docs: update CLI command syntax across workflow documentation

- Updated marketplace commands: `marketplace --action` → `market` subcommands
- Updated wallet commands: direct flags → `wallet` subcommands
- Updated AI commands: `ai-submit`, `ai-status` → `ai submit`, `ai status`
- Updated blockchain commands: `chain` → `blockchain info`
- Standardized command structure across all workflow files
- Affected files: MULTI_NODE_MASTER_INDEX.md, TEST_MASTER_INDEX.md, multi-node-blockchain-marketplace

apps/coordinator-api/src/app/database.py

@@ -5,13 +5,28 @@ from sqlmodel import SQLModel, create_engine
 
 from .config import settings
 
-# Create database engine using URL from config
-engine = create_engine(
-    settings.database_url,
-    connect_args={"check_same_thread": False} if settings.database_url.startswith("sqlite") else {},
-    poolclass=StaticPool if settings.database_url.startswith("sqlite") else None,
-    echo=settings.test_mode,  # Enable SQL logging for debugging in test mode
-)
+# Create database engine using URL from config with performance optimizations
+if settings.database_url.startswith("sqlite"):
+    engine = create_engine(
+        settings.database_url,
+        connect_args={
+            "check_same_thread": False,
+            "timeout": 30
+        },
+        poolclass=StaticPool,
+        echo=settings.test_mode,  # Enable SQL logging for debugging in test mode
+        pool_pre_ping=True,  # Verify connections before using
+    )
+else:
+    # PostgreSQL/MySQL with connection pooling
+    engine = create_engine(
+        settings.database_url,
+        pool_size=10,  # Number of connections to maintain
+        max_overflow=20,  # Additional connections when pool is exhausted
+        pool_pre_ping=True,  # Verify connections before using
+        pool_recycle=3600,  # Recycle connections after 1 hour
+        echo=settings.test_mode,  # Enable SQL logging for debugging in test mode
+    )
 
 
 def create_db_and_tables():