Implemented alembic migrations, added cursors closing task.

main.py

@@ -1,19 +1,27 @@
+import asyncio
 from contextlib import asynccontextmanager
-
 from fastapi import FastAPI
-
 from app import api_router
-
-from utils.scripts import pools_creator, pools_destroy, db_startup
-
-
+from utils.scripts import pools_creator, pools_destroy, db_startup, cursors_closer
+from dbs import mysql
 
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
     await pools_creator()
+    mysql.cached_cursors_cleaner_task = asyncio.create_task(mysql.cached_cursors_cleaner())
+    
     yield
+
+    mysql.cached_cursors_cleaner_task.cancel()
+    try:
+        await mysql.cached_cursors_cleaner_task
+    except asyncio.CancelledError:
+        print('Closed cached_cursors_cleaner_task')
+    await cursors_closer()
     await pools_destroy()
 
+
 app = FastAPI(lifespan=lifespan)
-app.include_router(router=api_router)
+
+app.include_router(router=api_router)