[Freeswitch-users] Does nibble execute sql queries in single transaction ?

If not, is there a possibilities of reach condition where updates from multiple channels override each other. For example, 2 incoming calls at the same time to 2 different numbers, but owned by single user - that mean nibble will be updating the same record in database. I'm planning to add "FOR UPDATE" clause to the custom_sql_lookup:- SELECT cash AS nibble_balance FROM accounts WHERE account_code='${nibble_account} FOR UPDATE But if each query run inside their own transaction, that would be no use. Thank you.