fix: use db.engine instead of deprecated db.get_engine()

app/__init__.py

@@ -22,7 +22,7 @@ def _migrate_db(app):
     conn.close()
 
     with app.app_context():
-        engine = db.get_engine()
+        engine = db.engine
         if "motor_vehicle_id" not in columns:
             with engine.connect() as conn:
                 conn.execute(sa.text(