* Ensure the input API only uses a single transaction
* Remove more of the dead query API call
* Tidy up
* Fix tests hopefully
* Don't do unnecessary work for rooms that don't exist
* Improve error, fix another case where transaction wasn't used properly
* Add a unit test for checking single transaction on RS input API
* Fix logic oops when deciding whether to use a transaction in storeEvent
* Check that we have a populated state snapshot when determining if we closed the gap
* Do the same in the query API
* Use HasState more opportunistically
* Try to avoid falling down the hole of using a trustworthy but empty state snapshot for non-create events
* Refactor missing state and make sure that we really solve the problem for the new event
* Comments
* Review comments
* Tweak that check again
* Tidy up that create check further
* Fix build hopefully
* Update sendOutliers to use OrderAuthAndStateEvents
* Don't go out of bounds on missingEvents
* Add transaction to all database tables in roomserver, rename latest events updater to room updater, use room updater for all RS input
* Better transaction management
* Tweak order
* Handle cases where the room does not exist
* Other fixes
* More tweaks
* Fill some gaps
* Fill in the gaps
* good lord it gets worse
* Don't roll back transactions when events rejected
* Pass through errors properly
* Fix bugs
* Fix incorrect error check
* Don't panic on nil txns
* Tweaks
* Hopefully fix panics for good in SQLite this time
* Fix rollback
* Minor bug fixes with latest event updater
* Some review comments
* Revert "Some review comments"
This reverts commit 0caf8cf53e62c33f7b83c52e9df1d963871f751e.
* Fix a couple of bugs
* Clearer commit and rollback results
* Remove unnecessary prepares
