* make sending confirmation asynchronous
* confirm first queue synchronously (on JOIN, and delete connection on failure), second queue asynchronously (from REPLY msg)
* test to retry JOIN when the first attempt fails
* process confirmation delivery errors
* database migrations
* fix: reverse order of down migrations
* use positional parameters in queries
* simplify migrations
* typo
* rename SchemaMigration to Migration
* move store initialization to IO monad
John Roberts