REFACTOR external service and improve websocket training

services/training/app/core/database.py

@@ -15,8 +15,16 @@ from app.core.config import settings
 
 logger = structlog.get_logger()
 
-# Initialize database manager using shared infrastructure
-database_manager = DatabaseManager(settings.DATABASE_URL)
+# Initialize database manager with connection pooling configuration
+database_manager = DatabaseManager(
+    settings.DATABASE_URL,
+    pool_size=settings.DB_POOL_SIZE,
+    max_overflow=settings.DB_MAX_OVERFLOW,
+    pool_timeout=settings.DB_POOL_TIMEOUT,
+    pool_recycle=settings.DB_POOL_RECYCLE,
+    pool_pre_ping=settings.DB_POOL_PRE_PING,
+    echo=settings.DB_ECHO
+)
 
 # Alias for convenience - matches the existing interface
 get_db = database_manager.get_db