Batch Inserts and Upserts

I would like to have the posibility to perform batch inserts.
Right now every record gets inserted/upserted into the database one by one, this can be a performance bottleneck if too many records are produced.
Its basically the same as a SQL query inside a loop.

A batch inserter mechanism could collect up to N records and also wait up to X seconds before sending the query to the database anyway. Whichever case happens first, so there is not a batch "forever" in the waiting to be sent to the DB, it gets flushed at least at some point.

I'll provide a example implementation.