# X_DB_COMMIT_UNKNOWN

## Means

the connection was lost while COMMIT was in flight

## Typical cause

the socket closed after COMMIT was sent and before the server answered, so the transaction is either durable or rolled back and this process cannot tell which; neither onCommit effects nor onRollback undos ran. Only the data can say which: a row the transaction wrote is present if it committed and absent if it did not

## Fix

`psql "$DATABASE_URL"` — a session on that database: select a row the transaction wrote, and re-run the unit of work only when it is absent

[Entity and database](/error-codes#entity-and-database)