timedelta(days=30))
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    start_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    end_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc) + timedelta(days=30))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     pool: LiquidityPool = Relationship(back_populates="incentives")
@@ -220,7 +220,7 @@ class LiquidityReward(SQLModel, table=True):
     claim_transaction_hash: str | None = Field(default=None)
     vesting_start: datetime | None = Field(default=None)
     vesting_end: datetime | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
 
     # Relationships
     # DISABLED:     program: IncentiveProgram = Relationship(back_populates="rewards")
@@ -243,7 +243,7 @@ class FeeClaim(SQLModel, table=True):
     is_claimed: bool = Field(default=False, index=True)
     claimed_at: datetime | None = Field(default=None)
     claim_transaction_hash: str | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
 
     # Relationships
     # DISABLED:     position: LiquidityPosition = Relationship(back_populates="fee_claims")
@@ -260,8 +260,8 @@ class PoolConfiguration(SQLModel, table=True):
     config_value: str = Field(default="")
     config_type: str = Field(default="string")  # string, number, boolean, json
     is_active: bool = Field(default=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class PoolAlert(SQLModel, table=True):
@@ -283,8 +283,8 @@ class PoolAlert(SQLModel, table=True):
     acknowledged_at: datetime | None = Field(default=None)
     is_resolved: bool = Field(default=False, index=True)
     resolved_at: datetime | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    expires_at: datetime = Field(default_factory=lambda: datetime.now(datetime.UTC) + timedelta(hours=24))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    expires_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc) + timedelta(hours=24))
 
 
 class PoolSnapshot(SQLModel, table=True):
@@ -310,7 +310,7 @@ class PoolSnapshot(SQLModel, table=True):
     average_slippage: float = Field(default=0.0)
     average_price_impact: float = Field(default=0.0)
     impermanent_loss: float = Field(default=0.0)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class ArbitrageOpportunity(SQLModel, table=True):
@@ -335,5 +335,5 @@ class ArbitrageOpportunity(SQLModel, table=True):
     executed_at: datetime | None = Field(default=None)
     execution_tx_hash: str | None = Field(default=None)
     actual_profit: float | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    expires_at: datetime = Field(default_factory=lambda: datetime.now(datetime.UTC) + timedelta(minutes=5))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    expires_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc) + timedelta(minutes=5))

apps/coordinator-api/src/app/domain/analytics.py

@@ -3,7 +3,7 @@ Marketplace Analytics Domain Models
 Implements SQLModel definitions for analytics, insights, and reporting
 """
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -87,7 +87,7 @@ class MarketMetric(SQLModel, table=True):
     metric_meta_data: dict[str, Any] = Field(default={}, sa_column=Column(JSON))
 
     # Timestamps
-    recorded_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    recorded_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     period_start: datetime
     period_end: datetime
 
@@ -134,8 +134,8 @@ class MarketInsight(SQLModel, table=True):
     resolved_at: datetime | None = None
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = None
 
     # Additional data
@@ -184,9 +184,9 @@ class AnalyticsReport(SQLModel, table=True):
     recipients: list[str] = Field(default=[], sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    generated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    generated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     delivered_at: datetime | None = None
 
     # Additional data
@@ -230,8 +230,8 @@ class DashboardConfig(SQLModel, table=True):
     last_modified_by: str | None = None
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_viewed_at: datetime | None = None
 
     # Additional data
@@ -281,8 +281,8 @@ class DataCollectionJob(SQLModel, table=True):
     cpu_usage: float = Field(default=0.0)  # percentage
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional data
     job_metric_meta_data: dict[str, Any] = Field(default={}, sa_column=Column(JSON))
@@ -331,8 +331,8 @@ class AlertRule(SQLModel, table=True):
     trigger_count: int = Field(default=0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional data
     rule_metric_meta_data: dict[str, Any] = Field(default={}, sa_column=Column(JSON))
@@ -383,8 +383,8 @@ class AnalyticsAlert(SQLModel, table=True):
     delivery_status: dict[str, str] = Field(default={}, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = None
 
     # Additional data
@@ -434,8 +434,8 @@ class UserPreference(SQLModel, table=True):
     anonymous_usage: bool = Field(default=False)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_login: datetime | None = None
 
     # Additional preferences

apps/coordinator-api/src/app/domain/atomic_swap.py

@@ -6,7 +6,7 @@ Domain models for managing trustless cross-chain atomic swaps between agents.
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from uuid import uuid4
 
@@ -60,5 +60,5 @@ class AtomicSwapOrder(SQLModel, table=True):
 
     status: SwapStatus = Field(default=SwapStatus.CREATED, index=True)
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))

apps/coordinator-api/src/app/domain/bounty.py

@@ -4,7 +4,7 @@ Database models for AI agent bounty system with ZK-proof verification
 """
 
 import uuid
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from enum import StrEnum
 from typing import Any
 
@@ -70,7 +70,7 @@ class Bounty(SQLModel, table=True):
 
     # Timing
     deadline: datetime = Field(index=True)
-    creation_time: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    creation_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Limits
     max_submissions: int = Field(default=100)
@@ -137,7 +137,7 @@ class BountySubmission(SQLModel, table=True):
     dispute_resolved: bool = Field(default=False)
 
     # Timing
-    submission_time: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    submission_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Metadata
     submission_data: dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON))
@@ -168,13 +168,13 @@ class AgentStake(SQLModel, table=True):
     # Stake details
     amount: float = Field(index=True)
     lock_period: int = Field(default=30)  # days
-    start_time: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    start_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     end_time: datetime
 
     # Status and rewards
     status: StakeStatus = Field(default=StakeStatus.ACTIVE)
     accumulated_rewards: float = Field(default=0.0)
-    last_reward_time: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    last_reward_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # APY and performance
     current_apy: float = Field(default=5.0)  # percentage
@@ -226,7 +226,7 @@ class AgentMetrics(SQLModel, table=True):
     reputation_score: float = Field(default=0.0)
 
     # Timing
-    last_update_time: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    last_update_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     first_submission_time: datetime | None = Field(default=None)
 
     # Additional metrics
@@ -271,7 +271,7 @@ class StakingPool(SQLModel, table=True):
     active_stakers: list[str] = Field(default_factory=list, sa_column=Column(JSON))
 
     # Distribution
-    last_distribution_time: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    last_distribution_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     distribution_frequency: int = Field(default=1)  # days
 
     # Pool configuration
@@ -309,7 +309,7 @@ class BountyIntegration(SQLModel, table=True):
 
     # Status and timing
     status: BountyStatus = Field(default=BountyStatus.CREATED)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     processed_at: datetime | None = Field(default=None)
 
     # Processing information
@@ -393,7 +393,7 @@ class EcosystemMetrics(SQLModel, table=True):
     metrics_id: str = Field(primary_key=True, default_factory=lambda: f"eco_{uuid.uuid4().hex[:8]}")
 
     # Time period
-    timestamp: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
     period_type: str = Field(default="hourly")  # hourly, daily, weekly
 
     # Developer metrics

apps/coordinator-api/src/app/domain/certification.py

@@ -3,7 +3,7 @@ Agent Certification and Partnership Domain Models
 Implements SQLModel definitions for certification, verification, and partnership programs
 """
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -80,7 +80,7 @@ class AgentCertification(SQLModel, table=True):
 
     # Issuance information
     issued_by: str = Field(index=True)  # Who issued the certification
-    issued_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    issued_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = None
     verification_hash: str = Field(max_length=64)  # Blockchain verification hash
 
@@ -142,9 +142,9 @@ class CertificationRequirement(SQLModel, table=True):
     weight: float = Field(default=1.0)  # Importance weight
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    effective_date: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    effective_date: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expiry_date: datetime | None = None
 
     # Additional data
@@ -167,7 +167,7 @@ class VerificationRecord(SQLModel, table=True):
 
     # Request information
     requested_by: str = Field(index=True)
-    requested_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    requested_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     priority: str = Field(default="normal")  # low, normal, high, urgent
 
     # Verification process
@@ -242,8 +242,8 @@ class PartnershipProgram(SQLModel, table=True):
     current_participants: int = Field(default=0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     launched_at: datetime | None = None
     expires_at: datetime | None = None
 
@@ -268,7 +268,7 @@ class AgentPartnership(SQLModel, table=True):
     current_tier: str = Field(default="basic")
 
     # Application and approval
-    applied_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    applied_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     approved_by: str | None = None
     approved_at: datetime | None = None
     rejection_reasons: list[str] = Field(default=[], sa_column=Column(JSON))
@@ -294,8 +294,8 @@ class AgentPartnership(SQLModel, table=True):
     agreement_expires_at: datetime | None = None
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_activity: datetime | None = None
 
     # Additional data
@@ -339,9 +339,9 @@ class AchievementBadge(SQLModel, table=True):
     current_awards: int = Field(default=0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    available_from: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    available_from: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     available_until: datetime | None = None
 
     # Additional data
@@ -363,7 +363,7 @@ class AgentBadge(SQLModel, table=True):
 
     # Award details
     awarded_by: str = Field(index=True)  # System or user who awarded the badge
-    awarded_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    awarded_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     award_reason: str = Field(default="", max_length=500)
 
     # Achievement context
@@ -391,8 +391,8 @@ class AgentBadge(SQLModel, table=True):
     congratulation_count: int = Field(default=0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_viewed_at: datetime | None = None
 
     # Additional data
@@ -416,7 +416,7 @@ class CertificationAudit(SQLModel, table=True):
 
     # Audit scheduling
     scheduled_by: str = Field(index=True)
-    scheduled_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    scheduled_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     started_at: datetime | None = None
     completed_at: datetime | None = None
 
@@ -449,8 +449,8 @@ class CertificationAudit(SQLModel, table=True):
     evidence_documents: list[str] = Field(default=[], sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional data
     audit_cert_meta_data: dict[str, Any] = Field(default={}, sa_column=Column(JSON))

apps/coordinator-api/src/app/domain/community.py

@@ -4,7 +4,7 @@ Database models for OpenClaw agent community, third-party solutions, and innovat
 """
 
 import uuid
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 
@@ -61,8 +61,8 @@ class DeveloperProfile(SQLModel, table=True):
     github_handle: str | None = None
     website: str | None = None
 
-    joined_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    last_active: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    joined_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    last_active: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class AgentSolution(SQLModel, table=True):
@@ -91,8 +91,8 @@ class AgentSolution(SQLModel, table=True):
 
     solution_meta_data: dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON))
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     published_at: datetime | None = None
 
 
@@ -116,7 +116,7 @@ class InnovationLab(SQLModel, table=True):
     milestones: list[dict[str, Any]] = Field(default_factory=list, sa_column=Column(JSON))
     publications: list[dict[str, Any]] = Field(default_factory=list, sa_column=Column(JSON))
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     target_completion: datetime | None = None
 
 
@@ -139,8 +139,8 @@ class CommunityPost(SQLModel, table=True):
 
     parent_post_id: str | None = Field(default=None, foreign_key="community_posts.post_id")
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class Hackathon(SQLModel, table=True):
@@ -165,4 +165,4 @@ class Hackathon(SQLModel, table=True):
     registration_end: datetime
     event_start: datetime
     event_end: datetime
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))

apps/coordinator-api/src/app/domain/cross_chain_bridge.py

@@ -6,7 +6,7 @@ Domain models for cross-chain asset transfers, bridge requests, and validator ma
 
 from __future__ import annotations
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from enum import StrEnum
 
 from sqlalchemy import JSON, Column
@@ -75,12 +75,12 @@ class BridgeRequest(SQLModel, table=True):
     required_confirmations: int = Field(default=3)  # Required confirmations
     dispute_reason: str | None = Field(default=None)
     resolution_action: str | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     confirmed_at: datetime | None = Field(default=None)
     completed_at: datetime | None = Field(default=None)
     resolved_at: datetime | None = Field(default=None)
-    expires_at: datetime = Field(default_factory=lambda: datetime.now(datetime.UTC) + timedelta(hours=24))
+    expires_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc) + timedelta(hours=24))
 
     # Relationships
     # transactions: List["BridgeTransaction"] = Relationship(back_populates="bridge_request")
@@ -107,8 +107,8 @@ class SupportedToken(SQLModel, table=True):
     original_token: str | None = Field(default=None)  # Original token address for wrapped tokens
     supported_chains: list[int] = Field(default_factory=list, sa_column=Column(JSON))
     bridge_contracts: dict[int, str] = Field(default_factory=dict, sa_column=Column(JSON))  # Chain ID -> Contract address
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class ChainConfig(SQLModel, table=True):
@@ -135,8 +135,8 @@ class ChainConfig(SQLModel, table=True):
     is_testnet: bool = Field(default=False)
     requires_validator: bool = Field(default=True)  # Whether validator confirmation is required
     validator_threshold: float = Field(default=0.67)  # Validator threshold percentage
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class Validator(SQLModel, table=True):
@@ -162,8 +162,8 @@ class Validator(SQLModel, table=True):
     is_active: bool = Field(default=True, index=True)
     supported_chains: list[int] = Field(default_factory=list, sa_column=Column(JSON))
     val_meta_data: dict[str, str] = Field(default_factory=dict, sa_column=Column(JSON))
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # transactions: List["BridgeTransaction"] = Relationship(back_populates="validator")
@@ -190,7 +190,7 @@ class BridgeTransaction(SQLModel, table=True):
     is_successful: bool = Field(default=False)
     error_message: str | None = Field(default=None)
     retry_count: int = Field(default=0)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
     confirmed_at: datetime | None = Field(default=None)
     completed_at: datetime | None = Field(default=None)
 
@@ -219,8 +219,8 @@ class BridgeDispute(SQLModel, table=True):
     investigator_address: str | None = Field(default=None)
     investigation_notes: str | None = Field(default=None)
     is_resolved: bool = Field(default=False, index=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     resolved_at: datetime | None = Field(default=None)
 
     # Relationships
@@ -241,8 +241,8 @@ class MerkleProof(SQLModel, table=True):
     tree_depth: int = Field(default=0)  # Tree depth
     is_valid: bool = Field(default=False)
     verified_at: datetime | None = Field(default=None)
-    expires_at: datetime = Field(default_factory=lambda: datetime.now(datetime.UTC) + timedelta(hours=24))
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    expires_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc) + timedelta(hours=24))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class BridgeStatistics(SQLModel, table=True):
@@ -264,7 +264,7 @@ class BridgeStatistics(SQLModel, table=True):
     unique_users: int = Field(default=0)  # Unique users for the day
     peak_hour_volume: float = Field(default=0.0)  # Peak hour volume
     peak_hour_transactions: int = Field(default=0)  # Peak hour transactions
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class BridgeAlert(SQLModel, table=True):
@@ -290,8 +290,8 @@ class BridgeAlert(SQLModel, table=True):
     is_resolved: bool = Field(default=False, index=True)
     resolved_at: datetime | None = Field(default=None)
     resolution_notes: str | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    expires_at: datetime = Field(default_factory=lambda: datetime.now(datetime.UTC) + timedelta(hours=24))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    expires_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc) + timedelta(hours=24))
 
 
 class BridgeConfiguration(SQLModel, table=True):
@@ -305,8 +305,8 @@ class BridgeConfiguration(SQLModel, table=True):
     config_type: str = Field(default="string")  # string, number, boolean, json
     description: str = Field(default="")
     is_active: bool = Field(default=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class LiquidityPool(SQLModel, table=True):
@@ -323,9 +323,9 @@ class LiquidityPool(SQLModel, table=True):
     utilized_liquidity: float = Field(default=0.0)  # Utilized liquidity
     utilization_rate: float = Field(default=0.0)  # Utilization rate
     interest_rate: float = Field(default=0.0)  # Interest rate
-    last_updated: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    last_updated: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     is_active: bool = Field(default=True, index=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class BridgeSnapshot(SQLModel, table=True):
@@ -347,7 +347,7 @@ class BridgeSnapshot(SQLModel, table=True):
     bridge_utilization: float = Field(default=0.0)
     top_tokens: dict[str, float] = Field(default_factory=dict, sa_column=Column(JSON))
     top_chains: dict[str, int] = Field(default_factory=dict, sa_column=Column(JSON))
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class ValidatorReward(SQLModel, table=True):
@@ -365,4 +365,4 @@ class ValidatorReward(SQLModel, table=True):
     is_claimed: bool = Field(default=False, index=True)
     claimed_at: datetime | None = Field(default=None)
     claim_transaction_hash: str | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)

apps/coordinator-api/src/app/domain/cross_chain_reputation.py

@@ -3,7 +3,7 @@ Cross-Chain Reputation Extensions
 Extends the existing reputation system with cross-chain capabilities
 """
 
-from datetime import date, datetime
+from datetime import date, datetime, timezone
 from typing import Any
 from uuid import uuid4
 
