Cron-Control
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Automattic
Task: Cleanup database installation process
1) [Resolved] Ensure table truly exists
Problem: Somebody may duplicate the options table while creating a new subsite locally for example, but for some reason not copy over the cron control table. As a result, the a8c_cron_control_db_version option is set but the table doesn't exist - and will never be attempted to be created. So you end up with perpetual errors until manually resolved.
Solution: Not 100% sure, kind of tricky. This would be an ideal for a cron job to verify the table exists, maybe in an existing internal cleanup job. But uhh, cron is broken if the table isn't there. So maybe need to do a SQL query to just check that the table truly exists every once in a while? Alternatively, try to leave cron in a functional state when this happens - but that may be hard.
2) [Resolved] Cleanup overall table creation flows
There are lots of different flows for when/how a table is created, might be good to simplify a bit where possible. Of note, wpmu_new_blog is a deprecated hook that needs to be updated a minimum.
Also when the table doesn't exist yet, we just skip over the WP filters for that request. Maybe this is still ideal, but it does cause for some hacky flows in unit testing.
3) Prepare for schema changes
The plugin won't currently react very well to just incrementing the db_version option if we ever do schema updates, as it won't actually update itself.
Notably eying changing the ts_action_instance_status index to be re-ordered to action -> instance -> timestamp -> status instead allowing it to be used for action-only queries as well (which WP core has a few of).
Items 1 & 2 from above are resolved in https://github.com/Automattic/Cron-Control/pull/245.
Supporting schema changes can be dealt with when the time comes for them.
New item fresh off the press: need to actively set the charset for the table upon creation, like this: https://github.com/WordPress/WordPress/blob/69e9e78cf4b63931a3d81e7ecb3c2a0cda7a13ed/wp-admin/includes/schema.php#L64