Abhimanyu Yadav 290d0d9a9b feat(frontend): add auto-save Draft Recovery feature with IndexedDB persistence
(#11658)

## Summary
Implements an auto-save draft recovery system that persists unsaved flow
builder state across browser sessions, tab closures, and refreshes. When
users return to a flow with unsaved changes, they can choose to restore
or discard the draft via an intuitive recovery popup.



https://github.com/user-attachments/assets/0f77173b-7834-48d2-b7aa-73c6cd2eaff6



## Changes 🏗️

### Core Features
- **Draft Recovery Popup** (`DraftRecoveryPopup.tsx`)
  - Displays amber-themed notification with unsaved changes metadata
  - Shows node count, edge count, and relative time since last save
  - Provides restore and discard actions with tooltips
  - Auto-dismisses on click outside or ESC key

- **Auto-Save System** (`useDraftManager.ts`)
  - Automatically saves draft state every 15 seconds
  - Saves on browser tab close/refresh via `beforeunload`
  - Tracks nodes, edges, graph schemas, node counter, and flow version
  - Smart dirty checking - only saves when actual changes detected
  - Cleans up expired drafts (24-hour TTL)

- **IndexedDB Persistence** (`db.ts`, `draft-service.ts`)
  - Uses Dexie library for reliable client-side storage
- Handles both existing flows (by flowID) and new flows (via temp
session IDs)
- Compares draft state with current state to determine if recovery
needed
  - Automatically clears drafts after successful save

### Integration Changes
- **Flow Editor** (`Flow.tsx`)
  - Integrated `DraftRecoveryPopup` component
  - Passes `isInitialLoadComplete` state for proper timing

- **useFlow Hook** (`useFlow.ts`)
  - Added `isInitialLoadComplete` state to track when flow is ready
  - Ensures draft check happens after initial graph load
  - Resets state on flow/version changes

- **useCopyPaste Hook** (`useCopyPaste.ts`)
  - Refactored to manage keyboard event listeners internally
  - Simplified integration by removing external event handler setup

- **useSaveGraph Hook** (`useSaveGraph.ts`)
  - Clears draft after successful save (both create and update)
  - Removes temp flow ID from session storage on first save

### Dependencies
- Added `dexie@4.2.1` - Modern IndexedDB wrapper for reliable
client-side storage

## Technical Details

**Auto-Save Flow:**
1. User makes changes to nodes/edges
2. Change triggers 15-second debounced save
3. Draft saved to IndexedDB with timestamp
4. On save, current state compared with last saved state
5. Only saves if meaningful changes detected

**Recovery Flow:**
1. User loads flow/refreshes page
2. After initial load completes, check for existing draft
3. Compare draft with current state
4. If different and non-empty, show recovery popup
5. User chooses to restore or discard
6. Draft cleared after either action

**Session Management:**
- Existing flows: Use actual flowID for draft key

### Test Plan 🧪

- [x] Create a new flow with 3+ blocks and connections, wait 15+
seconds, then refresh the page - verify recovery popup appears with
correct counts and restoring works
- [x] Create a flow with blocks, refresh, then click "Discard" button on
recovery popup - verify popup disappears and draft is deleted
- [x] Add blocks to a flow, save successfully - verify draft is cleared
from IndexedDB (check DevTools > Application > IndexedDB)
- [x] Make changes to an existing flow, refresh page - verify recovery
popup shows and restoring preserves all changes correctly
- [x] Verify empty flows (0 nodes) don't trigger recovery popup or save
drafts
2025-12-31 14:49:53 +00:00
2025-01-29 10:31:57 -06:00
2025-03-24 18:11:56 +00:00
2025-07-25 15:39:29 +01:00

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