fix trigger creation bug

backend/database_init.py

@@ -28,11 +28,36 @@ def init_database():
     print(f"📍 Database URL: {database_url}")
     
     try:
-        # Create all tables
+        # Create all tables first
         print("📊 Creating tables...")
         Base.metadata.create_all(bind=engine)
         print("✅ Tables created successfully")
         
+        # Verify critical tables exist before creating triggers
+        print("🔍 Verifying tables exist...")
+        with engine.connect() as connection:
+            # Check if products and products_history tables exist
+            products_exists = connection.execute(text("""
+                SELECT EXISTS (
+                    SELECT 1 FROM information_schema.tables 
+                    WHERE table_name = 'products'
+                );
+            """)).scalar()
+            
+            history_exists = connection.execute(text("""
+                SELECT EXISTS (
+                    SELECT 1 FROM information_schema.tables 
+                    WHERE table_name = 'products_history'
+                );
+            """)).scalar()
+            
+            if not products_exists:
+                raise Exception("Products table was not created")
+            if not history_exists:
+                raise Exception("Products history table was not created")
+                
+            print("✅ Required tables verified")
+        
         # Create triggers (if not already created by event listener)
         print("⚙️ Ensuring triggers are created...")
         with engine.connect() as connection:

backend/models.py

@@ -199,10 +199,10 @@ class ProductHistory(Base):
     operation = Column(String(1), nullable=False)  # 'U' for Update, 'D' for Delete
     archived_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
 
-# Create trigger after ProductHistory table is created
-@event.listens_for(ProductHistory.__table__, 'after_create')
-def create_products_versioning_trigger(target, connection, **kw):
-    """Create the products versioning trigger after the history table is created"""
+# Create trigger after ALL tables are created
+@event.listens_for(Base.metadata, 'after_create')
+def create_products_versioning_trigger_after_all_tables(target, connection, **kw):
+    """Create the products versioning trigger after all tables are created"""
     try:
         connection.execute(text(PRODUCTS_VERSIONING_TRIGGER_SQL))
         print("✅ Products versioning trigger created successfully")