Allow running across all rooms.

[erikjohnston]

Currently the tool is per room, which makes it hard to run as a periodic background task to clean out the database, or as a one-shot "reduce db size" tool.

Related: https://github.com/matrix-org/rust-synapse-compress-state/issues/6

[starcraft66]

Are there any plans to implement this feature in the near future? I'd like to run this program on my server but I have hundreds of rooms and I have no way of knowing which ones are bloating the database the most.

[aaronraimist]

@starcraft66 https://github.com/matrix-org/synapse/wiki#what-are-the-biggest-rooms-on-my-server will be helpful

[starcraft66]

@aaronraimist thanks for the suggestion, I'm running the query right now!