activity_ring_tables

Katz 0.040

Rust diagnostics schema v2 also keeps activity rings:
- `document_updates` — Ideas Summary timeline “ index ” events ( `file_uri`, `idea_count`, `ideas`, `at` )
- `workspace_changes` — watcher create / change / delete activity ( `file_uri`, `change`, `at` )
Cap: 50 rows each ( diagnostics.rs `MAX_ACTIVITY` ).
diagnostics_sqlite

Interactive page: activity_ring_tables