The insert-database modal called the public bridge /api/v1/tables route,
which requires a databaseId and a Baserow user JWT — the modal supplied
neither, so the request returned 400 then 501.
Add a step 0 to pick a workspace and database (auto-resolved when each
lists only one), then list tables via the admin endpoint
GET /api/v1/admin/tables?databaseId=X. The client extension is also
rewired to .extend() the shared DatabaseView node.