PG Bug reporting form <noreply@postgresql.org> writes:
> PgManager giving error while looking a table with PgV12.
> Error: column "consrc" does not exist.
Evidently PgManager needs to be updated to work with PG 12 ...
or, really, prior versions too, because that column was
deprecated for a long time before we finally removed it.
Use of the pg_get_constraintdef() function is preferable.
You'll need to pester the author of PgManager to fix it.
regards, tom lane