Add guide on how to create custom backends

[thomafred]

Hi there,

I am looking at writing a new backend, but am a little unsure where to begin.

It would be really nice with a short guide on how to implement custom backends.

[thomafred]

Side note - @jonhealy1 appears to have started work on a NoSQL backend. Pretty cool!

[jonhealy1]

@thomafred Hi. What kind of backend do you want to create? The most important piece is changing the database logic. I just copied the sqlalchemy folder, renamed it, and then changed the calls in core.py and transactions.py. That wasn't all there was to it - you have to set up your db in config.py for one thing - but I thought it was a good place to start. I was able to re-use most of the backend code in sqlalchemy even though I changed it to mongo. A guide would be great.

[thomafred]

@jonhealy1 - Thank you so much for you input, this will take me a long way.

I am contemplating a backend for an industrial datalake.

[jonhealy1]

Cool.

[geospatial-jeff]

I can start working on some documentation, the project needs it badly 😅