GRAFO_D_V50_RUN

Base:
- SQLite remains the canonical single source of truth.
- No secondary persistent database.
- Graphs, events, folders, UI state, API registry, API traces and autosave audit are persisted in SQLite.

Functional state inherited from V49:
- Manual graph creation creates graph/container only, with zero fabricated events.
- Empty graphs are visible.
- Manual event creation from graph context menu writes to SQLite.
- Manual events appear in graph element list and timeline after render.
- Smart date parser supports year-only and common date formats.
- Physical delete removes graph, events, API traces, ingest logs and UI references.
- API live sensor remains backend-driven.
- Folder creation and UI folder state persist through SQLite.

V50 checkpoint:
- Autosave backend installed:
  - GET /api/autosave/status
  - POST /api/autosave/save
  - GET /api/persistence/status
- persistence_audit table tracks:
  - revision
  - dirty
  - last_operation
  - last_status
  - last_error
  - sqlite_integrity
  - graph_count
  - event_count
  - folder_count
  - api_count
  - updated_at
- Verified persisted folder state, including ESPACIO ABIERTO.
- Save button moved to the top-right area.
- Save button uses backend autosave verification.
- Sensor behavior under refinement:
  - green = SQLite verified, dirty=false
  - amber = saving/verifying
  - red = error or unverified
- Current issue noted:
  - visual sensor may still require single-script cleanup to prevent red/green alternation.

Validation:
- python compile check passed.
- SQLite PRAGMA integrity_check passed.
- render_excel_like.py executed successfully.