Replacing a 3 GB SQLite db with a 10 MB FST (finite state transducer) binary

Note for
numberphiles:
all numbers have been rounded to their first significant
digit, because I'm a fan of Rob Eastaway's
"zequals" method
of getting to the point when it comes to estimation. It's much
more valuable to walk away with the heuristic "some dude got
a 300x memory reduction by swapping out a database he hacked
together for a tiny, static, specialized data structure that
does exactly what he needs it to and no more."