Store::get_values reads a set of keys in one round trip on PostgreSQL
(k = ANY($1)) and falls back to one get_value per key elsewhere. A
replicated store serves the batch from a replica and re-reads from the
primary the keys the replica has not received yet.
IMAP FETCH and STORE, JMAP Email/get and the message and mailbox cache
refreshers that every node runs after a write now read their archives
READ_BATCH_SIZE (128) at a time instead of one round trip per message.
FETCH also prefetches the message data of the messages it is about to
mark \Seen, saving the second round trip per message.
jcoffey-dev