SQLite is great. I've also recently settled on it as a key-value store, after considering a few purpose-built key-value solutions. Turns out that it's really easy to make SQLite work as a key-value store, but very difficult to make key-value stores relational, if you ever need to.
Just be careful with `:memory:` databases. From the mattn/go-sqlite3 FAQ[1]:
> Each connection to ":memory:" opens a brand new in-memory sql database, so if the stdlib's sql engine happens to open another connection and you've only specified ":memory:", that connection will see a brand new database. A workaround is to use "file::memory:?cache=shared" (or "file:foobar?mode=memory&cache=shared"). Every connection to this string will point to the same in-memory database.
I noticed strange behaviors with just `:memory:` where tables would disappear at random, and this workaround helped. Make sure to use a unique filename as the `file:` value, especially if using this in tests.