According to BCMR spec, if bare domains are un op_return, we should look
up "well known" path for the domain.
Fallback to previous behaviour if well known is not found.
This makes the application fully async; freeing web server threads to
handle new connections when waiting on SQL queries.
Additionally sqlx will allow easier move to a different database if
needed in the future.
Includes some SQL optimizations as well (slow queries more easliy identifiable
with sqlx).
