OutboxJournal

put(
   record, 
   now, 
   lease?
): Promise<{
  status: "created" | "exists";
  record: OutboxRecord;
}>;

begin(key, options): Promise<OutboxRecord | null>;

markSent(
   key, 
   token, 
   result, 
   now
): Promise<void>;

extend(
   key, 
   token, 
   leaseUntil
): Promise<void>;

markFailed(
   key, 
   token, 
   error, 
   options
): Promise<void>;

claimDue(options): Promise<ClaimedSend[]>;

resolveAmbiguous(
   key, 
   token, 
   to, 
   now
): Promise<void>;

get(key): Promise<OutboxRecord | undefined>;

list(filter?): Promise<OutboxRecord[]>;

retry(key, now): Promise<void>;

discard(key): Promise<void>;

purge(options): Promise<number>;