fix(db): Prevent data loss by temporarily disabling db:convert-type

[joshtrichards]

WARNING: Needed until #45257 is addressed to prevent data loss

• Targets but does not handle [Bug]: occ db:convert-type broken since PrimaryReadReplicaConnection support added #45257

Summary

Currently the bug described in #45257 (and related #45097) has a serious side effect/interaction with the occ db:convert-type command which results in dropping the source database.

Based on preliminary analysis, this is likely a bug arising from changes made in #41998 that were released as part of 29.0.0.

If we're unable to address #45257 prior to the release of 29.0.1 in a few days, then I propose we disable occ db:convert-type temporarily (hopefully just until the next maintenance release) rather than risk people wiping out their database. That is the purpose of this PR.

This is a backup PR which I propose merging in master and backporting to 29.0.1 prior to it being published if necessary.

If it turns out to be unnecessary, all the better.

TODO

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[joshtrichards]

/backport to stable29

[szaimen]

Hi, can this be reverted now that #45013 is merged?

[AndyScherzinger]

@Altahrim @come-nc @ChristophWurst -> #45400 (comment)

[ChristophWurst]

lib/private/DB/ConnectionFactory.php hasn't been touched so I assume it's still happening. @szaimen can you test?

[CorneliousJD]

Checking in to see if there's an update to this at all -- I have a need to convert from a problematic mariadb install that keeps continually corrupting my oc_filescache table and move to PostgreSQL instead.

Just about every week I have data corruption on my mariadb -- looking to convert ASAP and was sad to see the command is currently disabled.

Is there any specific override or anything that I could try knowing that I need backups first?

[techsolo12]

Hello together,

any news on this PR? We still can't migrate databases to other types. Please add a addional override like "--force" or something else.