Bump DB version to 79 since synapse v1.88 was already there

[MatMaul]

We accidentally removed 79 deltas folder and version bump with a revert.

The 2 applied deltas of the reverted commit will stayed applied, meaning that we don't have the NOT NULL constraint on user_id column of tables profiles and user_filters.
I think this is fine, but tagging you @H-Shay to have an extra pair of eyes on that.

Pull Request Checklist

• Pull request includes a changelog file.
• Pull request includes a sign off
• Code style is correct
  (run the linters)

[erikjohnston]

@MatMaul Can I check that the delta files you moved are safe to run twice?

[MatMaul]

@erikjohnston you mean you or me ? Feel free to check I am not rushing this change and will probably delay a bit the RC.

If you mean me welllll I had a quick look and I am not sure I am qualified to say 😅

[H-Shay]

that we don't have the NOT NULL constraint on user_id column of tables profiles and user_filters

I think this should be fine? We have stopped reading from these columns entirely and next release will stop writing to them in preparation to be dropped so I think it should be fine.

[MatMaul]

@H-Shay that's what I thought, thanks for having a look.

@erikjohnston after looking more carefully I found quite a bunch of trouble regarding re-run of those deltas, I think I catch them all, if you can have a quick look.