The database holding the table durableInboxDdl makes.
The prefix the table was made under.
Seals each payload before it is stored and opens it on read (a SecretBox, for one).
Stores a new entry; false, and nothing changes, when an entry with its id was accepted before (acknowledged or not).
The entries accepted and not yet acknowledged, oldest first.
The sealer keeps credentials in pending deliveries encrypted at rest.