diff --git a/prd.json b/prd.json
index 5c0649f..b9122fb 100644
--- a/prd.json
+++ b/prd.json
@@ -603,7 +603,7 @@
         "Verify in browser using dev-browser skill"
       ],
       "priority": 34,
-      "passes": false,
+      "passes": true,
       "notes": ""
     },
     {
diff --git a/progress.txt b/progress.txt
index 6bb111b..d900036 100644
--- a/progress.txt
+++ b/progress.txt
@@ -491,3 +491,18 @@
   - clearDraft is exported for use in save functionality (US-034) to clear draft after successful database save
   - JSON.stringify comparison works for flowchart data equality check
 ---
+
+## 2026-01-22 - US-034
+- What was implemented: Save project to database functionality
+- Files changed:
+  - src/app/editor/[projectId]/FlowchartEditor.tsx - implemented handleSave with Supabase update, added isSaving state and Toast notifications
+  - src/components/editor/Toolbar.tsx - added isSaving prop with loading spinner indicator
+- **Learnings for future iterations:**
+  - Use createClient() from lib/supabase/client.ts for browser-side database operations
+  - Supabase update returns { error } object for error handling
+  - Use async/await with try/catch for async save operations
+  - Set updated_at manually with new Date().toISOString() for Supabase JSONB updates
+  - Clear LocalStorage draft after successful save to avoid stale drafts
+  - Toast state uses object with message and type for flexibility
+  - Loading spinner SVG with animate-spin class for visual feedback during save
+---