Fix https://github.com/go-gitea/gitea/pull/29874#discussion_r1542227686
- The migration of v292 will miss many projects. These projects will
have no default board. This PR introduced a new migration number and
removed v292 migration.
- This PR also added the missed transactions on project-related
operations.
- Only `SetDefaultBoard` will remove duplicated defaults but not in
`GetDefaultBoard`
On creation of an empty project (no template) a default board will be
created instead of falling back to the uneditable pseudo-board.
Every project now has to have exactly one default boards. As a
consequence, you cannot unset a board as default, instead you have to
set another board as default. Existing projects will be modified using a
cron job, additionally this check will run every midnight by default.
Deleting the default board is not allowed, you have to set another board
as default to do it.
Fixes#29873Fixes#14679 along the way
Fixes#29853
Co-authored-by: delvh <dev.lh@web.de>
