Make 1 query instead of 50

[ApolloFortyNine]

SELECT DISTINCT beatmap_id FROM beatmaps b WHERE b.beatmap_id NOT IN (SELECT beatmap_id FROM beatmap_info)

There may be a way, similar to the above, to write one query that does the work of all 50.

[ApolloFortyNine]

Or maybe use many and statements, like ((beatmap_id == x[0].beatmap_id & enabled_mods == x[0].enabled_mods) & (beatmap_id == x[1].beatmap_id & enabled_mods == x[1].enabled_mods))

Though it may return too many at one time, using too much memory. yield_per might be useful here.

[ApolloFortyNine]

Same as #81