Add different database options

[nxtkofi]

enforcing JSON as a db is questionable, would love to see it being compatible with sqlite so that it can be contained in a single file

[Kamyil]

JSON is only the data format here, your DB is your machine tbf - we store each day in each file, since this app was mostly designed for very simple, day-to-day usage with some kind-of data persistent storage. Hence this is why there are multiple files

But you're right that storing these data in something like SQLite would be hugely beneficial. We could probably build some weeek/month summaries based on that in future or give people an ability to run their own queries based on that

I will add that idea to v0.3 or v0.4 milestone