Extreme Sharding: One SQLite Database Per User

Question

I\'m working on a web app that is somewhere between an email service and a social network. I feel it has the potential to grow really big in the future, so I\'m concerned about

Answer 1

Having one database per user would make it really easy to restore individual users data of course, but as @John said, schema changes would require some work.

Not enough to make it hard, but enough to make it non-trivial.