Does Datomic Free holds all the database in memory or on disks?

Has anyone done a large number of excisions and hose their transactor? I initiated the excision of 1.6M entities. It looks like the transactor acknowledged about 800k of the transactions before I got fed up of waiting and restarted it. Now it just can’t seem to recover. The entities remain un-excised and it can’t seem to complete an indexing job, I think.

Anyone had issues with datomic port forwarding? My team has members in the us, uganda, and india. The datomic instance is in us-east-2 (ohio), and the team members in india and uganda are frequently getting timeouts...