Although #9922 was deployed to Codeberg, it was reported on Matrix that a user observed a `-1` pull request count.
@Gusted checked and verified that the stats stored in redis appeared incorrect, and that no errors occurred on Codeberg that included the repo ID (eg. deadlocks, SQL queries).
```
127.0.0.1:6379> GET Repo:CountPulls:924266
"1"
127.0.0.1:6379> GET Repo:CountPullsClosed:924266
"2"
```
One possible cause is that when `UpdateRepoIssueNumbers` is invoked and invalidates the cache key for the repository, it is currently in a transaction; the next request for that cached count could be computed before the transaction is committed and the update is visible. It's been verified that `UpdateRepoIssueNumbers` is called within a transaction in most interactions (I put a panic in it if `db.InTransaction(ctx)`, and most related tests failed).
This PR fixes that hole by performing the cache invalidation in an `AfterTx()` hook which is invoked after the transaction is committed to the database.
(Another possible cause is documented in #10127)
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10130
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net>
Co-committed-by: Mathieu Fenniak <mathieu@fenniak.net>
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