SQLite has a wal hook which calls you back every time a transaction is committed to the WAL. https://www.sqlite.org/c3ref/wal_hook.html

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ncruces 3 hours ago | parent [-]

That only catches changes made by the database connection being "hooked."

This has a thread running in the background trying to catch changes made by other connections, potentially (I'm not sure here, but I suspect as much) in different processes that are modifying the same database.

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billywhizz 2 hours ago | parent [-]

good point. but ime and as seems to be widely understood writing from multiple connections is a bit of a minefield in SQLite. and afaik it still would be possible to have a hook on all connections you expect to be writing?

	▲	billywhizz 22 minutes ago \| parent [-]
		i did a quick benchmark on this with a single db connection updating user_version in a tight loop with the wal_hook callback enabled. on my crappy old i5 with the db file on /dev/shm it can do ~150k writes a second with the wal_hook callback called on every write. and this is using JS bindings to C++ so has some unnecessary overhead.