Think about replacing sqlite

[eggpi]

We don't really seem to need SQL at all for this app. The only query we ever make is "give me all devices by a user", where we don't even expect a single user to have many devices.

One idea that was tossed around was just using a file for each user, where we serialize their devices as JSON. I'm filing this bug so we can continue discussing/experimenting on this.

[nikhilm]

file would work, as would redis.