Add application file

main.py

@@ -20,9 +20,13 @@ db = None
 @asynccontextmanager
 async def lifespan(app):
     global db
-    db = Database()  # Initialize database connection
-    yield
-    db.conn.close()  # Close connection on shutdown
+    try:
+        db = Database()  
+        yield
+    finally:
+        if db:
+            db.conn.close() 
+
 
 app.router.lifespan_context = lifespan