@@ -38,8 +38,8 @@ class CrossChainReputationConfig(SQLModel, table=True):
     configuration_data: dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class CrossChainReputationAggregation(SQLModel, table=True):
@@ -72,8 +72,8 @@ class CrossChainReputationAggregation(SQLModel, table=True):
     verification_details: dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON))
 
     # Timestamps
-    last_updated: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    last_updated: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Indexes
     __table_args__ = {
@@ -111,7 +111,7 @@ class CrossChainReputationEvent(SQLModel, table=True):
     verified: bool = Field(default=False)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     processed_at: datetime | None = None
 
     # Indexes
@@ -153,8 +153,8 @@ class ReputationMetrics(SQLModel, table=True):
     chain_diversity_score: float = Field(default=0.0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 # Request/Response Models for Cross-Chain API

apps/coordinator-api/src/app/domain/dao_governance.py

@@ -6,7 +6,7 @@ Domain models for managing multi-jurisdictional DAOs, regional councils, and glo
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from uuid import uuid4
 
@@ -46,8 +46,8 @@ class DAOMember(SQLModel, table=True):
     is_council_member: bool = Field(default=False)
     council_region: str | None = Field(default=None, index=True)
 
-    joined_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    last_active: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    joined_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    last_active: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     votes: List["Vote"] = Relationship(back_populates="member")
@@ -76,10 +76,10 @@ class DAOProposal(SQLModel, table=True):
 
     execution_payload: dict[str, str] = Field(default_factory=dict, sa_column=Column(JSON))
 
-    start_time: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    end_time: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    start_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    end_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     votes: List["Vote"] = Relationship(back_populates="proposal")
@@ -98,7 +98,7 @@ class Vote(SQLModel, table=True):
     weight: float = Field()
 
     tx_hash: str | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     proposal: DAOProposal = Relationship(back_populates="votes")
@@ -120,4 +120,4 @@ class TreasuryAllocation(SQLModel, table=True):
     purpose: str = Field()
 
     tx_hash: str | None = Field(default=None)
-    executed_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    executed_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))

apps/coordinator-api/src/app/domain/decentralized_memory.py

@@ -6,7 +6,7 @@ Domain models for managing agent memory and knowledge graphs on IPFS/Filecoin.
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from uuid import uuid4
 
@@ -55,5 +55,5 @@ class AgentMemoryNode(SQLModel, table=True):
     # Blockchain Anchoring
     anchor_tx_hash: str | None = Field(default=None)
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))

apps/coordinator-api/src/app/domain/developer_platform.py

@@ -6,7 +6,7 @@ Domain models for managing the developer ecosystem, bounties, certifications, an
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from uuid import uuid4
 
@@ -45,8 +45,8 @@ class DeveloperProfile(SQLModel, table=True):
     skills: list[str] = Field(default_factory=list, sa_column=Column(JSON))
 
     is_active: bool = Field(default=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     certifications: List["DeveloperCertification"] = Relationship(back_populates="developer")
@@ -65,7 +65,7 @@ class DeveloperCertification(SQLModel, table=True):
     level: CertificationLevel = Field(default=CertificationLevel.BEGINNER)
 
     issued_by: str = Field()  # Could be an agent or a DAO entity
-    issued_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    issued_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = Field(default=None)
 
     ipfs_credential_cid: str | None = Field(default=None)  # Proof of certification
@@ -90,7 +90,7 @@ class RegionalHub(SQLModel, table=True):
     budget_allocation: float = Field(default=0.0)
     spent_budget: float = Field(default=0.0)
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class BountyTask(SQLModel, table=True):
@@ -114,8 +114,8 @@ class BountyTask(SQLModel, table=True):
     assigned_developer_id: str | None = Field(foreign_key="developer_profile.id", default=None)
 
     deadline: datetime | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     submissions: List["BountySubmission"] = Relationship(back_populates="bounty")
@@ -139,7 +139,7 @@ class BountySubmission(SQLModel, table=True):
 
     tx_hash_reward: str | None = Field(default=None)  # Hash of the reward payout transaction
 
-    submitted_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    submitted_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     reviewed_at: datetime | None = Field(default=None)
 
     # Relationships

apps/coordinator-api/src/app/domain/federated_learning.py

@@ -6,7 +6,7 @@ Domain models for managing cross-agent knowledge sharing and collaborative model
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from uuid import uuid4
 
@@ -55,8 +55,8 @@ class FederatedLearningSession(SQLModel, table=True):
 
     global_model_cid: str | None = Field(default=None)  # Final aggregated model
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     participants: List["TrainingParticipant"] = Relationship(back_populates="session")
@@ -79,8 +79,8 @@ class TrainingParticipant(SQLModel, table=True):
     reputation_score_at_join: float = Field(default=0.0)
     earned_reward: float = Field(default=0.0)
 
-    joined_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    joined_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     session: FederatedLearningSession = Relationship(back_populates="participants")
@@ -102,7 +102,7 @@ class TrainingRound(SQLModel, table=True):
 
     metrics: dict[str, float] = Field(default_factory=dict, sa_column=Column(JSON))  # e.g. loss, accuracy
 
-    started_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    started_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     completed_at: datetime | None = Field(default=None)
 
     # Relationships
@@ -125,7 +125,7 @@ class LocalModelUpdate(SQLModel, table=True):
     is_aggregated: bool = Field(default=False)
     rejected_reason: str | None = Field(default=None)  # e.g. "outlier", "failed zk verification"
 
-    submitted_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    submitted_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     round: TrainingRound = Relationship(back_populates="updates")

apps/coordinator-api/src/app/domain/global_marketplace.py

@@ -5,7 +5,7 @@ Domain models for global marketplace operations, multi-region support, and cross
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -71,8 +71,8 @@ class MarketplaceRegion(SQLModel, table=True):
     error_rate: float = Field(default=0.0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Indexes
     __table_args__ = {
@@ -104,8 +104,8 @@ class GlobalMarketplaceConfig(SQLModel, table=True):
     allowed_values: list[str] = Field(default_factory=list, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_modified_by: str | None = Field(default=None)
 
     # Indexes
@@ -153,8 +153,8 @@ class GlobalMarketplaceOffer(SQLModel, table=True):
     cross_chain_pricing: dict[int, float] = Field(default_factory=dict, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = Field(default=None)
 
     # Indexes
@@ -201,8 +201,8 @@ class GlobalMarketplaceTransaction(SQLModel, table=True):
     delivery_status: str = Field(default="pending")  # pending, delivered, failed
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     confirmed_at: datetime | None = Field(default=None)
     completed_at: datetime | None = Field(default=None)
 
@@ -266,8 +266,8 @@ class GlobalMarketplaceAnalytics(SQLModel, table=True):
     analytics_data: dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Indexes
     __table_args__ = {
@@ -313,9 +313,9 @@ class GlobalMarketplaceGovernance(SQLModel, table=True):
     version: int = Field(default=1)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    effective_from: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    effective_from: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = Field(default=None)
 
     # Indexes

apps/coordinator-api/src/app/domain/governance.py

@@ -4,7 +4,7 @@ Database models for OpenClaw DAO, voting, proposals, and governance analytics
 """
 
 import uuid
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 
@@ -51,7 +51,7 @@ class GovernanceProfile(SQLModel, table=True):
 
     delegate_to: str | None = Field(default=None)  # Profile ID they delegate their vote to
 
-    joined_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    joined_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_voted_at: datetime | None = None
 
 
@@ -81,7 +81,7 @@ class Proposal(SQLModel, table=True):
     snapshot_block: int | None = Field(default=None)
     snapshot_timestamp: datetime | None = Field(default=None)
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     voting_starts: datetime
     voting_ends: datetime
     executed_at: datetime | None = None
@@ -102,7 +102,7 @@ class Vote(SQLModel, table=True):
     power_at_snapshot: float = Field(default=0.0)
     delegated_power_at_snapshot: float = Field(default=0.0)
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class DaoTreasury(SQLModel, table=True):
@@ -117,7 +117,7 @@ class DaoTreasury(SQLModel, table=True):
 
     asset_breakdown: dict[str, float] = Field(default_factory=dict, sa_column=Column(JSON))
 
-    last_updated: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    last_updated: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class TransparencyReport(SQLModel, table=True):
@@ -138,4 +138,4 @@ class TransparencyReport(SQLModel, table=True):
 
     metrics: dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON))
 
-    generated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    generated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))

apps/coordinator-api/src/app/domain/gpu_marketplace.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from uuid import uuid4
 
@@ -36,7 +36,7 @@ class GPURegistry(SQLModel, table=True):
     capabilities: list = Field(default_factory=list, sa_column=Column(JSON, nullable=False))
     average_rating: float = Field(default=0.0)
     total_reviews: int = Field(default=0)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), nullable=False, index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), nullable=False, index=True)
 
 
 class ConsumerGPUProfile(SQLModel, table=True):
@@ -84,8 +84,8 @@ class ConsumerGPUProfile(SQLModel, table=True):
     edge_premium_multiplier: float = Field(default=1.0)
     availability_score: float = Field(default=1.0)
 
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class EdgeGPUMetrics(SQLModel, table=True):
@@ -119,7 +119,7 @@ class EdgeGPUMetrics(SQLModel, table=True):
     isp: str | None = Field(default=None)
     connection_type: str | None = Field(default=None)
 
-    timestamp: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
 
 
 class GPUBooking(SQLModel, table=True):
@@ -135,9 +135,9 @@ class GPUBooking(SQLModel, table=True):
     duration_hours: float = Field(default=0.0)
     total_cost: float = Field(default=0.0)
     status: str = Field(default="active", index=True)  # active, completed, cancelled
-    start_time: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    start_time: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     end_time: datetime | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), nullable=False)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), nullable=False)
 
 
 class GPUReview(SQLModel, table=True):
@@ -151,4 +151,4 @@ class GPUReview(SQLModel, table=True):
     user_id: str = Field(default="")
     rating: int = Field(ge=1, le=5)
     comment: str = Field(default="")
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), nullable=False, index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), nullable=False, index=True)

apps/coordinator-api/src/app/domain/job.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from typing import Any, Dict
 from uuid import uuid4
 
@@ -20,8 +20,8 @@ class Job(SQLModel, table=True):
     constraints: Dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON, nullable=False))
 
     ttl_seconds: int = Field(default=900)
-    requested_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    expires_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    requested_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    expires_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     assigned_miner_id: str | None = Field(default=None, index=True)
 

apps/coordinator-api/src/app/domain/job_receipt.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from uuid import uuid4
 
 from sqlalchemy import JSON, Column
@@ -15,4 +15,4 @@ class JobReceipt(SQLModel, table=True):
     job_id: str = Field(index=True, foreign_key="job.id")
     receipt_id: str = Field(index=True)
     payload: dict = Field(sa_column=Column(JSON, nullable=False))
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)

apps/coordinator-api/src/app/domain/marketplace.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from uuid import uuid4
 
 from sqlalchemy import JSON, Column
@@ -17,7 +17,7 @@ class MarketplaceOffer(SQLModel, table=True):
     price: float = Field(default=0.0, nullable=False)
     sla: str = Field(default="")
     status: str = Field(default="open", max_length=20)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), nullable=False, index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), nullable=False, index=True)
     attributes: dict = Field(default_factory=dict, sa_column=Column(JSON, nullable=False))
     # GPU-specific fields
     gpu_model: str | None = Field(default=None, index=True)
@@ -38,4 +38,4 @@ class MarketplaceBid(SQLModel, table=True):
     price: float = Field(default=0.0, nullable=False)
     notes: str | None = Field(default=None)
     status: str = Field(default="pending", nullable=False)
-    submitted_at: datetime = Field(default_factory=datetime.now(datetime.UTC), nullable=False, index=True)
+    submitted_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), nullable=False, index=True)

apps/coordinator-api/src/app/domain/miner.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from typing import Any, Dict
 
 from sqlalchemy import JSON, Column
@@ -18,7 +18,7 @@ class Miner(SQLModel, table=True):
     status: str = Field(default="ONLINE", index=True)
     inflight: int = Field(default=0)
     extra_metadata: Dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON, nullable=False))
-    last_heartbeat: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    last_heartbeat: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
     session_token: str | None = None
     last_job_at: datetime | None = Field(default=None, index=True)
     jobs_completed: int = Field(default=0)

apps/coordinator-api/src/app/domain/payment.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from uuid import uuid4
 
 from sqlalchemy import JSON, Column, Numeric
@@ -33,8 +33,8 @@ class JobPayment(SQLModel, table=True):
     refund_transaction_hash: str | None = Field(default=None, max_length=100)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     escrowed_at: datetime | None = None
     released_at: datetime | None = None
     refunded_at: datetime | None = None
@@ -67,7 +67,7 @@ class PaymentEscrow(SQLModel, table=True):
     is_refunded: bool = Field(default=False)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     released_at: datetime | None = None
     refunded_at: datetime | None = None
     expires_at: datetime | None = None

apps/coordinator-api/src/app/domain/pricing_models.py

@@ -5,7 +5,7 @@ SQLModel definitions for pricing history, strategies, and market metrics
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -92,8 +92,8 @@ class PricingHistory(SQLModel, table=True):
     recommendation_followed: bool | None = None
 
     # Metadata
-    timestamp: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional context
     competitor_prices: list[float] = Field(default_factory=list, sa_column=Column(JSON))
@@ -157,8 +157,8 @@ class ProviderPricingStrategy(SQLModel, table=True):
     strategy_effectiveness_score: float = Field(default=0.0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_applied: datetime | None = None
     expires_at: datetime | None = None
 
@@ -225,8 +225,8 @@ class MarketMetrics(SQLModel, table=True):
     completeness_score: float
 
     # Timestamps
-    timestamp: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional metrics
     custom_metrics: dict[str, float] = Field(default_factory=dict, sa_column=Column(JSON))
@@ -278,7 +278,7 @@ class PriceForecast(SQLModel, table=True):
     market_conditions_at_forecast: dict[str, float] = Field(default_factory=dict, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
     target_timestamp: datetime = Field(index=True)  # When forecast is for
     evaluated_at: datetime | None = None  # When forecast was evaluated
 
@@ -344,8 +344,8 @@ class PricingOptimization(SQLModel, table=True):
     recommendations: list[str] = Field(default_factory=list, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     completed_at: datetime | None = None
 
     # Audit trail
@@ -406,9 +406,9 @@ class PricingAlert(SQLModel, table=True):
     customer_impact_estimate: str | None = None
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    first_seen: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    last_seen: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    first_seen: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    last_seen: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     acknowledged_at: datetime | None = None
     resolved_at: datetime | None = None
 
@@ -470,8 +470,8 @@ class PricingRule(SQLModel, table=True):
     business_impact: float | None = None
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = None
 
     # Audit trail
@@ -534,8 +534,8 @@ class PricingAuditLog(SQLModel, table=True):
     ip_address: str | None = None
 
     # Timestamps
-    timestamp: datetime = Field(default_factory=datetime.now(datetime.UTC), index=True)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc), index=True)
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional metadata
     meta_data: dict[str, Any] = Field(default_factory=dict, sa_column=Column(JSON))

apps/coordinator-api/src/app/domain/pricing_strategies.py

@@ -4,7 +4,7 @@ Defines various pricing strategies and their configurations for dynamic pricing
 """
 
 from dataclasses import dataclass, field
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 
@@ -92,7 +92,7 @@ class StrategyRule:
     action: str  # Action to take when condition is met
     priority: StrategyPriority
     enabled: bool = True
-    created_at: datetime = field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Rule execution tracking
     execution_count: int = 0
@@ -124,8 +124,8 @@ class PricingStrategyConfig:
     regions: list[str] = field(default_factory=list)
 
     # Performance tracking
-    created_at: datetime = field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
     last_applied: datetime | None = None
 
     # Strategy effectiveness metrics
@@ -515,7 +515,7 @@ class StrategyOptimizer:
         if strategy_id not in self.performance_history:
             self.performance_history[strategy_id] = []
 
-        self.performance_history[strategy_id].append({"timestamp": datetime.now(datetime.UTC), "performance": performance_data})
+        self.performance_history[strategy_id].append({"timestamp": datetime.now(timezone.utc), "performance": performance_data})
 
         # Apply optimization rules
         optimized_config = self._apply_optimization_rules(strategy_config, performance_data)

apps/coordinator-api/src/app/domain/reputation.py

@@ -3,7 +3,7 @@ Agent Reputation and Trust System Domain Models
 Implements SQLModel definitions for agent reputation, trust scores, and economic metrics
 """
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -66,9 +66,9 @@ class AgentReputation(SQLModel, table=True):
     specialization_tags: list[str] = Field(default=[], sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    last_activity: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    last_activity: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional metadata
     reputation_history: list[dict[str, Any]] = Field(default=[], sa_column=Column(JSON))
@@ -103,7 +103,7 @@ class TrustScoreCalculation(SQLModel, table=True):
     confidence_level: float = Field(default=0.8, ge=0, le=1.0)
 
