Summary

Table Browser _ensureSchema swallows getTableSchema errors and sets primaryKeys = [] + schemaLoaded = true. The status line then says Cannot edit: no primary key detected even when the PK query failed (permissions, disconnect).

Scope

• Distinguish “no PK” vs “schema unavailable”.
• Keep editing disabled; show the real error (or a Retry).
• Cover in table_view_staging / table-view tests with a throwing schema stub.

Out of scope

• SQLite implicit rowid as a PK fallback (separate issue).