sync: dashboard_routes.py from VPS — digest + contributor-graph endpoints

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

diagnostics/dashboard_routes.py

@@ -1310,6 +1310,7 @@ def register_dashboard_routes(app: web.Application, get_conn):
     app.router.add_get("/api/telegram-extractions", handle_telegram_extractions)
     app.router.add_get("/api/contributor-growth", handle_contributor_growth)
     app.router.add_get("/api/digest/latest", handle_digest_latest)
+    app.router.add_get("/api/contributor-graph", handle_contributor_graph)
 
 
 async def handle_digest_latest(request):
@@ -1324,3 +1325,25 @@ async def handle_digest_latest(request):
         return web.json_response({"error": "No digest available yet"}, status=404)
     except Exception as e:
         return web.json_response({"error": str(e)}, status=500)
+
+
+async def handle_contributor_graph(request):
+    """GET /api/contributor-graph — serve the PNG chart."""
+    import subprocess, os
+    png_path = "/opt/teleo-eval/static/contributor-graph.png"
+    # Regenerate if older than 1 hour or missing
+    regen = not os.path.exists(png_path)
+    if not regen:
+        age = __import__('time').time() - os.path.getmtime(png_path)
+        regen = age > 3600
+    if regen:
+        try:
+            subprocess.run(
+                ['python3', '/opt/teleo-eval/scripts/contributor-graph.py'],
+                timeout=30, capture_output=True
+            )
+        except Exception:
+            pass
+    if not os.path.exists(png_path):
+        return web.Response(text='Chart not available', status=503)
+    return web.FileResponse(png_path, headers={'Content-Type': 'image/png'})