[GENERAL] COMMIT TRIGGER implementation using CONSTRAINT TRIGGERs - Mailing list pgsql-general

I've written an approximation of "commit triggers" for PostgreSQL using
CONSTRAINT TRIGGERs (as users have often been told to do who want this
feature).

Semantics (and a warning) are included in commentary in the source:

https://github.com/twosigma/postgresql-contrib/
https://github.com/twosigma/postgresql-contrib/blob/master/commit_trigger.sql
https://raw.githubusercontent.com/twosigma/postgresql-contrib/master/commit_trigger.sql

I suspect a number of users here may find this useful.

I've also posted separately to pgsql-hackers to see if we can get
agreement that commit triggers are a reasonable and desirable feature.

Cheers,

Nico
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