Further optimize sql insertion

This changeset tries to reduce the number of batch insertions
by increasing the size of the event queues.

To avoid that low-traffic schemas have to wait for a long time
until the queue is full, schema queues whose first and last
events are more than 5 minutes apart, are flushed to insertion
as well.

Bug: T98588
Change-Id: I7804f83dfaa6fd824b9641e13240518eb430cde1