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JakobDev 14731a34ff
Add index to `issue_user.issue_id` (#27154)
This fixes a performance bottleneck. It was discovered by Codeberg.
Every where query on that table (which has grown big over time) uses
this column, but there is no index on it.

See this part of the log which was posted on Matrix:
```
2023/09/10 00:52:01 ...rs/web/repo/issue.go:1446:ViewIssue() [W] [Slow SQL Query] UPDATE `issue_user` SET is_read=? WHERE uid=? AND issue_id=? [true x y] - 51.395434887s
2023/09/10 00:52:01 ...rs/web/repo/issue.go:1447:ViewIssue() [E] ReadBy: Error 1205 (HY000): Lock wait timeout exceeded; try restarting transaction
2023/09/10 00:52:01 ...eb/routing/logger.go:102:func1() [I] router: completed GET /Codeberg/Community/issues/1201 for [::ffff:xxx]:0, 500 Internal Server Error in 52384.2ms @ repo/issue.go:1256(repo.ViewIssue)
```
10 months ago
..
main_test.go Support changing labels of Actions runner without re-registration (#24806) 1 year ago
v260.go Fix description of drop custom_labels migration (#25243) 1 year ago
v261.go Support configuration variables on Gitea Actions (#24724) 1 year ago
v262.go Support `pull_request_target` event (#25229) 1 year ago
v263.go Rename `Sync2` -> `Sync` (#26479) 11 months ago
v264.go Drop the correct deleted branch table (#26028) 11 months ago
v265.go Actions Artifacts support uploading multiple files and directories (#24874) 12 months ago
v266.go Remove commit status running and warning to align GitHub (#25839) 12 months ago
v267.go Reduce unnecessary DB queries for Actions tasks (#25199) 12 months ago
v268.go Implement auto-cancellation of concurrent jobs if the event is push (#25716) 11 months ago
v269.go Drop the correct deleted branch table (#26028) 11 months ago
v270.go Fix typo in metadata (#26207) 11 months ago
v271.go Allow to archive labels (#26478) 11 months ago
v272.go Add optimistic lock to ActionRun table (#26563) 11 months ago
v273.go chore(actions): support cron schedule task (#26655) 10 months ago
v274.go Artifacts retention and auto clean up (#26131) 10 months ago
v275.go Add a new column schedule_id for action_run to track (#26975) 10 months ago
v276.go Fix wrong xorm get usage on migration (#27111) 10 months ago
v277.go Add index to `issue_user.issue_id` (#27154) 10 months ago