Root cause: layers.id is TEXT PRIMARY KEY (global unique across all drawings).
Hardcoded IDs layer-0..layer-4 collided when multiple projects tried to create
the same layer IDs. Second project got UNIQUE constraint failed on POST /layers.
Without layers, elements had dangling layer_id refs causing FOREIGN KEY errors.
Fix: makeInitialLayers() generates unique IDs: layer-{timestamp}-{index}.
activeLayerId initialized from first layer, not hardcoded.
activeLayerName uses activeLayerId variable, not hardcoded layer-0.
On project load with existing layers, activeLayerId set from first DB layer.
Three fixes:
1. interaction/index.ts: Add layerId to created element in confirmDraw()
2. CanvasArea.tsx: Sync layers to LayerManager via layerManagerRef
3. App.tsx: Fallback to activeLayerId in handleElementCreated if layerId missing
Root cause: LayerManager.activeLayerId was empty because layers were never
synced from React state to the interaction layer LayerManager. New elements
got layer_id="" which failed SQLite FOREIGN KEY constraint.
Also includes Yjs sync race condition fix from previous commit.
- CanvasArea: add useEffect to refresh InteractionEngine callbacks when props change
- App.tsx: handleElementCreated/Deleted/Modified now use functional setElements updates
- Root cause: CanvasArea init useEffect had empty deps, capturing stale callbacks at mount
- handleElementCreated used [...elements, el] with stale elements=[] closure
- Each new element replaced all previous ones instead of appending
- All 343 tests pass, tsc clean
Leopoldadmin