Test database schema stability

[michaelsproul]

Proposed Changes

This PR implements some heuristics to check for breaking database changes. The goal is to prevent accidental changes to the database schema occurring without a version bump.

Additional Info

For example, this test would fail on the following PRs, forcing a schema change/test update:

• Implement basic validator custody framework (no backfill) #7578 (already merged, broke the schema)
• Custody persist fix #7661 (v26 added to prevent breakage)
• Data column custody info #7648 (needs a schema increment, probably v27)

[jimmygchen]

Nice!

[mergify]

This pull request has been removed from the queue for the following reason: pull request manually updated.

The pull request #7669 has been manually updated.

You can check the last failing draft PR here: #7671.

If you want to requeue this pull request, you can post a @mergifyio requeue comment.

[mergify]

This pull request has been removed from the queue for the following reason: checks failed.

The merge conditions cannot be satisfied due to failing checks:

• ☑️ test-suite-success

You can check the last failing draft PR here: #7672.

You may have to fix your CI before adding the pull request to the queue again.
If you update this pull request, to fix the CI, it will automatically be requeued once the queue conditions match again.
If you think this was a flaky issue instead, you can requeue the pull request, without updating it, by posting a @mergifyio requeue comment.