Cleans up interface (it's now a command line option) and renames project to "sqlcache" in the all-one-word style. Still has issues to do with concurrency, retrying transactions, and foreign function calls that either rely on state or have side effects.

table t : { A : int, B : string }
table u : { A : int, C : float }

val q : sql_query [] [T = [A = int, B = string], U = [C = option float]] [] =
    (SELECT t.A, t.B, u.C
     FROM {{sql_left_join (FROM t) (FROM u) (WHERE TRUE)}})