Provide seed data for individual testing/development

[pascalwengerter]

Is your feature request related to a problem? Please describe.

While working on #409 I had to create and configure my Supabase database manually. Knowing there is a possibility to dump (and upload?) existing databases, I'd love to have a quickstart feature where one can seed a fresh database. Saying that, I'm aware that the OAuth setup can't be automated so there'll always be some degree of manual work.

Describe the solution you'd like

A data dump within the repo and 1-2 simple commands or instructions on how to use it

Describe alternatives you've considered

Doing it manually isn't the biggest pain ever, but it would shave a couple of minutes off of potential contributor's necessary time commitment