I use dolthub's public database to practice queries.
I gave their bounty program a shot but I quit when I was prompted to download/clone a 8gb database. So the best thing would be to have a dolthub account and develop the data from there.
I think if you do a little bit of git hacking you can create a branch with just an empty or a dummy database based on the schema, clone only that branch and make a PR to append to the original database. But I couldn't figure that out.
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