SQLite tooling

We don't currently employ any sqlite lints, formatters or other tooling.

We should consider at least the following:

- `sqlite3 .lint`
- `sqlite3 .expert`
- [`sqruff`](https://playground.quary.dev/docs/)

This will be especially useful once we have migrated off of diesel, and can use dedicated `.sql` files for the statements as well.

Look at the current database setup in the codebase, especially any SQLite usage. Research sqlite3 .lint, .expert, and sqruff to understand their integration. Check if there are existing .sql files or plans to migrate from diesel. Determine where to add these tools in the build or development workflow.

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