     # Timestamps
-    calculated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    calculated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     effective_period: int = Field(default=86400)  # seconds
 
     # Additional data
@@ -140,7 +140,7 @@ class ReputationEvent(SQLModel, table=True):
     verification_status: str = Field(default="pending")  # pending, verified, rejected
 
     # Timestamps
-    occurred_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    occurred_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     processed_at: datetime | None = None
     expires_at: datetime | None = None
 
@@ -176,8 +176,8 @@ class AgentEconomicProfile(SQLModel, table=True):
     liquidity_score: float = Field(default=0.0, ge=0, le=100.0)
 
     # Timestamps
-    profile_date: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    last_updated: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    profile_date: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    last_updated: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Historical data
     earnings_history: list[dict[str, Any]] = Field(default=[], sa_column=Column(JSON))
@@ -217,8 +217,8 @@ class CommunityFeedback(SQLModel, table=True):
     moderator_notes: str = Field(default="", max_length=500)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     helpful_votes: int = Field(default=0)
 
     # Additional metadata
@@ -247,8 +247,8 @@ class ReputationLevelThreshold(SQLModel, table=True):
     fee_discount: float = Field(default=0.0, ge=0, le=100.0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     is_active: bool = Field(default=True)
 
     # Additional configuration

apps/coordinator-api/src/app/domain/rewards.py

@@ -3,7 +3,7 @@ Agent Reward System Domain Models
 Implements SQLModel definitions for performance-based rewards, incentives, and distributions
 """
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -71,8 +71,8 @@ class RewardTierConfig(SQLModel, table=True):
     support_level: str = Field(default="basic")
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     is_active: bool = Field(default=True)
 
     # Additional configuration
@@ -112,9 +112,9 @@ class AgentRewardProfile(SQLModel, table=True):
     longest_streak: int = Field(default=0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    last_activity: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    last_activity: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional metadata
     reward_preferences: dict[str, Any] = Field(default={}, sa_column=Column(JSON))
@@ -148,12 +148,12 @@ class RewardCalculation(SQLModel, table=True):
 
     # Calculation metadata
     calculation_period: str = Field(default="daily")  # daily, weekly, monthly
-    reference_date: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    reference_date: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     trust_score_at_calculation: float = Field(ge=0, le=1000)
     performance_metrics: dict[str, Any] = Field(default={}, sa_column=Column(JSON))
 
     # Timestamps
-    calculated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    calculated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = None
 
     # Additional data
@@ -192,8 +192,8 @@ class RewardDistribution(SQLModel, table=True):
     error_message: str | None = None
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     scheduled_at: datetime | None = None
 
     # Additional data
@@ -228,7 +228,7 @@ class RewardEvent(SQLModel, table=True):
     verification_status: str = Field(default="pending")  # pending, verified, rejected
 
     # Timestamps
-    occurred_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    occurred_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     processed_at: datetime | None = None
     expires_at: datetime | None = None
 
@@ -266,8 +266,8 @@ class RewardMilestone(SQLModel, table=True):
     claimed_at: datetime | None = None
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = None
 
     # Additional data
@@ -314,8 +314,8 @@ class RewardAnalytics(SQLModel, table=True):
     average_processing_time: float = Field(default=0.0)  # milliseconds
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional analytics data
     analytics_data: dict[str, Any] = Field(default={}, sa_column=Column(JSON))

apps/coordinator-api/src/app/domain/trading.py

@@ -3,7 +3,7 @@ Agent-to-Agent Trading Protocol Domain Models
 Implements SQLModel definitions for P2P trading, matching, negotiation, and settlement
 """
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -101,10 +101,10 @@ class TradeRequest(SQLModel, table=True):
     best_match_score: float = Field(default=0.0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = None
-    last_activity: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    last_activity: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional metadata
     tags: list[str] = Field(default=[], sa_column=Column(JSON))
@@ -151,8 +151,8 @@ class TradeMatch(SQLModel, table=True):
     initial_terms: dict[str, Any] = Field(default={}, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     expires_at: datetime | None = None
     last_interaction: datetime | None = None
 
@@ -202,8 +202,8 @@ class TradeNegotiation(SQLModel, table=True):
     auto_accept_threshold: float = Field(default=85.0, ge=0, le=100)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     started_at: datetime | None = None
     completed_at: datetime | None = None
     expires_at: datetime | None = None
@@ -260,9 +260,9 @@ class TradeAgreement(SQLModel, table=True):
     completion_percentage: float = Field(default=0.0, ge=0, le=100)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    signed_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    signed_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     starts_at: datetime | None = None
     ends_at: datetime | None = None
     completed_at: datetime | None = None
@@ -314,7 +314,7 @@ class TradeSettlement(SQLModel, table=True):
 
     # Status and timestamps
     status: TradeStatus = Field(default=TradeStatus.SETTLING)
-    initiated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    initiated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     processed_at: datetime | None = None
     completed_at: datetime | None = None
     refunded_at: datetime | None = None
@@ -365,8 +365,8 @@ class TradeFeedback(SQLModel, table=True):
     moderator_notes: str = Field(default="", max_length=500)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     trade_completed_at: datetime
 
     # Additional data
@@ -421,8 +421,8 @@ class TradingAnalytics(SQLModel, table=True):
     repeat_trade_rate: float = Field(default=0.0, ge=0, le=100.0)
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Additional analytics data
     analytics_data: dict[str, Any] = Field(default={}, sa_column=Column(JSON))

apps/coordinator-api/src/app/domain/user.py

@@ -2,7 +2,7 @@
 User domain models for AITBC
 """
 
-from datetime import datetime
+from datetime import datetime, timezone
 
 from sqlalchemy import JSON
 from sqlmodel import Column, Field, SQLModel
@@ -18,8 +18,8 @@ class User(SQLModel, table=True):
     email: str = Field(unique=True, index=True)
     username: str = Field(unique=True, index=True)
     status: str = Field(default="active", max_length=20)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     last_login: datetime | None = None
 
     # Relationships
@@ -37,8 +37,8 @@ class Wallet(SQLModel, table=True):
     user_id: str = Field(foreign_key="users.id")
     address: str = Field(unique=True, index=True)
     balance: float = Field(default=0.0)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     user: User = Relationship(back_populates="wallets")
@@ -60,7 +60,7 @@ class Transaction(SQLModel, table=True):
     fee: float = Field(default=0.0)
     description: str | None = None
     tx_metadata: str | None = Field(default=None, sa_column=Column(JSON))
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
     confirmed_at: datetime | None = None
 
     # Relationships
@@ -78,5 +78,5 @@ class UserSession(SQLModel, table=True):
     user_id: str = Field(foreign_key="users.id")
     token: str = Field(unique=True, index=True)
     expires_at: datetime
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    last_used: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    last_used: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))

apps/coordinator-api/src/app/domain/wallet.py

@@ -6,7 +6,7 @@ Domain models for managing agent wallets across multiple blockchain networks.
 
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 
 from sqlalchemy import JSON, Column
@@ -41,8 +41,8 @@ class AgentWallet(SQLModel, table=True):
     encrypted_private_key: str | None = Field(default=None)  # Only if managed internally
     kms_key_id: str | None = Field(default=None)  # Reference to external KMS
     meta_data: dict[str, str] = Field(default_factory=dict, sa_column=Column(JSON))
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     balances: List["TokenBalance"] = Relationship(back_populates="wallet")
@@ -78,7 +78,7 @@ class TokenBalance(SQLModel, table=True):
     token_address: str = Field(index=True)  # "native" for native currency
     token_symbol: str = Field()
     balance: float = Field(default=0.0)
-    last_updated: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    last_updated: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     wallet: AgentWallet = Relationship(back_populates="balances")
@@ -109,8 +109,8 @@ class WalletTransaction(SQLModel, table=True):
     nonce: int | None = Field(default=None)
     status: TransactionStatus = Field(default=TransactionStatus.PENDING, index=True)
     error_message: str | None = Field(default=None)
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
     # Relationships
     # DISABLED:     wallet: AgentWallet = Relationship(back_populates="transactions")

apps/coordinator-api/src/app/routers/__init__.py

@@ -11,7 +11,13 @@ from .agent_identity import router as agent_identity
 from .blockchain import router as blockchain
 from .cache_management import router as cache_management
 from .client import router as client
-from .edge_gpu import router as edge_gpu
+
+try:
+    from .edge_gpu import router as edge_gpu
+except ImportError:
+    edge_gpu = None
+    print("WARNING: Edge GPU router not available (missing module)")
+
 from .exchange import router as exchange
 from .explorer import router as explorer
 from .marketplace import router as marketplace

apps/coordinator-api/src/app/routers/adaptive_learning_health.py

@@ -6,7 +6,7 @@ Provides health monitoring for reinforcement learning frameworks
 """
 
 import sys
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 import psutil
@@ -40,7 +40,7 @@ async def adaptive_learning_health(session: Annotated[Session, Depends(get_sessi
             "status": "healthy",
             "service": "adaptive-learning",
             "port": 8011,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "python_version": f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}",
             # System metrics
             "system": {
@@ -97,7 +97,7 @@ async def adaptive_learning_health(session: Annotated[Session, Depends(get_sessi
             "status": "unhealthy",
             "service": "adaptive-learning",
             "port": 8011,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Health check failed",
         }
 
@@ -177,7 +177,7 @@ async def adaptive_learning_deep_health(session: Annotated[Session, Depends(get_
             "status": "healthy",
             "service": "adaptive-learning",
             "port": 8011,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "algorithm_tests": algorithm_tests,
             "safety_tests": safety_tests,
             "overall_health": (
@@ -196,6 +196,6 @@ async def adaptive_learning_deep_health(session: Annotated[Session, Depends(get_
             "status": "unhealthy",
             "service": "adaptive-learning",
             "port": 8011,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Deep health check failed",
         }

apps/coordinator-api/src/app/routers/admin.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Annotated
 
 from fastapi import APIRouter, Depends, Header, HTTPException, Request
@@ -55,7 +55,7 @@ async def create_test_miner(
         if existing_miner:
             # Update existing miner to ONLINE
             existing_miner.status = "ONLINE"
-            existing_miner.last_heartbeat = datetime.now(datetime.UTC)
+            existing_miner.last_heartbeat = datetime.now(timezone.utc)
             existing_miner.session_token = session_token
             session.add(existing_miner)
             session.commit()
@@ -79,7 +79,7 @@ async def create_test_miner(
             session_token=session_token,
             status="ONLINE",
             inflight=0,
-            last_heartbeat=datetime.now(datetime.UTC),
+            last_heartbeat=datetime.now(timezone.utc),
         )
 
         session.add(miner)
@@ -223,7 +223,7 @@ async def get_system_status(
 
         # Get system info
         import sys
-        from datetime import datetime, UTC
+        from datetime import datetime, timezone
 
         import psutil
 
@@ -232,7 +232,7 @@ async def get_system_status(
             "memory_percent": psutil.virtual_memory().percent,
             "disk_percent": psutil.disk_usage("/").percent,
             "python_version": f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}",
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
         }
 
         return {
@@ -275,7 +275,7 @@ async def create_agent_network(network_data: dict) -> dict:
             raise HTTPException(status_code=400, detail="Agent list is required")
 
         # Create network record (simplified for now)
-        network_id = f"network_{datetime.now(datetime.UTC).strftime('%Y%m%d_%H%M%S')}"
+        network_id = f"network_{datetime.now(timezone.utc).strftime('%Y%m%d_%H%M%S')}"
 
         network_response = {
             "id": network_id,
@@ -284,7 +284,7 @@ async def create_agent_network(network_data: dict) -> dict:
             "agents": network_data["agents"],
             "coordination_strategy": network_data.get("coordination", "centralized"),
             "status": "active",
-            "created_at": datetime.now(datetime.UTC).isoformat(),
+            "created_at": datetime.now(timezone.utc).isoformat(),
             "owner_id": "temp_user",
         }
 
@@ -315,11 +315,11 @@ async def get_execution_receipt(execution_id: str) -> dict:
                 {
                     "coordinator_id": "coordinator_1",
                     "signature": "0xmock_attestation_1",
-                    "timestamp": datetime.now(datetime.UTC).isoformat(),
+                    "timestamp": datetime.now(timezone.utc).isoformat(),
                 }
             ],
             "minted_amount": 1000,
-            "recorded_at": datetime.now(datetime.UTC).isoformat(),
+            "recorded_at": datetime.now(timezone.utc).isoformat(),
             "verified": True,
             "block_hash": "0xmock_block_hash",
             "transaction_hash": "0xmock_tx_hash",

apps/coordinator-api/src/app/routers/agent_identity.py

@@ -3,11 +3,12 @@ Agent Identity API Router
 REST API endpoints for agent identity management and cross-chain operations
 """
 
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query
 from fastapi.responses import JSONResponse
+from sqlmodel import Session
 
 from ..agent_identity.manager import AgentIdentityManager
 from ..domain.agent_identity import (
@@ -85,7 +86,7 @@ async def deactivate_agent_identity(
         success = await manager.deactivate_agent_identity(agent_id, reason)
         if not success:
             raise HTTPException(status_code=400, detail="Deactivation failed")
-        return {"agent_id": agent_id, "deactivated": True, "reason": reason, "timestamp": datetime.now(datetime.UTC).isoformat()}
+        return {"agent_id": agent_id, "deactivated": True, "reason": reason, "timestamp": datetime.now(timezone.utc).isoformat()}
     except HTTPException:
         raise
     except Exception as e:
@@ -164,7 +165,7 @@ async def update_cross_chain_mapping(
             "chain_id": chain_id,
             "new_address": new_address,
             "updated": True,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
         }
     except HTTPException:
         raise
@@ -255,7 +256,7 @@ async def get_wallet_balance(agent_id: str, chain_id: int, manager: AgentIdentit
             "agent_id": agent_id,
             "chain_id": chain_id,
             "balance": str(balance),
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
         }
     except Exception as e:
         raise HTTPException(status_code=400, detail="Failed to create agent identity")
@@ -427,7 +428,7 @@ async def cleanup_expired_verifications(manager: AgentIdentityManager = Depends(
     """Clean up expired verification records"""
     try:
         cleaned_count = await manager.registry.cleanup_expired_verifications()
-        return {"cleaned_verifications": cleaned_count, "timestamp": datetime.now(datetime.UTC).isoformat()}
+        return {"cleaned_verifications": cleaned_count, "timestamp": datetime.now(timezone.utc).isoformat()}
     except Exception as e:
         raise HTTPException(status_code=500, detail="Operation failed")
 

apps/coordinator-api/src/app/routers/agent_performance.py

@@ -7,7 +7,7 @@ Advanced Agent Performance API Endpoints
 REST API for meta-learning, resource optimization, and performance enhancement
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -319,7 +319,7 @@ async def adapt_model_to_task(
             "success": True,
             "model_id": model_id,
             "adaptation_results": results,
-            "adapted_at": datetime.now(datetime.UTC).isoformat(),
+            "adapted_at": datetime.now(timezone.utc).isoformat(),
         }
 
     except ValueError as e:
@@ -554,7 +554,7 @@ async def create_capability(
             skill_level=capability_request.skill_level,
             specialization_areas=capability_request.specialization_areas,
             proficiency_score=min(1.0, capability_request.skill_level / 10.0),
-            created_at=datetime.now(datetime.UTC),
+            created_at=datetime.now(timezone.utc),
         )
 
         session.add(capability)
@@ -718,7 +718,7 @@ async def health_check() -> Dict[str, Any]:
 
     return {
         "status": "healthy",
-        "timestamp": datetime.now(datetime.UTC).isoformat(),
+        "timestamp": datetime.now(timezone.utc).isoformat(),
         "version": "1.0.0",
         "services": {
             "meta_learning_engine": "operational",

apps/coordinator-api/src/app/routers/agent_router.py

@@ -7,7 +7,7 @@ AI Agent API Router for Verifiable AI Agent Orchestration
 Provides REST API endpoints for agent workflow management and execution
 """
 
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException
@@ -142,7 +142,7 @@ async def update_workflow(
         for field, value in update_data.items():
             setattr(workflow, field, value)
 
-        workflow.updated_at = datetime.now(datetime.UTC)
+        workflow.updated_at = datetime.now(timezone.utc)
         session.commit()
         session.refresh(workflow)
 
