fix(server): test R2 SQL connections with catalog metadata

[lentil32]

One-Line Summary

Cloudflare R2 SQL data sources can be tested without sending an invalid table-less SELECT query.

User-Facing Changes

• Creating or testing a Cloudflare R2 SQL data source no longer fails because the connection test sends the old SELECT smoke query.
• The connection test now uses a catalog metadata command that Cloudflare R2 SQL accepts.

Why This Changed

Cloudflare R2 SQL rejects queries that do not reference a table, so the generic SELECT-based smoke test failed before Velen could save a valid data source. Catalog metadata commands are the correct lightweight path for checking credentials and warehouse reachability.

How It Changed

• Replaced the Cloudflare R2 SQL connection test query with SHOW DATABASES.
• Added a server test that verifies R2 SQL connection testing sends SHOW DATABASES with the expected warehouse name.

Bug Fixes

• Under Cloudflare R2 SQL data source creation, valid credentials could still fail the connection test because the previous smoke query did not reference a table.

Verification

• rtk bunx turbo test --filter=@onequery/server --json
• rtk bunx turbo typecheck --filter=@onequery/server --json
• rtk bunx turbo run //#check:fix --json
• pre-push hook: type-aware lint passed

Video / Screenshot (Optional)

• N/A

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	onequery-landing	2777757	Commit Preview URL Branch Preview URL	Jun 25 2026, 08:45 AM