Going forwards, there's not much more. By the time we get to the Typhon Pact books (specifically DRG3's Rough Beasts
), small references make it clear that the Ascendant conflict is over by then - it happened in the gap.
However, another book by DRG3, the TOS novel Allegiance in Exile
, gives a snapshot of a Bajoran colony and its mysterious attackers in the TOS era.