Switched to just using transact-async to avoid peer timeout, no tx batching

That way we can add row-level meta data to the txs

postgres2datomic.core=> (do (require (ns-name *ns*) :reload-all)(time (main "mdl_user")))
"count all records with idnumber"
[[55867]]
"Elapsed time: 195041.241 msecs"