This change is motivated by 5e300a2a87
- Drop the `updated_by` and `commit_id` column, they are unused and have a index for no reason.
- Drop the index on `status` and `created_unix` and make a index on `(user_id, status)`.
## Test
1. Run migration.
2. Confirm the migration succeeds.
3. Check that `notification` table has the correct indexes.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/9926
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>
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