@@ -352,7 +352,7 @@ async def cancel_execution(
 
         # Cancel execution
         state_manager = AgentStateManager(session)
-        await state_manager.update_execution_status(execution_id, status=AgentStatus.CANCELLED, completed_at=datetime.now(datetime.UTC))
+        await state_manager.update_execution_status(execution_id, status=AgentStatus.CANCELLED, completed_at=datetime.now(timezone.utc))
 
         logger.info(f"Cancelled agent execution: {execution_id}")
         return {"message": "Execution cancelled successfully"}
@@ -425,7 +425,7 @@ async def get_execution_logs(
 @router.get("/test")
 async def test_endpoint() -> dict[str, str]:
     """Test endpoint to verify router is working"""
-    return {"message": "Agent router is working", "timestamp": datetime.now(datetime.UTC).isoformat()}
+    return {"message": "Agent router is working", "timestamp": datetime.now(timezone.utc).isoformat()}
 
 
 @router.post("/networks", response_model=dict, status_code=201)
@@ -445,7 +445,7 @@ async def create_agent_network(
             raise HTTPException(status_code=400, detail="Agent list is required")
 
         # Create network record (simplified for now)
-        network_id = f"network_{datetime.now(datetime.UTC).strftime('%Y%m%d_%H%M%S')}"
+        network_id = f"network_{datetime.now(timezone.utc).strftime('%Y%m%d_%H%M%S')}"
 
         network_response = {
             "id": network_id,
@@ -454,7 +454,7 @@ async def create_agent_network(
             "agents": network_data["agents"],
             "coordination_strategy": network_data.get("coordination", "centralized"),
             "status": "active",
-            "created_at": datetime.now(datetime.UTC).isoformat(),
+            "created_at": datetime.now(timezone.utc).isoformat(),
             "owner_id": current_user,
         }
 
@@ -488,11 +488,11 @@ async def get_execution_receipt(
                 {
                     "coordinator_id": "coordinator_1",
                     "signature": "0xmock_attestation_1",
-                    "timestamp": datetime.now(datetime.UTC).isoformat(),
+                    "timestamp": datetime.now(timezone.utc).isoformat(),
                 }
             ],
             "minted_amount": 1000,
-            "recorded_at": datetime.now(datetime.UTC).isoformat(),
+            "recorded_at": datetime.now(timezone.utc).isoformat(),
             "verified": True,
             "block_hash": "0xmock_block_hash",
             "transaction_hash": "0xmock_tx_hash",

apps/coordinator-api/src/app/routers/agent_security_router.py

@@ -125,7 +125,7 @@ async def update_security_policy(
             if hasattr(policy, field):
                 setattr(policy, field, value)
 
-        policy.updated_at = datetime.now(datetime.UTC)
+        policy.updated_at = datetime.now(timezone.utc)
         session.commit()
         session.refresh(policy)
 

apps/coordinator-api/src/app/routers/analytics.py

@@ -7,7 +7,7 @@ Marketplace Analytics API Endpoints
 REST API for analytics, insights, reporting, and dashboards
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -552,7 +552,7 @@ async def get_key_performance_indicators(
     
     try:
         # Get latest metrics for KPIs
-        end_time = datetime.now(datetime.UTC)
+        end_time = datetime.now(timezone.utc)
         
         if period_type == AnalyticsPeriod.DAILY:
             start_time = end_time - timedelta(days=1)

apps/coordinator-api/src/app/routers/bounty.py

@@ -5,14 +5,14 @@ Bounty Management API
 REST API for AI agent bounty system with ZK-proof verification
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException
 from pydantic import BaseModel, Field, validator
 from sqlalchemy.orm import Session
 
-from ..app_logging import get_logger
+from aitbc import get_logger
 from ..auth import get_current_user
 from ..domain.bounty import (
     Bounty,
@@ -38,7 +38,7 @@ class BountyCreateRequest(BaseModel):
     performance_criteria: Dict[str, Any] = Field(default_factory=dict)
     min_accuracy: float = Field(default=90.0, ge=0, le=100)
     max_response_time: Optional[int] = Field(default=None, gt=0)
-    deadline: datetime = Field(..., gt=datetime.now(datetime.UTC))
+    deadline: datetime = Field(..., gt=datetime.now(timezone.utc))
     max_submissions: int = Field(default=100, gt=0, le=1000)
     requires_zk_proof: bool = Field(default=True)
     auto_verify_threshold: float = Field(default=95.0, ge=0, le=100)
@@ -48,9 +48,9 @@ class BountyCreateRequest(BaseModel):
 
     @validator('deadline')
     def validate_deadline(cls, v: datetime) -> datetime:
-        if v <= datetime.now(datetime.UTC):
+        if v <= datetime.now(timezone.utc):
             raise ValueError('Deadline must be in the future')
-        if v > datetime.now(datetime.UTC) + timedelta(days=365):
+        if v > datetime.now(timezone.utc) + timedelta(days=365):
             raise ValueError('Deadline cannot be more than 1 year in the future')
         return v
 
@@ -281,7 +281,7 @@ async def submit_bounty_solution(
         if bounty.status != BountyStatus.ACTIVE:
             raise HTTPException(status_code=400, detail="Bounty is not active")
         
-        if datetime.now(datetime.UTC) > bounty.deadline:
+        if datetime.now(timezone.utc) > bounty.deadline:
             raise HTTPException(status_code=400, detail="Bounty deadline has passed")
         
         # Create submission
@@ -519,7 +519,7 @@ async def expire_bounty(
         if bounty.status != BountyStatus.ACTIVE:
             raise HTTPException(status_code=400, detail="Bounty is not active")
         
-        if datetime.now(datetime.UTC) <= bounty.deadline:
+        if datetime.now(timezone.utc) <= bounty.deadline:
             raise HTTPException(status_code=400, detail="Bounty deadline has not passed")
         
         # Expire bounty

apps/coordinator-api/src/app/routers/certification.py

@@ -7,7 +7,7 @@ Certification and Partnership API Endpoints
 REST API for agent certification, partnership programs, and badge system
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -626,7 +626,7 @@ async def check_automatic_badges(
             "agent_id": agent_id,
             "badges_awarded": awarded_badges,
             "total_awarded": len(awarded_badges),
-            "checked_at": datetime.now(datetime.UTC).isoformat()
+            "checked_at": datetime.now(timezone.utc).isoformat()
         }
         
     except Exception as e:

apps/coordinator-api/src/app/routers/client.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Annotated
 
 from fastapi import APIRouter, Depends, HTTPException, Request, status
@@ -265,7 +265,7 @@ async def create_agent_network(network_data: dict) -> dict:
             raise HTTPException(status_code=400, detail="Agent list is required")
 
         # Create network record (simplified for now)
-        network_id = f"network_{datetime.now(datetime.UTC).strftime('%Y%m%d_%H%M%S')}"
+        network_id = f"network_{datetime.now(timezone.utc).strftime('%Y%m%d_%H%M%S')}"
 
         network_response = {
             "id": network_id,
@@ -274,7 +274,7 @@ async def create_agent_network(network_data: dict) -> dict:
             "agents": network_data["agents"],
             "coordination_strategy": network_data.get("coordination", "centralized"),
             "status": "active",
-            "created_at": datetime.now(datetime.UTC).isoformat(),
+            "created_at": datetime.now(timezone.utc).isoformat(),
             "owner_id": "temp_user",
         }
 
@@ -302,11 +302,11 @@ async def get_execution_receipt(execution_id: str) -> dict:
                 {
                     "coordinator_id": "coordinator_1",
                     "signature": "0xmock_attestation_1",
-                    "timestamp": datetime.now(datetime.UTC).isoformat(),
+                    "timestamp": datetime.now(timezone.utc).isoformat(),
                 }
             ],
             "minted_amount": 1000,
-            "recorded_at": datetime.now(datetime.UTC).isoformat(),
+            "recorded_at": datetime.now(timezone.utc).isoformat(),
             "verified": True,
             "block_hash": "0xmock_block_hash",
             "transaction_hash": "0xmock_tx_hash",

apps/coordinator-api/src/app/routers/confidential.py

@@ -2,7 +2,7 @@
 API endpoints for confidential transactions
 """
 
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 from aitbc import get_logger
@@ -83,13 +83,13 @@ async def create_confidential_transaction(request: ConfidentialTransactionCreate
     """Create a new confidential transaction with optional encryption"""
     try:
         # Generate transaction ID
-        transaction_id = f"ctx-{datetime.now(datetime.UTC).timestamp()}"
+        transaction_id = f"ctx-{datetime.now(timezone.utc).timestamp()}"
 
         # Create base transaction
         transaction = ConfidentialTransaction(
             transaction_id=transaction_id,
             job_id=request.job_id,
-            timestamp=datetime.now(datetime.UTC),
+            timestamp=datetime.now(timezone.utc),
             status="created",
             amount=request.amount,
             pricing=request.pricing,
@@ -178,7 +178,7 @@ async def access_confidential_data(
         transaction = ConfidentialTransaction(
             transaction_id=transaction_id,
             job_id="test-job",
-            timestamp=datetime.now(datetime.UTC),
+            timestamp=datetime.now(timezone.utc),
             status="completed",
             confidential=True,
             participants=["client-456", "miner-789"],
@@ -205,7 +205,7 @@ async def access_confidential_data(
             return ConfidentialAccessResponse(
                 success=True,
                 data={"amount": "1000", "pricing": {"rate": "0.1"}},
-                access_id=f"access-{datetime.now(datetime.UTC).timestamp()}",
+                access_id=f"access-{datetime.now(timezone.utc).timestamp()}",
             )
 
         # Decrypt data
@@ -230,7 +230,7 @@ async def access_confidential_data(
             )
 
             return ConfidentialAccessResponse(
-                success=True, data=decrypted_data, access_id=f"access-{datetime.now(datetime.UTC).timestamp()}"
+                success=True, data=decrypted_data, access_id=f"access-{datetime.now(timezone.utc).timestamp()}"
             )
 
         except Exception as e:
@@ -254,7 +254,7 @@ async def audit_access_confidential_data(
         transaction = ConfidentialTransaction(
             transaction_id=transaction_id,
             job_id="test-job",
-            timestamp=datetime.now(datetime.UTC),
+            timestamp=datetime.now(timezone.utc),
             status="completed",
             confidential=True,
         )
@@ -283,7 +283,7 @@ async def audit_access_confidential_data(
             )
 
             return ConfidentialAccessResponse(
-                success=True, data=decrypted_data, access_id=f"audit-{datetime.now(datetime.UTC).timestamp()}"
+                success=True, data=decrypted_data, access_id=f"audit-{datetime.now(timezone.utc).timestamp()}"
             )
 
         except Exception as e:
@@ -313,7 +313,7 @@ async def register_encryption_key(request: KeyRegistrationRequest, api_key: str
                     success=True,
                     participant_id=request.participant_id,
                     key_version=1,  # Would get from storage
-                    registered_at=datetime.now(datetime.UTC),
+                    registered_at=datetime.now(timezone.utc),
                     error=None,
                 )
         except:
@@ -333,7 +333,7 @@ async def register_encryption_key(request: KeyRegistrationRequest, api_key: str
     except KeyManagementError as e:
         logger.error(f"Key registration failed: {e}")
         return KeyRegistrationResponse(
-            success=False, participant_id=request.participant_id, key_version=0, registered_at=datetime.now(datetime.UTC), error=str(e)
+            success=False, participant_id=request.participant_id, key_version=0, registered_at=datetime.now(timezone.utc), error=str(e)
         )
     except Exception as e:
         logger.error(f"Failed to register key: {e}")

apps/coordinator-api/src/app/routers/cross_chain_integration.py

@@ -3,7 +3,7 @@ Cross-Chain Integration API Router
 REST API endpoints for enhanced multi-chain wallet adapter, cross-chain bridge service, and transaction manager
 """
 
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 from uuid import uuid4
 
@@ -217,7 +217,7 @@ async def verify_signature(
             "message": message,
             "address": address,
             "chain_id": chain_id,
-            "verified_at": datetime.now(datetime.UTC).isoformat(),
+            "verified_at": datetime.now(timezone.utc).isoformat(),
         }
 
     except Exception as e:
@@ -606,7 +606,7 @@ async def get_cross_chain_health(session: Session = Depends(get_session)) -> dic
             "transaction_success_rate": tx_stats["success_rate"],
             "average_processing_time": tx_stats["average_processing_time_minutes"],
             "active_liquidity_pools": len(await bridge_service.get_liquidity_pools()),
-            "last_updated": datetime.now(datetime.UTC).isoformat(),
+            "last_updated": datetime.now(timezone.utc).isoformat(),
         }
 
     except Exception as e:
@@ -675,7 +675,7 @@ async def get_cross_chain_config(session: Session = Depends(get_session)) -> dic
             "transaction_priorities": transaction_priorities,
             "routing_strategies": routing_strategies,
             "security_levels": [level.value for level in SecurityLevel],
-            "last_updated": datetime.now(datetime.UTC).isoformat(),
+            "last_updated": datetime.now(timezone.utc).isoformat(),
         }
 
     except Exception as e:

apps/coordinator-api/src/app/routers/developer_platform.py

@@ -3,7 +3,7 @@ Developer Platform API Router
 REST API endpoints for the developer ecosystem including bounties, certifications, and regional hubs
 """
 
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -440,7 +440,7 @@ async def verify_certification(certification_id: str, session: Session = Depends
             "issued_by": certification.issued_by,
             "granted_at": certification.granted_at.isoformat(),
             "is_valid": True,
-            "verification_timestamp": datetime.now(datetime.UTC).isoformat(),
+            "verification_timestamp": datetime.now(timezone.utc).isoformat(),
         }
 
     except HTTPException:
@@ -746,7 +746,7 @@ async def get_platform_overview(
                 "regions_covered": 12,  # Mock data
             },
             "staking": {"total_staked": 1000000.0, "active_stakers": 500, "average_apy": 7.5},  # Mock data
-            "generated_at": datetime.now(datetime.UTC).isoformat(),
+            "generated_at": datetime.now(timezone.utc).isoformat(),
         }
 
     except Exception as e:
@@ -785,7 +785,7 @@ async def get_platform_health(session: Session = Depends(get_session)) -> dict[s
                 "pending_submissions": 8,  # Mock data
                 "system_uptime": "99.9%",
             },
-            "last_updated": datetime.now(datetime.UTC).isoformat(),
+            "last_updated": datetime.now(timezone.utc).isoformat(),
         }
 
     except Exception as e:

apps/coordinator-api/src/app/routers/dynamic_pricing.py

@@ -5,7 +5,7 @@ Dynamic Pricing API Router
 Provides RESTful endpoints for dynamic pricing management
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -147,7 +147,7 @@ async def get_price_forecast(
             accuracy_score=(
                 sum(point.confidence for point in forecast_points) / len(forecast_points) if forecast_points else 0.0
             ),
-            generated_at=datetime.now(datetime.UTC).isoformat(),
+            generated_at=datetime.now(timezone.utc).isoformat(),
         )
 
     except Exception as e:
@@ -197,7 +197,7 @@ async def set_pricing_strategy(
             provider_id=provider_id,
             strategy=request.strategy,
             constraints=request.constraints,
-            set_at=datetime.now(datetime.UTC).isoformat(),
+            set_at=datetime.now(timezone.utc).isoformat(),
             status="active",
         )
 
@@ -239,7 +239,7 @@ async def get_pricing_strategy(
             provider_id=provider_id,
             strategy=strategy.value,
             constraints=constraints_dict,
-            set_at=datetime.now(datetime.UTC).isoformat(),
+            set_at=datetime.now(timezone.utc).isoformat(),
             status="active",
         )
 
@@ -531,7 +531,7 @@ async def get_price_history(
             )
 
         # Filter history by period
-        cutoff_time = datetime.now(datetime.UTC) - timedelta(days=days)
+        cutoff_time = datetime.now(timezone.utc) - timedelta(days=days)
         filtered_history = [point for point in engine.pricing_history[resource_id] if point.timestamp >= cutoff_time]
 
         # Calculate statistics
@@ -637,7 +637,7 @@ async def bulk_pricing_update(
             success_count=success_count,
             error_count=error_count,
             results=results,
-            processed_at=datetime.now(datetime.UTC).isoformat(),
+            processed_at=datetime.now(timezone.utc).isoformat(),
         )
 
     except Exception as e:
@@ -691,7 +691,7 @@ async def pricing_health_check(
 
         return {
             "status": overall_status,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "services": {
                 "pricing_engine": {
                     "status": engine_status,
@@ -710,4 +710,4 @@ async def pricing_health_check(
 
     except Exception as e:
         logger.error(f"Dynamic pricing health check failed: {e}")
-        return {"status": "unhealthy", "timestamp": datetime.now(datetime.UTC).isoformat(), "error": "Health check failed"}
+        return {"status": "unhealthy", "timestamp": datetime.now(timezone.utc).isoformat(), "error": "Health check failed"}

apps/coordinator-api/src/app/routers/ecosystem_dashboard.py

@@ -5,14 +5,14 @@ Ecosystem Metrics Dashboard API
 REST API for developer ecosystem metrics and analytics
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException
 from pydantic import BaseModel, Field
 from sqlalchemy.orm import Session
 
