FWIW, i've never once started with sqlite and then later "upgrade" to another db. i once actually used sqlite to implement locking for a mysql db because mysql'

FWIW, i've never once started with sqlite and then later "upgrade" to another db. i once actually used sqlite to implement locking for a mysql db because mysql's locking requires (or required, back then) that the calling code specify, in advance, every table which would need locking, and that wasn't possible in that code base. So an sqlite db connection was opened just to act as a mutex for the mysql db in some code paths.