This patch changes the requeue behaviour to requeue messages that are 30 seconds past their retry time.
Batching now includes messages that are any amount past their retry time.
This change avoids batching messages before theur graylisting time, but maintains efficient batching.
* Update mysql2 query call to cast booleans
* Treat messages:held field as boolean
* Treat messages:inspected field as boolean
* Treat messages:spam field as boolean
* Treat messages:threat field as boolean
* Treat messages:bounce field as boolean
* Treat messages:received_with_ssl field as boolean
* Treat deliveries:sent_with_ssl field as boolean