-from ..app_logging import get_logger
+from aitbc import get_logger
 from ..auth import get_current_user
 from ..domain.bounty import AgentMetrics, BountyStats, EcosystemMetrics
 from ..services.ecosystem_service import EcosystemService
@@ -345,7 +345,7 @@ async def get_ecosystem_alerts(
             "alerts": alerts,
             "severity": severity,
             "count": len(alerts),
-            "last_updated": datetime.now(datetime.UTC)
+            "last_updated": datetime.now(timezone.utc)
         }
         
     except Exception as e:
@@ -422,7 +422,7 @@ async def get_real_time_metrics(
         real_time_data = await ecosystem_service.get_real_time_metrics()
         
         return {
-            "timestamp": datetime.now(datetime.UTC),
+            "timestamp": datetime.now(timezone.utc),
             "metrics": real_time_data,
             "update_frequency": "60s"  # Update frequency in seconds
         }
@@ -442,7 +442,7 @@ async def get_kpi_dashboard(
         
         return {
             "kpis": kpi_data,
-            "last_updated": datetime.now(datetime.UTC),
+            "last_updated": datetime.now(timezone.utc),
             "refresh_interval": 300  # 5 minutes
         }
         

apps/coordinator-api/src/app/routers/exchange.py

@@ -4,7 +4,7 @@ Bitcoin Exchange Router for AITBC
 
 import time
 import uuid
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 from fastapi import APIRouter, BackgroundTasks, HTTPException, Request
@@ -214,7 +214,7 @@ async def monitor_payment(payment_id: str) -> None:
 @router.get("/agents/test")
 async def test_agent_endpoint() -> dict[str, str]:
     """Test endpoint to verify agent routes are working"""
-    return {"message": "Agent routes are working", "timestamp": datetime.now(datetime.UTC).isoformat()}
+    return {"message": "Agent routes are working", "timestamp": datetime.now(timezone.utc).isoformat()}
 
 
 @router.post("/agents/networks", response_model=dict, status_code=201)
@@ -230,7 +230,7 @@ async def create_agent_network(network_data: dict) -> dict[str, Any]:
             raise HTTPException(status_code=400, detail="Agent list is required")
 
         # Create network record (simplified for now)
-        network_id = f"network_{datetime.now(datetime.UTC).strftime('%Y%m%d_%H%M%S')}"
+        network_id = f"network_{datetime.now(timezone.utc).strftime('%Y%m%d_%H%M%S')}"
 
         network_response = {
             "id": network_id,
@@ -239,7 +239,7 @@ async def create_agent_network(network_data: dict) -> dict[str, Any]:
             "agents": network_data["agents"],
             "coordination_strategy": network_data.get("coordination", "centralized"),
             "status": "active",
-            "created_at": datetime.now(datetime.UTC).isoformat(),
+            "created_at": datetime.now(timezone.utc).isoformat(),
             "owner_id": "temp_user",
         }
 
@@ -269,11 +269,11 @@ async def get_execution_receipt(execution_id: str) -> dict[str, Any]:
                 {
                     "coordinator_id": "coordinator_1",
                     "signature": "0xmock_attestation_1",
-                    "timestamp": datetime.now(datetime.UTC).isoformat(),
+                    "timestamp": datetime.now(timezone.utc).isoformat(),
                 }
             ],
             "minted_amount": 1000,
-            "recorded_at": datetime.now(datetime.UTC).isoformat(),
+            "recorded_at": datetime.now(timezone.utc).isoformat(),
             "verified": True,
             "block_hash": "0xmock_block_hash",
             "transaction_hash": "0xmock_tx_hash",

apps/coordinator-api/src/app/routers/global_marketplace.py

@@ -3,7 +3,7 @@ Global Marketplace API Router
 REST API endpoints for global marketplace operations, multi-region support, and cross-chain integration
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any
 
 from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException, Query
@@ -585,7 +585,7 @@ async def get_global_marketplace_health(
         recent_transactions = (
             session.execute(
                 select(func.count(GlobalMarketplaceTransaction.id)).where(
-                    GlobalMarketplaceTransaction.created_at >= datetime.now(datetime.UTC) - timedelta(hours=24)
+                    GlobalMarketplaceTransaction.created_at >= datetime.now(timezone.utc) - timedelta(hours=24)
                 )
             ).scalar()
             or 0
@@ -608,7 +608,7 @@ async def get_global_marketplace_health(
                 "recent_24h": recent_transactions,
                 "activity_rate": transaction_activity,
             },
-            "last_updated": datetime.now(datetime.UTC).isoformat(),
+            "last_updated": datetime.now(timezone.utc).isoformat(),
         }
 
     except Exception as e:

apps/coordinator-api/src/app/routers/global_marketplace_integration.py

@@ -3,7 +3,7 @@ Global Marketplace Integration API Router
 REST API endpoints for integrated global marketplace with cross-chain capabilities
 """
 
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -350,7 +350,7 @@ async def get_marketplace_integration_analytics(
             "active_regions": len(active_regions),
             "supported_chains": len(supported_chains),
             "integration_config": integration_service.integration_config,
-            "last_updated": datetime.now(datetime.UTC).isoformat(),
+            "last_updated": datetime.now(timezone.utc).isoformat(),
         }
 
     except Exception as e:
@@ -394,7 +394,7 @@ async def get_integration_status(
                 "auto_bridge_execution": config["auto_bridge_execution"],
                 "multi_chain_wallet_support": config["multi_chain_wallet_support"],
             },
-            "last_updated": datetime.now(datetime.UTC).isoformat(),
+            "last_updated": datetime.now(timezone.utc).isoformat(),
         }
 
     except Exception as e:
@@ -463,7 +463,7 @@ async def get_integration_config(
                 }
                 for priority in TransactionPriority
             },
-            "last_updated": datetime.now(datetime.UTC).isoformat(),
+            "last_updated": datetime.now(timezone.utc).isoformat(),
         }
 
     except Exception as e:
@@ -492,7 +492,7 @@ async def update_integration_config(
         return {
             "updated_config": integration_service.integration_config,
             "updated_keys": list(config_updates.keys()),
-            "updated_at": datetime.now(datetime.UTC).isoformat(),
+            "updated_at": datetime.now(timezone.utc).isoformat(),
         }
 
     except ValueError as e:
@@ -554,7 +554,7 @@ async def get_integration_health(
         if health_status["issues"]:
             health_status["overall_status"] = "degraded"
 
-        health_status["last_updated"] = datetime.now(datetime.UTC).isoformat()
+        health_status["last_updated"] = datetime.now(timezone.utc).isoformat()
 
         return health_status
 
@@ -571,7 +571,7 @@ async def run_integration_diagnostics(
     """Run integration diagnostics"""
 
     try:
-        diagnostics = {"diagnostic_type": diagnostic_type, "started_at": datetime.now(datetime.UTC).isoformat(), "results": {}}
+        diagnostics = {"diagnostic_type": diagnostic_type, "started_at": datetime.now(timezone.utc).isoformat(), "results": {}}
 
         if diagnostic_type == "full" or diagnostic_type == "services":
             # Test services
@@ -617,9 +617,9 @@ async def run_integration_diagnostics(
                 "configuration": integration_service.integration_config,
             }
 
-        diagnostics["completed_at"] = datetime.now(datetime.UTC).isoformat()
+        diagnostics["completed_at"] = datetime.now(timezone.utc).isoformat()
         diagnostics["duration_seconds"] = (
-            datetime.now(datetime.UTC) - datetime.fromisoformat(diagnostics["started_at"])
+            datetime.now(timezone.utc) - datetime.fromisoformat(diagnostics["started_at"])
         ).total_seconds()
 
         return diagnostics

apps/coordinator-api/src/app/routers/governance_enhanced.py

@@ -3,7 +3,7 @@ Enhanced Governance API Router
 REST API endpoints for multi-jurisdictional DAO governance, regional councils, treasury management, and staking
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -433,7 +433,7 @@ async def check_compliance_status(
             "jurisdiction": jurisdiction,
             "is_compliant": True,
             "compliance_level": "full",
-            "last_check": datetime.now(datetime.UTC).isoformat(),
+            "last_check": datetime.now(timezone.utc).isoformat(),
             "requirements_met": {
                 "kyc_verified": True,
                 "aml_screened": True,
@@ -441,7 +441,7 @@ async def check_compliance_status(
                 "minimum_stake_met": True,
             },
             "restrictions": [],
-            "next_review_date": (datetime.now(datetime.UTC) + timedelta(days=365)).isoformat(),
+            "next_review_date": (datetime.now(timezone.utc) + timedelta(days=365)).isoformat(),
         }
 
         return compliance_status
@@ -490,7 +490,7 @@ async def get_governance_system_health(
                 "treasury_balance": analytics["treasury"]["total_allocations"],
                 "staking_pools": analytics["staking"]["active_pools"],
             },
-            "last_updated": datetime.now(datetime.UTC).isoformat(),
+            "last_updated": datetime.now(timezone.utc).isoformat(),
         }
 
         return health_data
@@ -539,7 +539,7 @@ async def get_governance_platform_status(
                 "treasury_utilization": f"{analytics['treasury']['utilization_rate']}%",
                 "staking_apy": f"{analytics['staking']['average_apy']}%",
             },
-            "last_updated": datetime.now(datetime.UTC).isoformat(),
+            "last_updated": datetime.now(timezone.utc).isoformat(),
         }
 
         return status_data

apps/coordinator-api/src/app/routers/gpu_multimodal_health.py

@@ -7,7 +7,7 @@ Provides health monitoring for CUDA-optimized multi-modal processing
 
 import subprocess
 import sys
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 import psutil
@@ -37,7 +37,7 @@ async def gpu_multimodal_health(session: Annotated[Session, Depends(get_session)
             "status": "healthy" if gpu_info["available"] else "degraded",
             "service": "gpu-multimodal",
             "port": 8010,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "python_version": f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}",
             # System metrics
             "system": {
@@ -86,7 +86,7 @@ async def gpu_multimodal_health(session: Annotated[Session, Depends(get_session)
             "status": "unhealthy",
             "service": "gpu-multimodal",
             "port": 8010,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Health check failed",
         }
 
@@ -145,7 +145,7 @@ async def gpu_multimodal_deep_health(session: Annotated[Session, Depends(get_ses
             "status": "healthy" if gpu_info["available"] else "degraded",
             "service": "gpu-multimodal",
             "port": 8010,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "gpu_info": gpu_info,
             "cuda_tests": cuda_tests,
             "overall_health": (
@@ -161,7 +161,7 @@ async def gpu_multimodal_deep_health(session: Annotated[Session, Depends(get_ses
             "status": "unhealthy",
             "service": "gpu-multimodal",
             "port": 8010,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Deep health check failed",
         }
 

apps/coordinator-api/src/app/routers/marketplace_enhanced_health.py

@@ -6,14 +6,14 @@ Provides health monitoring for royalties, licensing, verification, and analytics
 """
 
 import sys
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 import psutil
 from fastapi import APIRouter, Depends
 from sqlalchemy.orm import Session
 
-from ..app_logging import get_logger
+from aitbc import get_logger
 from ..services.marketplace_enhanced import EnhancedMarketplaceService
 from ..storage import get_session
 
@@ -41,7 +41,7 @@ async def marketplace_enhanced_health(session: Annotated[Session, Depends(get_se
             "status": "healthy",
             "service": "marketplace-enhanced",
             "port": 8002,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "python_version": f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}",
             # System metrics
             "system": {
@@ -98,7 +98,7 @@ async def marketplace_enhanced_health(session: Annotated[Session, Depends(get_se
             "status": "unhealthy",
             "service": "marketplace-enhanced",
             "port": 8002,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Health check failed",
         }
 
@@ -173,7 +173,7 @@ async def marketplace_enhanced_deep_health(session: Annotated[Session, Depends(g
             "status": "healthy",
             "service": "marketplace-enhanced",
             "port": 8002,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "feature_tests": feature_tests,
             "overall_health": "pass" if all(test.get("status") == "pass" for test in feature_tests.values()) else "degraded",
         }
@@ -184,6 +184,6 @@ async def marketplace_enhanced_deep_health(session: Annotated[Session, Depends(g
             "status": "unhealthy",
             "service": "marketplace-enhanced",
             "port": 8002,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Deep health check failed",
         }

apps/coordinator-api/src/app/routers/marketplace_gpu.py

@@ -5,7 +5,7 @@ GPU marketplace endpoints backed by persistent SQLModel tables.
 """
 
 import statistics
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any
 from uuid import uuid4
 
@@ -157,7 +157,7 @@ async def register_gpu(request: dict[str, Any], session: Annotated[Session, Depe
 
     # Create GPU registry record
     import uuid
-    from datetime import datetime, UTC
+    from datetime import datetime, timezone
 
     gpu_id = f"gpu_{uuid.uuid4().hex[:8]}"
     
@@ -180,7 +180,7 @@ async def register_gpu(request: dict[str, Any], session: Annotated[Session, Depe
         capabilities=[],
         average_rating=0.0,
         total_reviews=0,
-        created_at=datetime.now(datetime.UTC)
+        created_at=datetime.now(timezone.utc)
     )
     
     session.add(gpu_record)
@@ -259,9 +259,9 @@ async def buy_gpu(
         )
 
     # Create booking for the purchase
-    from datetime import datetime, UTC, timedelta
+    from datetime import datetime, timezone, timedelta
     
-    start_time = datetime.now(datetime.UTC)
+    start_time = datetime.now(timezone.utc)
     end_time = start_time + timedelta(hours=request.duration_hours)
     
     # Calculate total cost
@@ -411,7 +411,7 @@ async def sell_gpu(
         "listing_price": request.listing_price,
         "status": "listed",
         "description": request.description,
-        "timestamp": datetime.now(datetime.UTC).isoformat() + "Z",
+        "timestamp": datetime.now(timezone.utc).isoformat() + "Z",
     }
 
 
@@ -442,7 +442,7 @@ async def book_gpu(
             status_code=http_status.HTTP_400_BAD_REQUEST, detail="Booking duration cannot exceed 8760 hours (1 year)"
         )
 
-    start_time = datetime.now(datetime.UTC)
+    start_time = datetime.now(timezone.utc)
     end_time = start_time + timedelta(hours=request.duration_hours)
 
     # Validate booking end time is in the future
@@ -593,7 +593,7 @@ async def submit_ollama_task(
         )
 
     task_id = f"task_{uuid4().hex[:10]}"
-    submitted_at = datetime.now(datetime.UTC).isoformat() + "Z"
+    submitted_at = datetime.now(timezone.utc).isoformat() + "Z"
 
     return {
         "task_id": task_id,
@@ -619,7 +619,7 @@ async def send_payment(
         )
 
     tx_id = f"tx_{uuid4().hex[:10]}"
-    processed_at = datetime.now(datetime.UTC).isoformat() + "Z"
+    processed_at = datetime.now(timezone.utc).isoformat() + "Z"
 
     return {
         "tx_id": tx_id,
@@ -920,7 +920,7 @@ async def get_pricing(
         },
         "individual_gpu_pricing": dynamic_prices,
         "market_analysis": market_analysis,
-        "pricing_timestamp": datetime.now(datetime.UTC).isoformat() + "Z",
+        "pricing_timestamp": datetime.now(timezone.utc).isoformat() + "Z",
     }
 
 
@@ -935,5 +935,5 @@ async def bid_gpu(request: dict[str, Any], session: Session = Depends(get_sessio
         "gpu_id": request.get("gpu_id"),
         "bid_amount": request.get("bid_amount"),
         "duration_hours": request.get("duration_hours"),
-        "timestamp": datetime.now(datetime.UTC).isoformat() + "Z",
+        "timestamp": datetime.now(timezone.utc).isoformat() + "Z",
     }

apps/coordinator-api/src/app/routers/miner.py

@@ -1,4 +1,4 @@
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Annotated, Any
 
 from fastapi import APIRouter, Depends, HTTPException, Request, Response, status
@@ -87,7 +87,7 @@ async def submit_result(
     metrics = dict(req.metrics or {})
     duration_ms = metrics.get("duration_ms")
     if duration_ms is None and job.requested_at:
-        duration_ms = int((datetime.now(datetime.UTC) - job.requested_at).total_seconds() * 1000)
+        duration_ms = int((datetime.now(timezone.utc) - job.requested_at).total_seconds() * 1000)
         metrics["duration_ms"] = duration_ms
 
     receipt = receipt_service.create_receipt(job, miner_id, req.result, metrics)

apps/coordinator-api/src/app/routers/modality_optimization_health.py

@@ -6,7 +6,7 @@ Provides health monitoring for specialized modality optimization strategies
 """
 
 import sys
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 import psutil
@@ -33,7 +33,7 @@ async def modality_optimization_health(session: Annotated[Session, Depends(get_s
             "status": "healthy",
             "service": "modality-optimization",
             "port": 8004,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "python_version": f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}",
             # System metrics
             "system": {
@@ -86,7 +86,7 @@ async def modality_optimization_health(session: Annotated[Session, Depends(get_s
             "status": "unhealthy",
             "service": "modality-optimization",
             "port": 8004,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Health check failed",
         }
 
