# X_DB_SCHEMA_UNDECLARED

## Means

a migration records schema no entity declares

## Typical cause

the other direction, and a different repair: the database carries a constraint, column or index the entities no longer ask for. Reported separately from `X_DB_SCHEMA_UNMIGRATED` because "your database is missing this" and "your last generation lost something" are not one finding

## Fix

delete the stale declaration, or `bun run x -- db gen "drop what the entities no longer declare"` if the removal is intended

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