colouring-montreal/migrations/009.user-deleted.down.sql
Maciej Ziarkowski 1901ebad42 Add user delete database migrations
Apart from adding the delete-related columns, this migration replaces
the existing unique constraint on the username with a unique index
which has a WHERE clause, so that deleted usernames need not be unique.
This is to avoid having to implement a special function for generating
unique IDs just to keep the deleted username unique and under 30 chars.
The deleted username can still use e.g. the initial part of the user_id
but the uniqueness is not required.
2019-08-16 11:12:18 +01:00

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SQL

ALTER TABLE users DROP COLUMN IF EXISTS is_deleted;
ALTER TABLE users DROP COLUMN IF EXISTS deleted_on;
DROP INDEX IF EXISTS users_username_idx;
ALTER TABLE users ADD CONSTRAINT users_username_key UNIQUE (username);