@@ -148,7 +148,7 @@ async def modality_optimization_deep_health(session: Annotated[Session, Depends(
             "status": "healthy",
             "service": "modality-optimization",
             "port": 8004,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "optimization_tests": optimization_tests,
             "overall_health": (
                 "pass" if all(test.get("status") == "pass" for test in optimization_tests.values()) else "degraded"
@@ -161,6 +161,6 @@ async def modality_optimization_deep_health(session: Annotated[Session, Depends(
             "status": "unhealthy",
             "service": "modality-optimization",
             "port": 8004,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Deep health check failed",
         }

apps/coordinator-api/src/app/routers/monitoring_dashboard.py

@@ -4,7 +4,7 @@ Provides a unified dashboard for all 6 enhanced services
 """
 
 import asyncio
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 from fastapi import APIRouter
@@ -75,7 +75,7 @@ async def monitoring_dashboard() -> dict[str, Any]:
         overall_metrics = calculate_overall_metrics(health_data)
 
         dashboard_data = {
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "overall_status": overall_metrics["overall_status"],
             "services": health_data,
             "metrics": overall_metrics,
@@ -84,7 +84,7 @@ async def monitoring_dashboard() -> dict[str, Any]:
                 "healthy_services": len([s for s in health_data.values() if s.get("status") == "healthy"]),
                 "degraded_services": len([s for s in health_data.values() if s.get("status") == "degraded"]),
                 "unhealthy_services": len([s for s in health_data.values() if s.get("status") == "unhealthy"]),
-                "last_updated": datetime.now(datetime.UTC).strftime("%Y-%m-%d %H:%M:%S UTC"),
+                "last_updated": datetime.now(timezone.utc).strftime("%Y-%m-%d %H:%M:%S UTC"),
             },
         }
 
@@ -98,7 +98,7 @@ async def monitoring_dashboard() -> dict[str, Any]:
         logger.error(f"Failed to generate monitoring dashboard: {e}")
         return {
             "error": "Failed to generate dashboard",
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "services": SERVICES,
             "overall_status": "error",
             "summary": {
@@ -106,7 +106,7 @@ async def monitoring_dashboard() -> dict[str, Any]:
                 "healthy_services": 0,
                 "degraded_services": 0,
                 "unhealthy_services": len(SERVICES),
-                "last_updated": datetime.now(datetime.UTC).strftime("%Y-%m-%d %H:%M:%S UTC"),
+                "last_updated": datetime.now(timezone.utc).strftime("%Y-%m-%d %H:%M:%S UTC"),
             },
         }
 
@@ -119,7 +119,7 @@ async def services_summary() -> dict[str, Any]:
     try:
         health_data = await collect_all_health_data()
 
-        summary = {"timestamp": datetime.now(datetime.UTC).isoformat(), "services": {}}
+        summary = {"timestamp": datetime.now(timezone.utc).isoformat(), "services": {}}
 
         for service_id, service_info in SERVICES.items():
             health = health_data.get(service_id, {})
@@ -136,7 +136,7 @@ async def services_summary() -> dict[str, Any]:
 
     except Exception as e:
         logger.error(f"Failed to generate services summary: {e}")
-        return {"error": "Failed to generate summary", "timestamp": datetime.now(datetime.UTC).isoformat()}
+        return {"error": "Failed to generate summary", "timestamp": datetime.now(timezone.utc).isoformat()}
 
 
 @router.get("/dashboard/metrics", tags=["monitoring"], summary="System Metrics")
@@ -156,7 +156,7 @@ async def system_metrics() -> dict[str, Any]:
         network = psutil.net_io_counters()
 
         metrics = {
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "system": {
                 "cpu_percent": cpu_percent,
                 "cpu_count": psutil.cpu_count(),
@@ -184,7 +184,7 @@ async def system_metrics() -> dict[str, Any]:
 
     except Exception as e:
         logger.error(f"Failed to collect system metrics: {e}")
-        return {"error": "Failed to collect metrics", "timestamp": datetime.now(datetime.UTC).isoformat()}
+        return {"error": "Failed to collect metrics", "timestamp": datetime.now(timezone.utc).isoformat()}
 
 
 async def collect_all_health_data() -> dict[str, Any]:
@@ -206,7 +206,7 @@ async def collect_all_health_data() -> dict[str, Any]:
             health_data[service_id] = {
                 "status": "unhealthy",
                 "error": str(result),
-                "timestamp": datetime.now(datetime.UTC).isoformat(),
+                "timestamp": datetime.now(timezone.utc).isoformat(),
             }
         else:
             health_data[service_id] = result
@@ -225,7 +225,7 @@ async def check_service_health(service_name: str, service_config: dict[str, Any]
         return {
             "status": "healthy",
             "response_time": 0.1,  # Placeholder - would be measured
-            "last_check": datetime.now(datetime.UTC).isoformat(),
+            "last_check": datetime.now(timezone.utc).isoformat(),
             "details": response,
         }
     except NetworkError as e:
@@ -233,11 +233,11 @@ async def check_service_health(service_name: str, service_config: dict[str, Any]
         return {
             "status": "unhealthy",
             "error": str(e),
-            "last_check": datetime.now(datetime.UTC).isoformat(),
+            "last_check": datetime.now(timezone.utc).isoformat(),
         }
-        return {"status": "unhealthy", "error": "connection refused", "timestamp": datetime.now(datetime.UTC).isoformat()}
+        return {"status": "unhealthy", "error": "connection refused", "timestamp": datetime.now(timezone.utc).isoformat()}
     except Exception as e:
-        return {"status": "unhealthy", "error": str(e), "timestamp": datetime.now(datetime.UTC).isoformat()}
+        return {"status": "unhealthy", "error": str(e), "timestamp": datetime.now(timezone.utc).isoformat()}
 
 
 def calculate_overall_metrics(health_data: dict[str, Any]) -> dict[str, Any]:

apps/coordinator-api/src/app/routers/multimodal_health.py

@@ -6,7 +6,7 @@ Provides health monitoring for multi-modal processing capabilities
 """
 
 import sys
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 import psutil
@@ -38,7 +38,7 @@ async def multimodal_health(session: Annotated[Session, Depends(get_session)]) -
             "status": "healthy",
             "service": "multimodal-agent",
             "port": 8002,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "python_version": f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}",
             # System metrics
             "system": {
@@ -81,7 +81,7 @@ async def multimodal_health(session: Annotated[Session, Depends(get_session)]) -
             "status": "unhealthy",
             "service": "multimodal-agent",
             "port": 8002,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Health check failed",
         }
 
@@ -129,7 +129,7 @@ async def multimodal_deep_health(session: Annotated[Session, Depends(get_session
             "status": "healthy",
             "service": "multimodal-agent",
             "port": 8002,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "modality_tests": modality_tests,
             "overall_health": "pass" if all(test.get("status") == "pass" for test in modality_tests.values()) else "degraded",
         }
@@ -140,6 +140,6 @@ async def multimodal_deep_health(session: Annotated[Session, Depends(get_session
             "status": "unhealthy",
             "service": "multimodal-agent",
             "port": 8002,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Deep health check failed",
         }

apps/coordinator-api/src/app/routers/openclaw_enhanced_app.py

@@ -44,13 +44,13 @@ async def detailed_health() -> dict[str, Any]:
     try:
         import psutil
         import logging
-        from datetime import datetime, UTC
+        from datetime import datetime, timezone
         
         return {
             "status": "healthy",
             "service": "openclaw-enhanced",
             "port": 8014,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "python_version": "3.13.5",
             "system": {
                 "cpu_percent": psutil.cpu_percent(),

apps/coordinator-api/src/app/routers/openclaw_enhanced_health.py

@@ -6,7 +6,7 @@ Provides health monitoring for agent orchestration, edge computing, and ecosyste
 """
 
 import sys
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 import psutil
@@ -43,7 +43,7 @@ async def openclaw_enhanced_health(session: Annotated[Session, Depends(get_sessi
             "status": "healthy" if edge_status["available"] else "degraded",
             "service": "openclaw-enhanced",
             "port": 8007,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "python_version": f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}",
             # System metrics
             "system": {
@@ -95,7 +95,7 @@ async def openclaw_enhanced_health(session: Annotated[Session, Depends(get_sessi
             "status": "unhealthy",
             "service": "openclaw-enhanced",
             "port": 8007,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Health check failed",
         }
 
@@ -162,7 +162,7 @@ async def openclaw_enhanced_deep_health(session: Annotated[Session, Depends(get_
             "status": "healthy" if edge_status["available"] else "degraded",
             "service": "openclaw-enhanced",
             "port": 8007,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "feature_tests": feature_tests,
             "edge_computing": edge_status,
             "overall_health": (
@@ -178,7 +178,7 @@ async def openclaw_enhanced_deep_health(session: Annotated[Session, Depends(get_
             "status": "unhealthy",
             "service": "openclaw-enhanced",
             "port": 8007,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "error": "Deep health check failed",
         }
 

apps/coordinator-api/src/app/routers/partners.py

@@ -8,7 +8,7 @@ Partner Router - Third-party integration management
 
 import hashlib
 import secrets
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException
@@ -91,7 +91,7 @@ async def register_partner(partner: PartnerRegister, session: Annotated[Session,
         "api_key": api_key,
         "api_secret_hash": hashlib.sha256(api_secret.encode()).hexdigest(),
         "rate_limit": rate_limits.get(partner.integration_type, rate_limits["other"]),
-        "created_at": datetime.now(datetime.UTC),
+        "created_at": datetime.now(timezone.utc),
         "status": "active",
     }
 
@@ -162,7 +162,7 @@ async def create_webhook(
         "events": webhook.events,
         "secret": webhook.secret,
         "status": "active",
-        "created_at": datetime.now(datetime.UTC),
+        "created_at": datetime.now(timezone.utc),
     }
 
     return WebhookResponse(

apps/coordinator-api/src/app/routers/reputation.py

@@ -7,7 +7,7 @@ Reputation Management API Endpoints
 REST API for agent reputation, trust scores, and economic profiles
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -272,7 +272,7 @@ async def get_trust_score_breakdown(
             security_score=security_score,
             economic_score=economic_score,
             reputation_level=reputation_level.value,
-            calculated_at=datetime.now(datetime.UTC).isoformat()
+            calculated_at=datetime.now(timezone.utc).isoformat()
         )
         
     except Exception as e:
@@ -348,7 +348,7 @@ async def get_reputation_metrics(
         ]
         
         # Recent activity (last 24 hours)
-        recent_cutoff = datetime.now(datetime.UTC) - timedelta(days=1)
+        recent_cutoff = datetime.now(timezone.utc) - timedelta(days=1)
         recent_events = session.execute(
             select(func.count(ReputationEvent.id)).where(
                 ReputationEvent.occurred_at >= recent_cutoff
@@ -474,7 +474,7 @@ async def update_specialization(
             raise HTTPException(status_code=404, detail="Reputation profile not found")
         
         reputation.specialization_tags = specialization_tags
-        reputation.updated_at = datetime.now(datetime.UTC)
+        reputation.updated_at = datetime.now(timezone.utc)
         
         session.commit()
         session.refresh(reputation)
@@ -510,7 +510,7 @@ async def update_region(
             raise HTTPException(status_code=404, detail="Reputation profile not found")
         
         reputation.geographic_region = region
-        reputation.updated_at = datetime.now(datetime.UTC)
+        reputation.updated_at = datetime.now(timezone.utc)
         
         session.commit()
         session.refresh(reputation)
@@ -568,7 +568,7 @@ async def get_cross_chain_reputation(
                     "last_updated": reputation.updated_at.isoformat()
                 }
             },
-            "last_updated": datetime.now(datetime.UTC).isoformat()
+            "last_updated": datetime.now(timezone.utc).isoformat()
         }
         
     except HTTPException:
@@ -601,7 +601,7 @@ async def sync_cross_chain_reputation(
             "agent_id": agent_id,
             "sync_status": "completed",
             "chains_synced": [1],
-            "sync_timestamp": datetime.now(datetime.UTC).isoformat(),
+            "sync_timestamp": datetime.now(timezone.utc).isoformat(),
             "message": "Cross-chain reputation synchronized successfully"
         }
         
@@ -651,7 +651,7 @@ async def get_cross_chain_leaderboard(
             "total_count": len(agents),
             "limit": limit,
             "min_score": min_score,
-            "last_updated": datetime.now(datetime.UTC).isoformat()
+            "last_updated": datetime.now(timezone.utc).isoformat()
         }
         
     except Exception as e:
@@ -691,7 +691,7 @@ async def submit_cross_chain_event(
         new_score = max(0, min(1000, old_score + (impact * 1000)))
         
         reputation.trust_score = new_score
-        reputation.updated_at = datetime.now(datetime.UTC)
+        reputation.updated_at = datetime.now(timezone.utc)
         
         # Update reputation level if needed
         if new_score >= 900:
@@ -708,13 +708,13 @@ async def submit_cross_chain_event(
         session.commit()
         
         return {
-            "event_id": f"event_{datetime.now(datetime.UTC).strftime('%Y%m%d%H%M%S')}",
+            "event_id": f"event_{datetime.now(timezone.utc).strftime('%Y%m%d%H%M%S')}",
             "agent_id": agent_id,
             "event_type": event_data['event_type'],
             "impact_score": impact,
             "old_score": old_score / 1000.0,
             "new_score": new_score / 1000.0,
-            "processed_at": datetime.now(datetime.UTC).isoformat()
+            "processed_at": datetime.now(timezone.utc).isoformat()
         }
         
     except HTTPException:
@@ -785,7 +785,7 @@ async def get_cross_chain_analytics(
                 "average_consistency_score": 1.0,
                 "chain_diversity_score": 0.0  # No cross-chain diversity yet
             },
-            "generated_at": datetime.now(datetime.UTC).isoformat()
+            "generated_at": datetime.now(timezone.utc).isoformat()
         }
         
     except Exception as e:

apps/coordinator-api/src/app/routers/rewards.py

@@ -7,7 +7,7 @@ Reward System API Endpoints
 REST API for agent rewards, incentives, and performance-based earnings
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -368,13 +368,13 @@ async def get_reward_leaderboard(
     try:
         # Calculate date range based on period
         if period == "daily":
-            start_date = datetime.now(datetime.UTC) - timedelta(days=1)
+            start_date = datetime.now(timezone.utc) - timedelta(days=1)
         elif period == "weekly":
-            start_date = datetime.now(datetime.UTC) - timedelta(days=7)
+            start_date = datetime.now(timezone.utc) - timedelta(days=7)
         elif period == "monthly":
-            start_date = datetime.now(datetime.UTC) - timedelta(days=30)
+            start_date = datetime.now(timezone.utc) - timedelta(days=30)
         else:
-            start_date = datetime.now(datetime.UTC) - timedelta(days=7)
+            start_date = datetime.now(timezone.utc) - timedelta(days=7)
         
         # Query reward profiles
         query = select(AgentRewardProfile).where(

apps/coordinator-api/src/app/routers/staking.py

@@ -5,14 +5,14 @@ Staking Management API
 REST API for AI agent staking system with reputation-based yield farming
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException
 from pydantic import BaseModel, Field, validator
 from sqlalchemy.orm import Session
 
-from ..app_logging import get_logger
+from aitbc import get_logger
 from ..auth import get_current_user
 from ..domain.bounty import AgentMetrics, AgentStake, EcosystemMetrics, PerformanceTier, StakeStatus, StakingPool
 from ..services.blockchain_service import BlockchainService
@@ -303,7 +303,7 @@ async def unbond_stake(
         if stake.status != StakeStatus.ACTIVE:
             raise HTTPException(status_code=400, detail="Stake is not active")
         
-        if datetime.now(datetime.UTC) < stake.end_time:
+        if datetime.now(timezone.utc) < stake.end_time:
             raise HTTPException(status_code=400, detail="Lock period has not ended")
         
