I’m back up and running now. Just had to restart my db machine: fly machine restart <machine-id> -a <app-name>. Here’s the post that pointed me towards this: PG machines had disruption and never came back
Note that I also updated my rails app to v2 - I’m pretty sure that wasn’t a contributing factor to my db coming back up, but posting here just in case others have issues that a machine restart doesn’t solve.