For logout: tries to deliver userID's stored shards within timeoutMs, then deletes every shard
of that user that is still stored, so their call audio neither stays on a shared browser's disk nor
waits for a later login. Other users' shards are untouched. Never rejects and never takes longer
than timeoutMs plus the delete.
For logout: tries to deliver
userID's stored shards withintimeoutMs, then deletes every shard of that user that is still stored, so their call audio neither stays on a shared browser's disk nor waits for a later login. Other users' shards are untouched. Never rejects and never takes longer thantimeoutMsplus the delete.