The code looks really great [1], very declarative, looks like it should be pretty easy to add better PostgreSQL support. I also wonder if how easy it would be to plug it into VS Code, and build in an auto formatter (♥ω♥ ). At a glance it looks like it's parsing AST, which is really hard to find for SQL, so auto formatter could be possible to build from this. I notice SQLite could use some improving too, seems like a great project to coalesce around.

[1] https://github.com/sqlfluff/sqlfluff/blob/main/src/sqlfluff/...