V68 used to set the role's password in a versioned migration, which Flyway
applies exactly once per database. Rotating GRAFANA_DB_PASSWORD therefore
had no effect on the DB role — operators would need a manual ALTER ROLE
or a `flyway repair` that nobody documented. The shape conflated two
lifecycles: schema migration (one-shot, immutable) and credential
provisioning (rotatable).
Split into:
- V68 (versioned, immutable): creates the role and applies SELECT grants
on audit_log, documents, transcription_blocks.
- R__grafana_reader_password.sql (repeatable): issues ALTER ROLE … PASSWORD
with the placeholder. Flyway computes the checksum on the resolved
content, so any change to GRAFANA_DB_PASSWORD changes the checksum and
re-applies the migration on the next boot. Rotation becomes "bump env
var + restart backend".
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
c282f38170