         # Initiate unbonding

apps/coordinator-api/src/app/routers/trading.py

@@ -7,7 +7,7 @@ P2P Trading Protocol API Endpoints
 REST API for agent-to-agent trading, matching, negotiation, and settlement
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, Query
@@ -634,9 +634,9 @@ async def get_trading_analytics(
             end_dt = datetime.fromisoformat(end_date)
         
         if not start_dt:
-            start_dt = datetime.now(datetime.UTC) - timedelta(days=30)
+            start_dt = datetime.now(timezone.utc) - timedelta(days=30)
         if not end_dt:
-            end_dt = datetime.now(datetime.UTC)
+            end_dt = datetime.now(timezone.utc)
         
         # Get analytics data (mock implementation)
         # In real implementation, this would query TradingAnalytics table

apps/coordinator-api/src/app/routers/users.py

@@ -9,7 +9,7 @@ User Management Router for AITBC
 import hashlib
 import time
 import uuid
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, status
@@ -70,8 +70,8 @@ async def register_user(user_data: UserCreate, session: Annotated[Session, Depen
         id=str(uuid.uuid4()),
         email=user_data.email,
         username=user_data.username,
-        created_at=datetime.now(datetime.UTC),
-        last_login=datetime.now(datetime.UTC),
+        created_at=datetime.now(timezone.utc),
+        last_login=datetime.now(timezone.utc),
     )
 
     session.add(user)
@@ -79,7 +79,7 @@ async def register_user(user_data: UserCreate, session: Annotated[Session, Depen
     session.refresh(user)
 
     # Create wallet for user
-    wallet = Wallet(user_id=user.id, address=f"aitbc_{user.id[:8]}", balance=0.0, created_at=datetime.now(datetime.UTC))
+    wallet = Wallet(user_id=user.id, address=f"aitbc_{user.id[:8]}", balance=0.0, created_at=datetime.now(timezone.utc))
 
     session.add(wallet)
     session.commit()
@@ -112,8 +112,8 @@ async def login_user(login_data: UserLogin, session: Annotated[Session, Depends(
             id=str(uuid.uuid4()),
             email=f"{login_data.wallet_address}@aitbc.local",
             username=f"user_{login_data.wallet_address[-8:]}_{str(uuid.uuid4())[:8]}",
-            created_at=datetime.now(datetime.UTC),
-            last_login=datetime.now(datetime.UTC),
+            created_at=datetime.now(timezone.utc),
+            last_login=datetime.now(timezone.utc),
         )
 
         session.add(user)
@@ -121,14 +121,14 @@ async def login_user(login_data: UserLogin, session: Annotated[Session, Depends(
         session.refresh(user)
 
         # Create wallet
-        wallet = Wallet(user_id=user.id, address=login_data.wallet_address, balance=0.0, created_at=datetime.now(datetime.UTC))
+        wallet = Wallet(user_id=user.id, address=login_data.wallet_address, balance=0.0, created_at=datetime.now(timezone.utc))
 
         session.add(wallet)
         session.commit()
     else:
         # Update last login
         user = session.execute(select(User).where(User.id == wallet.user_id)).first()
-        user.last_login = datetime.now(datetime.UTC)
+        user.last_login = datetime.now(timezone.utc)
         session.commit()
 
     # Create session token

apps/coordinator-api/src/app/routers/zk_applications.py

@@ -8,7 +8,7 @@ ZK Applications Router - Privacy-preserving features for AITBC
 
 import hashlib
 import secrets
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException
@@ -67,7 +67,7 @@ async def create_identity_commitment(
     commitment_input = f"{user.email}:{salt}"
     commitment = hashlib.sha256(commitment_input.encode()).hexdigest()
 
-    return {"commitment": commitment, "salt": salt, "user_id": user.user_id, "created_at": datetime.now(datetime.UTC).isoformat()}
+    return {"commitment": commitment, "salt": salt, "user_id": user.user_id, "created_at": datetime.now(timezone.utc).isoformat()}
 
 
 @router.post("/zk/membership/verify")
@@ -104,7 +104,7 @@ async def verify_group_membership(
         "group_id": request.group_id,
         "verified": True,
         "nullifier": request.nullifier,
-        "timestamp": datetime.now(datetime.UTC).isoformat(),
+        "timestamp": datetime.now(timezone.utc).isoformat(),
     }
 
 
@@ -127,7 +127,7 @@ async def submit_private_bid(request: PrivateBidRequest, session: Annotated[Sess
         "auction_id": request.auction_id,
         "commitment": request.bid_commitment,
         "status": "submitted",
-        "timestamp": datetime.now(datetime.UTC).isoformat(),
+        "timestamp": datetime.now(timezone.utc).isoformat(),
     }
 
 
@@ -172,7 +172,7 @@ async def verify_computation_proof(
         "result_hash": request.result_hash,
         "public_inputs": request.public_inputs,
         "verification_key": "demo_vk_12345",
-        "timestamp": datetime.now(datetime.UTC).isoformat(),
+        "timestamp": datetime.now(timezone.utc).isoformat(),
     }
 
     return verification_result
@@ -197,7 +197,7 @@ async def create_private_receipt(
         "user_address": user_address,
         "commitment": commitment,
         "privacy_level": privacy_level,
-        "timestamp": datetime.now(datetime.UTC).isoformat(),
+        "timestamp": datetime.now(timezone.utc).isoformat(),
         "verified": True,
     }
 

apps/coordinator-api/src/app/services/access_control.py

@@ -2,7 +2,7 @@
 Access control service for confidential transactions
 """
 
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from enum import StrEnum
 from typing import Any
 
@@ -216,7 +216,7 @@ class AccessController:
 
     def _is_business_hours(self) -> bool:
         """Check if current time is within business hours"""
-        now = datetime.now(datetime.UTC)
+        now = datetime.now(timezone.utc)
 
         # Monday-Friday, 9 AM - 5 PM UTC
         if now.weekday() >= 5:  # Weekend
@@ -229,7 +229,7 @@ class AccessController:
 
     def _check_retention_period(self, transaction: dict, role: str | None) -> bool:
         """Check if data is within retention period for role"""
-        transaction_date = transaction.get("timestamp", datetime.now(datetime.UTC))
+        transaction_date = transaction.get("timestamp", datetime.now(timezone.utc))
 
         # Different retention periods for different roles
         if role == "regulator":
@@ -243,7 +243,7 @@ class AccessController:
 
         expiry_date = transaction_date + timedelta(days=retention_days)
 
-        return datetime.now(datetime.UTC) <= expiry_date
+        return datetime.now(timezone.utc) <= expiry_date
 
     def _get_participant_info(self, participant_id: str) -> dict | None:
         """Get participant information"""
@@ -274,8 +274,8 @@ class AccessController:
                 "transaction_miner_id": "miner-789",
                 "miner_id": "miner-789",
                 "purpose": "settlement",
-                "created_at": datetime.now(datetime.UTC).isoformat(),
-                "expires_at": (datetime.now(datetime.UTC) + timedelta(hours=1)).isoformat(),
+                "created_at": datetime.now(timezone.utc).isoformat(),
+                "expires_at": (datetime.now(timezone.utc) + timedelta(hours=1)).isoformat(),
                 "metadata": {"job_id": "job-123", "amount": "1000", "currency": "AITBC"},
             }
         if transaction_id.startswith("ctx-"):
@@ -286,8 +286,8 @@ class AccessController:
                 "transaction_miner_id": "miner-456",
                 "miner_id": "miner-456",
                 "purpose": "settlement",
-                "created_at": datetime.now(datetime.UTC).isoformat(),
-                "expires_at": (datetime.now(datetime.UTC) + timedelta(hours=1)).isoformat(),
+                "created_at": datetime.now(timezone.utc).isoformat(),
+                "expires_at": (datetime.now(timezone.utc) + timedelta(hours=1)).isoformat(),
                 "metadata": {"job_id": "job-456", "amount": "1000", "currency": "AITBC"},
             }
         else:
@@ -301,7 +301,7 @@ class AccessController:
         """Get cached access result"""
         if cache_key in self._access_cache:
             cached = self._access_cache[cache_key]
-            if datetime.now(datetime.UTC) - cached["timestamp"] < self._cache_ttl:
+            if datetime.now(timezone.utc) - cached["timestamp"] < self._cache_ttl:
                 return cached
             else:
                 del self._access_cache[cache_key]
@@ -309,20 +309,20 @@ class AccessController:
 
     def _cache_result(self, cache_key: str, allowed: bool):
         """Cache access result"""
-        self._access_cache[cache_key] = {"allowed": allowed, "timestamp": datetime.now(datetime.UTC)}
+        self._access_cache[cache_key] = {"allowed": allowed, "timestamp": datetime.now(timezone.utc)}
 
     def create_access_policy(
         self, name: str, participants: list[str], conditions: dict[str, Any], access_level: AccessLevel
     ) -> str:
         """Create a new access policy"""
-        policy_id = f"policy_{datetime.now(datetime.UTC).timestamp()}"
+        policy_id = f"policy_{datetime.now(timezone.utc).timestamp()}"
 
         policy = {
             "participants": participants,
             "conditions": conditions,
             "access_level": access_level,
             "time_restrictions": conditions.get("time_restrictions"),
-            "created_at": datetime.now(datetime.UTC).isoformat(),
+            "created_at": datetime.now(timezone.utc).isoformat(),
         }
 
         self.policy_store.add_policy(policy_id, policy)

apps/coordinator-api/src/app/services/adaptive_learning.py

@@ -11,7 +11,7 @@ Reinforcement learning frameworks for agent self-improvement
 from aitbc import get_logger
 
 logger = get_logger(__name__)
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 
@@ -380,7 +380,7 @@ class AdaptiveLearningService:
                 "action_space_size": len(environment.action_space),
                 "safety_constraints": len(environment.safety_constraints),
                 "max_episodes": environment.max_episodes,
-                "created_at": datetime.now(datetime.UTC).isoformat(),
+                "created_at": datetime.now(timezone.utc).isoformat(),
             }
 
         except Exception as e:
@@ -403,7 +403,7 @@ class AdaptiveLearningService:
                 "discount_factor": agent.discount_factor,
                 "exploration_rate": agent.exploration_rate,
                 "status": "created",
-                "created_at": datetime.now(datetime.UTC).isoformat(),
+                "created_at": datetime.now(timezone.utc).isoformat(),
             }
 
         except Exception as e:
@@ -427,7 +427,7 @@ class AdaptiveLearningService:
         self.training_sessions[session_id] = {
             "agent_id": agent_id,
             "environment_id": environment_id,
-            "start_time": datetime.now(datetime.UTC),
+            "start_time": datetime.now(timezone.utc),
             "config": training_config,
             "status": "running",
         }
@@ -438,7 +438,7 @@ class AdaptiveLearningService:
 
             # Update session
             self.training_sessions[session_id].update(
-                {"status": "completed", "end_time": datetime.now(datetime.UTC), "results": training_results}
+                {"status": "completed", "end_time": datetime.now(timezone.utc), "results": training_results}
             )
 
             return {
@@ -626,7 +626,7 @@ class AdaptiveLearningService:
             "performance_metrics": agent.performance_metrics,
             "current_exploration_rate": agent.exploration_rate,
             "policy_size": len(agent.q_table) if hasattr(agent, "q_table") else "neural_network",
-            "last_updated": datetime.now(datetime.UTC).isoformat(),
+            "last_updated": datetime.now(timezone.utc).isoformat(),
         }
 
     async def evaluate_agent(self, agent_id: str, environment_id: str, evaluation_config: dict[str, Any]) -> dict[str, Any]:
@@ -678,7 +678,7 @@ class AdaptiveLearningService:
             "min_reward": float(min(evaluation_rewards)),
             "average_episode_length": float(np.mean(evaluation_lengths)),
             "success_rate": sum(1 for r in evaluation_rewards if r > 0) / len(evaluation_rewards),
-            "evaluation_timestamp": datetime.now(datetime.UTC).isoformat(),
+            "evaluation_timestamp": datetime.now(timezone.utc).isoformat(),
         }
 
     async def create_reward_function(self, reward_id: str, reward_type: RewardType, config: dict[str, Any]) -> dict[str, Any]:
@@ -690,7 +690,7 @@ class AdaptiveLearningService:
             "config": config,
             "parameters": config.get("parameters", {}),
             "weights": config.get("weights", {}),
-            "created_at": datetime.now(datetime.UTC).isoformat(),
+            "created_at": datetime.now(timezone.utc).isoformat(),
         }
 
         self.reward_functions[reward_id] = reward_function

apps/coordinator-api/src/app/services/advanced_ai_service.py

@@ -7,7 +7,7 @@ Port: 8009
 """
 
 import uuid
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 
 import numpy as np
@@ -120,7 +120,7 @@ async def health_check():
     """Health check endpoint"""
     return {
         "status": "healthy",
-        "timestamp": datetime.now(datetime.UTC).isoformat(),
+        "timestamp": datetime.now(timezone.utc).isoformat(),
         "gpu_available": torch.cuda.is_available(),
         "services": {"rl_engine": "operational", "fusion_engine": "operational", "advanced_learning": "operational"},
     }
@@ -193,7 +193,7 @@ async def process_multi_modal_fusion(request: MultiModalFusionRequest):
     """Process multi-modal fusion"""
 
     try:
-        start_time = datetime.now(datetime.UTC)
+        start_time = datetime.now(timezone.utc)
 
         # Simulate database session
 
@@ -213,13 +213,13 @@ async def process_multi_modal_fusion(request: MultiModalFusionRequest):
                     modal_data=request.modal_data, performance_requirements=request.fusion_config or {}
                 )
 
-        processing_time = (datetime.now(datetime.UTC) - start_time).total_seconds() * 1000
+        processing_time = (datetime.now(timezone.utc) - start_time).total_seconds() * 1000
 
         return {
             "fusion_result": result,
             "processing_time_ms": processing_time,
             "strategy_used": request.fusion_strategy,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
         }
 
     except Exception as e:
@@ -243,7 +243,7 @@ async def optimize_gpu_processing(request: GPUOptimizationRequest):
                 modality_features=request.modality_features, attention_config=request.attention_config
             )
 
-        return {"optimization_result": result, "timestamp": datetime.now(datetime.UTC).isoformat()}
+        return {"optimization_result": result, "timestamp": datetime.now(timezone.utc).isoformat()}
 
     except Exception as e:
         logger.error(f"GPU optimization failed: {e}")
@@ -255,7 +255,7 @@ async def advanced_ai_processing(request: AdvancedAIRequest):
     """Unified advanced AI processing endpoint"""
 
     try:
-        datetime.now(datetime.UTC)
+        datetime.now(timezone.utc)
 
         if request.request_type == "rl_training":
             # Convert to RL training request
@@ -335,7 +335,7 @@ async def get_performance_metrics():
         }
 
         return {
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(timezone.utc).isoformat(),
             "gpu_metrics": gpu_metrics,
             "service_metrics": service_metrics,
             "system_health": "operational",

apps/coordinator-api/src/app/services/advanced_analytics.py

@@ -7,7 +7,7 @@ Real-time analytics dashboard, market insights, and performance metrics
 import asyncio
 from collections import defaultdict, deque
 from dataclasses import dataclass, field
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 

apps/coordinator-api/src/app/services/advanced_learning.py

@@ -10,7 +10,7 @@ from aitbc import get_logger
 logger = get_logger(__name__)
 import json
 from dataclasses import asdict, dataclass
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 
@@ -231,8 +231,8 @@ class AdvancedLearningService:
                 performance_metrics={},
                 training_data_size=0,
                 validation_data_size=0,
-                created_at=datetime.now(datetime.UTC),
-                last_updated=datetime.now(datetime.UTC),
+                created_at=datetime.now(timezone.utc),
+                last_updated=datetime.now(timezone.utc),
                 status=LearningStatus.INITIALIZING,
             )
 
@@ -251,7 +251,7 @@ class AdvancedLearningService:
                 computation_efficiency=0.0,
                 learning_rate=self.default_learning_rate,
                 convergence_speed=0.0,
-                last_evaluation=datetime.now(datetime.UTC),
+                last_evaluation=datetime.now(timezone.utc),
             )
 
             logger.info(f"Model created: {model_id} for agent {agent_id}")
@@ -298,7 +298,7 @@ class AdvancedLearningService:
                 model_id=model_id,
                 agent_id=model.agent_id,
                 learning_type=model.learning_type,
-                start_time=datetime.now(datetime.UTC),
+                start_time=datetime.now(timezone.utc),
                 end_time=None,
                 status=LearningStatus.INITIALIZING,
                 training_data=training_data,
@@ -316,7 +316,7 @@ class AdvancedLearningService:
 
             # Update model status
             model.status = LearningStatus.TRAINING
-            model.last_updated = datetime.now(datetime.UTC)
+            model.last_updated = datetime.now(timezone.utc)
 
