fix: timeline cache bust + no-cache headers + debug logging

backend/main.py

@@ -138,14 +138,22 @@ async def analyze_video(file: UploadFile = File(...)):
 frontend_path = Path(__file__).parent.parent / "frontend-vanilla"
 
 if frontend_path.exists():
-    @app.get("/")
-    async def serve_index():
-        return FileResponse(str(frontend_path / "index.html"))
-
     @app.get("/script.js")
     async def serve_script():
-        return FileResponse(str(frontend_path / "script.js"),
-                            media_type="application/javascript")
+        from fastapi.responses import FileResponse
+        return FileResponse(
+            str(frontend_path / "script.js"),
+            media_type="application/javascript",
+            headers={"Cache-Control": "no-store, no-cache, must-revalidate"},
+        )
+
+    @app.get("/")
+    async def serve_index():
+        from fastapi.responses import FileResponse
+        return FileResponse(
+            str(frontend_path / "index.html"),
+            headers={"Cache-Control": "no-store, no-cache, must-revalidate"},
+        )
 
 
 if __name__ == "__main__":

frontend/index.html

@@ -408,6 +408,6 @@ header{position:sticky;top:0;z-index:50;background:rgba(5,5,8,0.85);backdrop-fil
   draw();
 })();
 </script>
-<script src="script.js"></script>
+<script src="script.js?v=3"></script>
 </body>
 </html>

frontend/script.js

@@ -102,6 +102,7 @@ async function analyzeVideo() {
       throw new Error(e.detail || `Server error ${res.status}`);
     }
     const data = await res.json();
+    console.log('[API Response] keys:', Object.keys(data), '| frame_timeline length:', data.frame_timeline?.length);
     renderResult(data);
   } catch (err) {
     showError(err.message || 'Connection to analysis engine failed.');
@@ -271,6 +272,7 @@ function renderTimeline(data, isFake) {
 
   // Backend sends frame_timeline: [{frame, fake_pct}, ...]
   const frames = data.frame_timeline || data.frame_scores || [];
+  console.log('[Timeline] frame_timeline:', data.frame_timeline?.length, 'frames:', frames.length, 'sample:', frames[0]);
   if (!frames.length) {
     chart.innerHTML = '<span style="font-size:11px;color:var(--muted);font-family:\'JetBrains Mono\',monospace;margin:auto;">No per-frame data available</span>';
     return;