fix: standardize exchange database path to use centralized data directory with environment variable

🔧 Database Path Standardization:
• Change DATABASE_URL environment variable to EXCHANGE_DATABASE_URL
• Update default database path from ./exchange.db to /var/lib/aitbc/data/exchange/exchange.db
• Apply consistent path resolution across all exchange database connections
• Update database.py, seed_market.py, and simple_exchange_api.py with new path
• Maintain backward compatibility through

scripts/workflow-openclaw/fix_agent_communication.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+# OpenClaw Agent Communication Fix
+# This script demonstrates the correct way to use OpenClaw agents with sessions
+
+set -e
+
+echo "=== OpenClaw Agent Communication Fix ==="
+
+# 1. Check OpenClaw status
+echo "1. Checking OpenClaw status..."
+openclaw status --all | head -10
+
+# 2. Create a session for agent operations
+echo "2. Creating agent session for blockchain operations..."
+SESSION_ID="blockchain-workflow-$(date +%s)"
+
+# 3. Test agent communication with session
+echo "3. Testing agent communication with proper session..."
+openclaw agent --agent main --session-id $SESSION_ID --message "Test agent communication for blockchain workflow" --thinking low
+
+echo "✅ Agent communication working with session ID: $SESSION_ID"
+
+# 4. Demonstrate agent coordination
+echo "4. Demonstrating agent coordination for blockchain operations..."
+openclaw agent --agent main --session-id $SESSION_ID --message "Coordinate multi-node blockchain deployment and provide status analysis" --thinking medium
+
+# 5. Show session information
+echo "5. Session information:"
+echo "Session ID: $SESSION_ID"
+echo "Agent: main"
+echo "Status: Active"
+
+# 6. Generate fix report
+cat > /tmp/openclaw_agent_fix_report.json << EOF
+{
+    "fix_status": "completed",
+    "issue": "Agent communication failed due to missing session context",
+    "solution": "Added --session-id parameter to agent commands",
+    "session_id": "$SESSION_ID",
+    "agent_id": "main",
+    "working_commands": [
+        "openclaw agent --agent main --session-id \$SESSION_ID --message 'task'",
+        "openclaw agent --agent main --session-id \$SESSION_ID --message 'task' --thinking medium"
+    ],
+    "timestamp": "$(date -Iseconds)"
+}
+EOF
+
+echo "✅ OpenClaw Agent Communication Fix Completed!"
+echo "📊 Report saved to: /tmp/openclaw_agent_fix_report.json"
+echo ""
+echo "=== Correct Usage Examples ==="
+echo "# Basic agent communication:"
+echo "openclaw agent --agent main --session-id $SESSION_ID --message 'your task'"
+echo ""
+echo "# With thinking level:"
+echo "openclaw agent --agent main --session-id $SESSION_ID --message 'complex task' --thinking high"
+echo ""
+echo "# For blockchain operations:"
+echo "openclaw agent --agent main --session-id $SESSION_ID --message 'coordinate blockchain deployment' --thinking medium"