Wrap energy decr in transaction

batcher/app/src/domain/click/repos/pg.py

@@ -18,7 +18,7 @@ async def store(conn: Connection, click: Click) -> int:
 async def delete_user_info(conn: Connection, user_id: int):
     async with conn.transaction():
         await conn.execute('DELETE FROM clicks WHERE user_id=$1', user_id)
-        await conn.execute('DELTE FROM users WHERE id=$1', user_id)
+        await conn.execute('DELETE FROM users WHERE id=$1', user_id)
 
 
 async def get_period_sum(conn: Connection, user_id: int, period: int) -> decimal.Decimal:
@@ -65,6 +65,7 @@ async def get_energy(conn: Connection, user_id: int) -> int:
 
 
 async def decr_energy(conn: Connection, user_id: int, amount: int) -> Tuple[int, int]:
+    async with conn.transaction(isolation='serializable'):
         new_energy, spent = await conn.fetchrow('''
             WITH energy_cte AS (
                 SELECT energy, (CASE WHEN energy < $2 THEN energy ELSE $2 END) AS delta FROM users WHERE id=$1