- "Last sync: never": The old blocking sync was killed by nginx at 120s before save_token was reached. The activities made it to disk (ingestion happens per-activity as it goes), but the token's

last_sync_at timestamp was never written. After deploying, do a soft reset — it'll set last_sync_at to your most recent activity's timestamp so the next sync only fetches newer ones.
  - Reset 404: Added POST /api/strava/reset to serve/server.py. The soft reset now looks in _merged/index.json first (multi-user path), falling back to index.json.

bincio/serve/server.py

@@ -663,16 +663,65 @@ async def strava_status(bincio_session: Optional[str] = Cookie(default=None)) ->
     if not strava_client_id:
         return JSONResponse({"configured": False, "connected": False, "last_sync": None})
     dd = _get_data_dir() / user.handle
-    token_path = dd / "strava_token.json"
-    connected = token_path.exists()
-    last_sync = None
-    if connected:
+    from bincio.extract.strava_api import load_token
+    token = load_token(dd)
+    return JSONResponse({
+        "configured": True,
+        "connected": token is not None,
+        "last_sync": token.get("last_sync_at") if token else None,
+    })
+
+
+@app.post("/api/strava/reset")
+async def strava_reset(request: Request, bincio_session: Optional[str] = Cookie(default=None)) -> JSONResponse:
+    """Reset last_sync_at so the next sync re-fetches from a chosen point.
+
+    mode=soft  — set to the started_at of the most recent activity on disk
+                 (next sync only fetches activities newer than the last known one)
+    mode=hard  — clear last_sync_at entirely
+                 (next sync re-downloads full Strava history, skipping existing files)
+    """
+    user = _require_user(bincio_session)
+    dd = _get_data_dir() / user.handle
+    from bincio.extract.strava_api import load_token, save_token
+    token = load_token(dd)
+    if token is None:
+        raise HTTPException(400, "Not connected to Strava")
+
+    body = await request.json()
+    mode = body.get("mode", "soft")
+
+    if mode == "hard":
+        token.pop("last_sync_at", None)
+        save_token(dd, token)
+        return JSONResponse({"ok": True, "mode": "hard", "last_sync_at": None})
+
+    # soft: find the most recent started_at across the user's merged index
+    from datetime import datetime, timezone
+    last_ts: int | None = None
+    for index_path in [dd / "_merged" / "index.json", dd / "index.json"]:
+        if not index_path.exists():
+            continue
         try:
-            token = json.loads(token_path.read_text())
-            last_sync = token.get("last_sync_at")
+            index_data = json.loads(index_path.read_text(encoding="utf-8"))
+            started_ats = [
+                a.get("started_at") for a in index_data.get("activities", [])
+                if a.get("started_at")
+            ]
+            if started_ats:
+                latest = max(started_ats)
+                dt = datetime.fromisoformat(latest.replace("Z", "+00:00"))
+                last_ts = int(dt.astimezone(timezone.utc).timestamp())
+                break
         except Exception:
-            pass
-    return JSONResponse({"configured": True, "connected": connected, "last_sync": last_sync})
+            continue
+
+    if last_ts is None:
+        token.pop("last_sync_at", None)
+    else:
+        token["last_sync_at"] = last_ts
+    save_token(dd, token)
+    return JSONResponse({"ok": True, "mode": "soft", "last_sync_at": last_ts})
 
 
 @app.get("/api/strava/auth-url")