             # Start training
             asyncio.create_task(self._execute_learning_session(session_id))
@@ -349,7 +349,7 @@ class AdvancedLearningService:
                 model_id=model.id,
                 agent_id=agent_id,
                 learning_type=LearningType.META_LEARNING,
-                start_time=datetime.now(datetime.UTC),
+                start_time=datetime.now(timezone.utc),
                 end_time=None,
                 status=LearningStatus.TRAINING,
                 training_data=meta_data["training"],
@@ -400,7 +400,7 @@ class AdvancedLearningService:
                 model_id=model_id,
                 agent_id="federated",
                 learning_type=LearningType.FEDERATED,
-                start_time=datetime.now(datetime.UTC),
+                start_time=datetime.now(timezone.utc),
                 end_time=None,
                 status=LearningStatus.TRAINING,
                 training_data=[],
@@ -443,16 +443,16 @@ class AdvancedLearningService:
             if model.status != LearningStatus.ACTIVE:
                 raise ValueError(f"Model {model_id} not active")
 
-            start_time = datetime.now(datetime.UTC)
+            start_time = datetime.now(timezone.utc)
 
             # Simulate inference
             prediction = await self._simulate_inference(model, input_data)
 
             # Update analytics
-            inference_time = (datetime.now(datetime.UTC) - start_time).total_seconds()
+            inference_time = (datetime.now(timezone.utc) - start_time).total_seconds()
             analytics = self.learning_analytics[model_id]
             analytics.total_inference_time += inference_time
-            analytics.last_evaluation = datetime.now(datetime.UTC)
+            analytics.last_evaluation = datetime.now(timezone.utc)
 
             logger.info(f"Prediction made with model {model_id}")
             return prediction
@@ -480,7 +480,7 @@ class AdvancedLearningService:
 
             # Update model performance
             model.accuracy = adaptation_results.get("accuracy", model.accuracy)
-            model.last_updated = datetime.now(datetime.UTC)
+            model.last_updated = datetime.now(timezone.utc)
 
             # Update analytics
             analytics = self.learning_analytics[model_id]
@@ -573,7 +573,7 @@ class AdvancedLearningService:
             # Update model
             model.accuracy = optimization_results.get("accuracy", model.accuracy)
             model.inference_time = optimization_results.get("inference_time", model.inference_time)
-            model.last_updated = datetime.now(datetime.UTC)
+            model.last_updated = datetime.now(timezone.utc)
 
             logger.info(f"Model optimized: {model_id}")
             return True
@@ -625,12 +625,12 @@ class AdvancedLearningService:
             model.recall = np.random.uniform(0.7, 0.95)
             model.f1_score = np.random.uniform(0.7, 0.95)
             model.loss = session.results.get(f"epoch_{session.iterations}", {}).get("loss", 0.1)
-            model.training_time = (datetime.now(datetime.UTC) - session.start_time).total_seconds()
+            model.training_time = (datetime.now(timezone.utc) - session.start_time).total_seconds()
             model.inference_time = np.random.uniform(0.01, 0.1)
             model.status = LearningStatus.ACTIVE
-            model.last_updated = datetime.now(datetime.UTC)
+            model.last_updated = datetime.now(timezone.utc)
 
-            session.end_time = datetime.now(datetime.UTC)
+            session.end_time = datetime.now(timezone.utc)
             session.status = LearningStatus.COMPLETED
 
             # Update analytics
@@ -673,9 +673,9 @@ class AdvancedLearningService:
             # Update model with meta-learning results
             model.accuracy = np.random.uniform(0.8, 0.98)
             model.status = LearningStatus.ACTIVE
-            model.last_updated = datetime.now(datetime.UTC)
+            model.last_updated = datetime.now(timezone.utc)
 
-            session.end_time = datetime.now(datetime.UTC)
+            session.end_time = datetime.now(timezone.utc)
             session.status = LearningStatus.COMPLETED
 
             logger.info(f"Meta-learning completed: {session_id}")
@@ -713,9 +713,9 @@ class AdvancedLearningService:
             # Update model
             model.accuracy = np.random.uniform(0.75, 0.92)
             model.status = LearningStatus.ACTIVE
-            model.last_updated = datetime.now(datetime.UTC)
+            model.last_updated = datetime.now(timezone.utc)
 
-            session.end_time = datetime.now(datetime.UTC)
+            session.end_time = datetime.now(timezone.utc)
             session.status = LearningStatus.COMPLETED
 
             logger.info(f"Federated learning completed: {session_id}")
@@ -811,7 +811,7 @@ class AdvancedLearningService:
 
         while True:
             try:
-                current_time = datetime.now(datetime.UTC)
+                current_time = datetime.now(timezone.utc)
 
                 for session_id, session in self.learning_sessions.items():
                     if session.status == LearningStatus.TRAINING:
@@ -862,7 +862,7 @@ class AdvancedLearningService:
 
         while True:
             try:
-                current_time = datetime.now(datetime.UTC)
+                current_time = datetime.now(timezone.utc)
                 inactive_sessions = []
 
                 for session_id, session in self.learning_sessions.items():
@@ -905,7 +905,7 @@ class AdvancedLearningService:
             "models": {k: asdict(v) for k, v in self.models.items()},
             "sessions": {k: asdict(v) for k, v in self.learning_sessions.items()},
             "analytics": {k: asdict(v) for k, v in self.learning_analytics.items()},
-            "export_timestamp": datetime.now(datetime.UTC).isoformat(),
+            "export_timestamp": datetime.now(timezone.utc).isoformat(),
         }
 
         if format.lower() == "json":

apps/coordinator-api/src/app/services/advanced_reinforcement_learning.py

@@ -5,7 +5,7 @@ Phase 5.1: Advanced AI Capabilities Enhancement
 """
 
 import asyncio
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Any
 from uuid import uuid4
 
@@ -616,7 +616,7 @@ class AdvancedReinforcementLearningEngine:
             rl_config.success_rate_history = training_results["success_rate_history"]
             rl_config.convergence_episode = training_results["convergence_episode"]
             rl_config.status = "ready"
-            rl_config.trained_at = datetime.now(datetime.UTC)
+            rl_config.trained_at = datetime.now(timezone.utc)
             rl_config.training_progress = 1.0
 
             session.commit()
@@ -1329,7 +1329,7 @@ class MarketplaceStrategyOptimizer:
             rl_config.deployment_performance = deployment_performance
             rl_config.deployment_count += 1
             rl_config.status = "deployed"
-            rl_config.deployed_at = datetime.now(datetime.UTC)
+            rl_config.deployed_at = datetime.now(timezone.utc)
 
             session.commit()
 

apps/coordinator-api/src/app/services/agent_communication.py

@@ -11,7 +11,7 @@ logger = get_logger(__name__)
 import hashlib
 import json
 from dataclasses import asdict, dataclass, field
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from enum import StrEnum
 from typing import Any
 
@@ -199,7 +199,7 @@ class AgentCommunicationService:
                     messages_sent=0,
                     messages_received=0,
                     active_channels=0,
-                    last_activity=datetime.now(datetime.UTC),
+                    last_activity=datetime.now(timezone.utc),
                     average_response_time=0.0,
                     delivery_rate=0.0,
                 )
@@ -346,11 +346,11 @@ class AgentCommunicationService:
                 encryption_key=encryption_key,
                 encryption_type=encryption_type,
                 size=len(content_bytes),
-                timestamp=datetime.now(datetime.UTC),
+                timestamp=datetime.now(timezone.utc),
                 status=MessageStatus.PENDING,
                 price=price,
                 metadata=metadata or {},
-                expires_at=datetime.now(datetime.UTC) + timedelta(seconds=self.message_timeout),
+                expires_at=datetime.now(timezone.utc) + timedelta(seconds=self.message_timeout),
                 reply_to=reply_to,
                 thread_id=thread_id,
             )
@@ -395,7 +395,7 @@ class AgentCommunicationService:
                 raise ValueError(f"Message {message_id} not pending")
 
             message.status = MessageStatus.DELIVERED
-            message.delivery_timestamp = datetime.now(datetime.UTC)
+            message.delivery_timestamp = datetime.now(timezone.utc)
 
             # Update stats
             await self._update_message_stats(message.sender, message.recipient, "delivered")
@@ -426,7 +426,7 @@ class AgentCommunicationService:
 
             # Mark as read
             message.status = MessageStatus.READ
-            message.read_timestamp = datetime.now(datetime.UTC)
+            message.read_timestamp = datetime.now(timezone.utc)
 
             # Update stats
             await self._update_message_stats(message.sender, message.recipient, "read")
@@ -495,8 +495,8 @@ class AgentCommunicationService:
                 agent2=agent2,
                 channel_type=channel_type,
                 is_active=True,
-                created_timestamp=datetime.now(datetime.UTC),
-                last_activity=datetime.now(datetime.UTC),
+                created_timestamp=datetime.now(timezone.utc),
+                last_activity=datetime.now(timezone.utc),
                 message_count=0,
                 participants=[agent1, agent2],
                 encryption_enabled=encryption_enabled,
@@ -814,17 +814,17 @@ class AgentCommunicationService:
             if sender in self.communication_stats:
                 self.communication_stats[sender].total_messages += 1
                 self.communication_stats[sender].messages_sent += 1
-                self.communication_stats[sender].last_activity = datetime.now(datetime.UTC)
+                self.communication_stats[sender].last_activity = datetime.now(timezone.utc)
 
         elif action == "delivered":
             if recipient in self.communication_stats:
                 self.communication_stats[recipient].total_messages += 1
                 self.communication_stats[recipient].messages_received += 1
-                self.communication_stats[recipient].last_activity = datetime.now(datetime.UTC)
+                self.communication_stats[recipient].last_activity = datetime.now(timezone.utc)
 
         elif action == "read":
             if recipient in self.communication_stats:
-                self.communication_stats[recipient].last_activity = datetime.now(datetime.UTC)
+                self.communication_stats[recipient].last_activity = datetime.now(timezone.utc)
 
     async def _process_message_queue(self):
         """Process message queue for delivery"""
@@ -848,7 +848,7 @@ class AgentCommunicationService:
 
         while True:
             try:
-                current_time = datetime.now(datetime.UTC)
+                current_time = datetime.now(timezone.utc)
                 expired_messages = []
 
                 for message_id, message in self.messages.items():
@@ -875,7 +875,7 @@ class AgentCommunicationService:
 
         while True:
             try:
-                current_time = datetime.now(datetime.UTC)
+                current_time = datetime.now(timezone.utc)
                 inactive_channels = []
 
                 for channel_id, channel in self.channels.items():
@@ -958,7 +958,7 @@ class AgentCommunicationService:
             "messages": {k: asdict(v) for k, v in self.messages.items()},
             "channels": {k: asdict(v) for k, v in self.channels.items()},
             "templates": {k: asdict(v) for k, v in self.message_templates.items()},
-            "export_timestamp": datetime.now(datetime.UTC).isoformat(),
+            "export_timestamp": datetime.now(timezone.utc).isoformat(),
         }
 
         if format.lower() == "json":

apps/coordinator-api/src/app/services/agent_integration.py

@@ -6,7 +6,7 @@ Integrates agent orchestration with existing ML ZK proof system and provides dep
 from aitbc import get_logger
 
 logger = get_logger(__name__)
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from enum import StrEnum
 from typing import Any
 from uuid import uuid4
@@ -104,8 +104,8 @@ class AgentDeploymentConfig(SQLModel, table=True):
     last_health_check: datetime | None = Field(default=None)
 
     # Metadata
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class AgentDeploymentInstance(SQLModel, table=True):
@@ -149,8 +149,8 @@ class AgentDeploymentInstance(SQLModel, table=True):
     health_check_history: list[dict[str, Any]] = Field(default_factory=list, sa_column=Column(JSON))
 
     # Timestamps
-    created_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
-    updated_at: datetime = Field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
+    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class AgentIntegrationManager:
@@ -380,7 +380,7 @@ class AgentDeploymentManager:
 
             # Update deployment status
             config.status = DeploymentStatus.DEPLOYING
-            config.deployment_time = datetime.now(datetime.UTC)
+            config.deployment_time = datetime.now(timezone.utc)
             self.session.commit()
 
             deployment_result = {
@@ -469,7 +469,7 @@ class AgentDeploymentManager:
             instance.status = DeploymentStatus.DEPLOYED
             instance.health_status = "healthy"
             instance.endpoint_url = f"http://localhost:{instance.port}"
-            instance.last_health_check = datetime.now(datetime.UTC)
+            instance.last_health_check = datetime.now(timezone.utc)
 
             self.session.commit()
 
@@ -554,11 +554,11 @@ class AgentDeploymentManager:
 
             # Update instance health status
             instance.health_status = health_status
-            instance.last_health_check = datetime.now(datetime.UTC)
+            instance.last_health_check = datetime.now(timezone.utc)
 
             # Add to health check history
             health_check_record = {
-                "timestamp": datetime.now(datetime.UTC).isoformat(),
+                "timestamp": datetime.now(timezone.utc).isoformat(),
                 "status": health_status,
                 "response_time": response_time,
             }
@@ -582,7 +582,7 @@ class AgentDeploymentManager:
 
             # Mark as unhealthy
             instance.health_status = "unhealthy"
-            instance.last_health_check = datetime.now(datetime.UTC)
+            instance.last_health_check = datetime.now(timezone.utc)
             instance.consecutive_failures += 1
             self.session.commit()
 

apps/coordinator-api/src/app/services/agent_orchestrator.py

@@ -9,7 +9,7 @@ from aitbc import get_logger
 
 logger = get_logger(__name__)
 from dataclasses import dataclass, field
-from datetime import datetime, UTC, timedelta
+from datetime import datetime, timezone, timedelta
 from enum import StrEnum
 from typing import Any
 
@@ -58,7 +58,7 @@ class AgentCapability:
     performance_score: float  # 0-1
     cost_per_hour: float
     reliability_score: float  # 0-1
-    last_updated: datetime = field(default_factory=datetime.now(datetime.UTC))
+    last_updated: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 @dataclass
@@ -102,7 +102,7 @@ class OrchestrationPlan:
     resource_requirements: dict[ResourceType, int]
     estimated_cost: float
     confidence_score: float
-    created_at: datetime = field(default_factory=datetime.now(datetime.UTC))
+    created_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
 
 
 class AgentOrchestrator:
@@ -360,7 +360,7 @@ class AgentOrchestrator:
 
         # Process each execution stage
         for stage_idx, stage_sub_tasks in enumerate(decomposition.execution_plan):
-            stage_start = datetime.now(datetime.UTC) + timedelta(hours=stage_idx * 2)  # Estimate 2 hours per stage
+            stage_start = datetime.now(timezone.utc) + timedelta(hours=stage_idx * 2)  # Estimate 2 hours per stage
 
             for sub_task_id in stage_sub_tasks:
                 # Find sub-task
@@ -368,7 +368,7 @@ class AgentOrchestrator:
 
                 # Create assignment (will be filled during execution)
                 assignment = AgentAssignment(
-                    sub_task_id=sub_task_id, agent_id="", assigned_at=datetime.now(datetime.UTC)  # Will be assigned during execution
+                    sub_task_id=sub_task_id, agent_id="", assigned_at=datetime.now(timezone.utc)  # Will be assigned during execution
                 )
                 assignments.append(assignment)
 
@@ -469,7 +469,7 @@ class AgentOrchestrator:
             sub_task_id=sub_task_id,
             resource_type=ResourceType.GPU,
             allocated_amount=1,
-            allocated_at=datetime.now(datetime.UTC),
+            allocated_at=datetime.now(timezone.utc),
             expected_duration=requirements.estimated_duration,
         )
         allocations.append(gpu_allocation)
@@ -480,7 +480,7 @@ class AgentOrchestrator:
             sub_task_id=sub_task_id,
             resource_type=ResourceType.MEMORY,
             allocated_amount=requirements.memory_requirement,
-            allocated_at=datetime.now(datetime.UTC),
+            allocated_at=datetime.now(timezone.utc),
             expected_duration=requirements.estimated_duration,
         )
         allocations.append(memory_allocation)
@@ -568,7 +568,7 @@ class AgentOrchestrator:
                     # For now, assume agents are healthy if they have recent updates
 
                     capability = self.agent_capabilities[agent_id]
-                    time_since_update = datetime.now(datetime.UTC) - capability.last_updated
+                    time_since_update = datetime.now(timezone.utc) - capability.last_updated
 
                     if time_since_update > timedelta(minutes=5):
                         if self.agent_status[agent_id] != AgentStatus.OFFLINE:
@@ -619,7 +619,7 @@ class AgentOrchestrator:
 
         # Adjust for deadline
         if deadline:
-            time_to_deadline = (deadline - datetime.now(datetime.UTC)).total_seconds() / 3600
+            time_to_deadline = (deadline - datetime.now(timezone.utc)).total_seconds() / 3600
             if time_to_deadline < decomposition.estimated_total_duration:
                 confidence *= 0.6