Use DoubleField for the stats ts, duration and started columns. On PG & MySQL the old FloatField was a 32-bit-shitter which lost a lot of seconds of precision. Existing PG/MySQL tables will need to run the SQL below to migrate OR just drop the tables and allow them to be rebuilt next run. SQLite was not affected. Fixes #909.
-- Postgres
alter table "huey_event" alter column "ts" type double precision;
alter table "huey_event" alter column "duration" type double precision;
alter table "huey_inflight" alter column "started" type double precision;
-- MySQL
alter table `huey_event` modify `ts` double not null;
alter table `huey_event` modify `duration` double;
alter table `huey_inflight` modify `started` double not null;