fix: 3 user deletion bugs — type cast, inner savepoint, lazy load

1. connected_squads JSON stores IDs as strings but server_squads.id is
   integer — cast to int before passing to remove_user_from_servers
2. Wrap remove_user_from_servers in its own db.begin_nested() so its
   failure doesn't abort the parent savepoint (subscription deletion)
3. Pre-fetch admin.id before delete_user_account to avoid MissingGreenlet
   when transaction rollback expires the ORM object

app/cabinet/routes/admin_users.py

@@ -1771,15 +1771,18 @@ async def full_delete_user(
     panel_error: str | None = None
     deleted_from_panel = False
 
+    # Pre-fetch admin.id to avoid MissingGreenlet after transaction rollback
+    admin_id_val = admin.id
+
     # UserService.delete_user_account handles both bot DB and Remnawave panel
     user_service = UserService()
-    success = await user_service.delete_user_account(db, user_id, admin.id)
+    success = await user_service.delete_user_account(db, user_id, admin_id_val)
 
     if success:
         deleted_from_panel = request.delete_from_panel and user.remnawave_uuid is not None
 
     reason_text = f' (reason: {request.reason})' if request.reason else ''
-    logger.info('Admin fully deleted user', admin_id=admin.id, user_id=user_id, reason_text=reason_text)
+    logger.info('Admin fully deleted user', admin_id=admin_id_val, user_id=user_id, reason_text=reason_text)
 
     return FullDeleteUserResponse(
         success=success,

app/services/user_service.py

@@ -1194,7 +1194,12 @@ class UserService:
                             try:
                                 from app.database.crud.server_squad import remove_user_from_servers
 
-                                await remove_user_from_servers(db, squad_ids)
+                                # JSON may store IDs as strings — cast to int
+                                int_squad_ids = [int(sid) for sid in squad_ids if sid]
+                                if int_squad_ids:
+                                    # Own savepoint so failure doesn't abort subscription deletion
+                                    async with db.begin_nested():
+                                        await remove_user_from_servers(db, int_squad_ids)
                             except Exception as sq_err:
                                 logger.warning('⚠️ Не удалось уменьшить счётчик серверов', error=sq_err)