//TODO

 - return subscribtions in list-channels (?)

 - migration script for existing data

 - ack/read deliveries && return ack-count  (? or not, how to query?)

 - full-text-search: https://www.sqlite.org/fts5.html#contentless_tables

 - app-store link in HTML

 - route to re-check all pro-token

 - tests

 - deploy