Cleanup indicies

[mdashlw]

Before you begin

• I understand my contributions may be rejected for any reason
• I understand my contributions are for the benefit of Derpibooru and/or the Philomena software
• I understand my contributions are licensed under the GNU AGPLv3

• I understand all of the above

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Requires a total reindex. WIP PR until we decide to do that

• Removes unused fields
• Adds updated_at to comments
• Adds thumbnail_id and spoiler_warning to galleries
• Removes watcher_ids from galleries
• Adds scratchpad to images
• Adds deleted_by_user_id, deleted_by_user, and deletion_reason to posts & comments
• Adds author to anon posts & comments
• Simplifies namespaced_tags on images
• Adds destroyed_content to posts & comments

Closes #517 and #519

[liamwhite]

Should this be marked as draft so it doesn't get merged unintentionally?

[Meow]

Merging blocked until we're ready to update the boorus, aka until Debian Trixie is released (june-august time window).

[MareStare]

Merging blocked until we're ready to update the boorus, aka until Debian Trixie is released (june-august time window).

Could you elaborate on why this change is blocked by updating the underlying OS?

[Meow]

It's not blocked by the update itself, but by the logistics required to deploy it. Basically to deploy this and the other indexing change, I'd have to delete all search indices and reindex anew, something that has to be done while the site is offline and will take 45-60 minutes. Since a debian distro version upgrade requires a host reboot and some downtime too, why not just combine the two into one big downtime.

[MareStare]

I see, that makes sense. @mdashlw do you think reindexing is actually required after this PR is merged? I haven't looked into it closely yet, so I'm just asking. What if we merge this PR and don't do a reindex, does it mean the boorus become more broken than they are today, or not? If not, then merging should be harmless

[Meow]

It would require a reindex lest things will be hilariously broken.

[liamwhite]

do you think reindexing is actually required after this PR is merged?

lest things will be hilariously broken

To be specific, the changes are incompatible (namespaced_tags structure vs tags).