What the default jdbc connections pool size in datomic peer lib?

I don't even think the datomic need to use the common conn pool to manage DB backend.

Do you guys have plans to support DAX for DynamoDB?

Say, am I correct that the only difference between :db.unique/identity and :db.unique/value is that :db.unique/value will throw an exception when I try to assert a new entity with an existing value, whereas :db.unique/identity will do an upsert (merge the new attributes into the existing entity)?

do unique values of type ref give me a single value instead of a set when doing the reverse lookup?

(But I had to try it to find out)