ref: Change EventTag writes to write in bulk #6551
Merged
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It's easily possible that this is 10+ at bare minimum, sometimes into
hundreds of tags per Event.
So changing this to a bulk write means we have 1 transaction and one big
INSERT query which should be considerable speed improvement.
We can get away with this since we currently have a UNIQUE on (event_id,
key_id, value_id), which means this is an all-or-nothing. Since each
call is bound to a single event, this single task never is called more
than once for the same event_id and expect a sum of tags. This means we
can simplify this by choosing not to handle that case at all and should
get a, theoretically, substantial boost in performance.