Still not testing the web code path but ... types and stuff!@

Connections could probably be in a per-thread cache or something but
redemption costs are going to dwarf database opening costs.

Also, filesystem caches and no benchmarks and all that.

A separate connection per concurrent transaction is required.

transaction rollback logic relied on exceptions, stripe charge function
signaled failure with Either, thus stripe failues had no effect on transaction
rollback

`catch` is not a good way to assert something is thrown