Add some randomness to the user specified timeout on event streams to mitigate against thundering herds problems

Handle if get_missing_pdu returns 400 or not all events.

Slightly reduce the insane amounts of indentation in main http server response path, by 'continue'ing around a non-match or falling through

Schema versioning

Twisted adbapi wrapped connections aren't context managers.

Application services exclusive flag support

Batched get pdu

Add config option to set the soft fd limit on start

Federation rate limit

Process transactions serially.