async fn resolve_boundary(
services: &State,
room_id: &RoomId,
event_id: Option<&EventId>,
ts: Option<MilliSecondsSinceUnixEpoch>,
) -> Result<PduCount>Expand description
Resolves the exclusive purge boundary from the boundary event or timestamp, erroring when neither is given, the event is unknown or belongs to another room, or no event precedes the timestamp.