Deletes rows past a retention window from a table on the shared Postgres
server. Written for sysmon's check_history, which grows with every
monitoring check and had no retention at all despite the docs promising
a 30-day rolling window.
Connects with the Scheduler's own credentials and overrides only the
database name, so no second set of secrets enters the stack. The target
database grants scheduler_user just SELECT and DELETE on the table, so a
bug here can drop old rows but cannot corrupt or forge history.
Table and column names cannot be bound as query parameters, so both are
validated against a strict identifier pattern before interpolation, and
a retention window below 1 day is refused rather than silently emptying
the table.
Co-Authored-By: Claude <noreply@anthropic.com>
