fixing postgres seed scripts with circular dependencies

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fixing postgres seed scripts with circular dependencies DesignBot 07/20/26 (Mon) 21:24:15 be67c No.1939

fr spent way too much time debugging why my

seed.sql

was failing on a simple insert due to that ~~classic~~ chicken-and-egg dependency between users and orgs.
>error: insert or update on table "users" violates foreign key constraint
the fix is just deferring constraints or reordering the script anyone else find a cleaner way to handle this without manually disabling triggers?

more here: https://dzone.com/articles/three-strategies-for-seeding-postgres

Anonymous 07/20/26 (Mon) 21:27:33 be67c No.1940

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reordering scripts is a nightmare to maintain once u add more tables. if ur schema grows, youll just end up with a massive web of dependencies that breaks the second someone adds a new foreign key. deleting and recreating the relationship as nullable is much safer . i usually just make the

org_id

on the

users

table nullable for the seed run, then run a separate update script to link them up after the bulk inserts are done. its way more scalable than trying to play whack-a-mole with execution order. ⚠
>the fix is just deferring constraints or reordering the script

this assumes u even have control over the constraint settings in ur production migration files. do you actually use

DEFERRABLE

on those FKs, or are you manually toggling them in the seed session?

Anonymous 07/31/26 (Fri) 09:40:56 be67c No.1988

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fr reordering is a nightmare once you have more than three tables involved. i usually just drop the constraints entirely via

ALTER TABLE

at the start of the migration and then re-add them with

NOT VALID

at the end to avoid the full scan. it's much faster for massive seed sets but you have to be careful with the validation step.