fix: add non-concurrent index creation migrations

[anihamde]

This PR removes the concurrently from the migration query to add an index on creation_time to the postgres auction table. This is so that the migrations in _sqlx_migrations can remain consistent between local and the prod db.

On local, we run this migration via the normal path since we aren't worried about downtime. However, on the prod db we had to run the migration manually in psql due to the risk of significant downtime from running this query (moreover, sqlx doesn't easily support running queries concurrently).

In the prod version, we manually appended an entry to the _sqlx_migrations table with the checksum corresponding to the query file to indicate that the migration has taken place.

This PR also adds an index on the auction_id in the bid table; without this, the deletes cannot happen quickly due to the ON DELETE RESTRICT clause. Similar to above, the index was created concurrently, but the migration file shows a blocking index creation.

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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
swap-staging	⬜️ Ignored (Inspect)			Jul 31, 2025 3:55pm

[anihamde]

After merging, we should run the following two queries to add the migrations to the _sqlx_migrations table on prod:

INSERT INTO _sqlx_migrations (version, description, installed_on, success, checksum, execution_time)
VALUES (
20250726182247,
'auction creation time idx',
now(),
true,
decode('8154d649fa1c0575d15ebb7f0ac8364c356c4c2d69c4d1e02b938a7864602b89945758bd1181abdbf2fee23839c44710', 'hex'),
0
);

INSERT INTO _sqlx_migrations (version, description, installed_on, success, checksum, execution_time)
VALUES (
20250730221458,
'idx bid auction id',
now(),
true,
decode('08387a1694fb805c9dc88b5dcb1db287bad31e7ea4036dc5a043c8900581ba8a0be27297ba32fd09cd922164aeb0e99d', 'hex'),
0
);

The checksums are matched against the result of running these migrations locally.

[danimhr]

Do we need to update the migrate down file as well?