**Backport:** https://codeberg.org/forgejo/forgejo/pulls/6591
Using SELECT `%s` FROM `%s` WHERE 0 = 1 to assert the existence of a column is simple but noisy: it shows errors in the migrations that are confusing for Forgejo admins because they are not actual errors.
Use introspection instead, which is more complicated but leads to the same result.
Add a test that ensures it works as expected, for all database types. Although the migration is run for all database types, it does not account for various scenarios and is never tested in the case a column does not exist.
Refs: https://codeberg.org/forgejo/forgejo/issues/6583
Co-authored-by: Earl Warren <contact@earl-warren.org>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6594
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
Co-committed-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
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