Add comprehensive DEBUG traces to startup process for HF troubleshooting

backend/app.py

@@ -67,35 +67,61 @@ app.include_router(observability.router)
 @app.on_event("startup")
 async def startup_event():
     """Start background services on app startup"""
+    print("🚨 DEBUG: startup_event() called")
     logger.info("✅ Backend server starting...")
     
     # 🔧 Create necessary directories
+    print("🚨 DEBUG: About to ensure directories")
     ensure_directories()
     logger.info("📁 Directory structure created")
+    print("🚨 DEBUG: Directory structure created")
     
     # 🗄️ Initialize database on startup
+    print("🚨 DEBUG: About to initialize database")
     try:
         from backend.database.init_db import init_database
         from backend.database import init_db, test_database_connection, add_sample_data_for_hf
         
+        print("🚨 DEBUG: Imported database functions")
+        
+        print("🚨 DEBUG: Calling init_database")
         init_database(reset=False, force=False)
+        print("🚨 DEBUG: init_database completed")
+        
+        print("🚨 DEBUG: Calling init_db")
         init_db()  # Create tables using SQLAlchemy
+        print("🚨 DEBUG: init_db completed")
         
         # Show database type info
-        if os.getenv("SPACE_ID"):
+        space_id = os.getenv("SPACE_ID")
+        print(f"🚨 DEBUG: SPACE_ID = {space_id}")
+        
+        if space_id:
             logger.info("🔒 HF Spaces: Using in-memory database for user privacy")
             logger.info("📝 Note: Data will be cleared when container restarts")
+            print("🚨 DEBUG: Detected HF Spaces environment")
             
             # Test database connection first
             logger.info("🔍 Testing database connection...")
+            print("🚨 DEBUG: About to test database connection")
             
             # Add sample data for HF Spaces
             logger.info("📊 Loading sample data for demonstration...")
-            add_sample_data_for_hf()
+            print("🚨 DEBUG: About to call add_sample_data_for_hf()")
+            try:
+                add_sample_data_for_hf()
+                print("🚨 DEBUG: add_sample_data_for_hf() completed without error")
+            except Exception as e:
+                print(f"🚨 DEBUG: add_sample_data_for_hf() failed with error: {e}")
+                import traceback
+                print("🚨 DEBUG: Full traceback:")
+                traceback.print_exc()
         else:
             logger.info("💾 Local development: Using persistent database")
+            print("🚨 DEBUG: Detected local development environment")
             
         logger.info("🗄️ Database initialized successfully")
+        print("🚨 DEBUG: Database initialization completed")
     except Exception as e:
         logger.error(f"❌ Database initialization failed: {e}")
         import traceback