download bas: embed timeseries into the JSON so the file is self-contained

bincio/serve/routers/download.py

@@ -114,10 +114,27 @@ async def download_activity(
     _check_download_permission(detail, handle, bincio_session)
 
     if fmt == "bas":
-        return FileResponse(
+        # Embed the timeseries so the downloaded file is self-contained.
-            detail_path,
+        ts_path: Path | None = None
+        data_dir = deps._get_data_dir()
+        for base in (
+            data_dir / handle / "_merged" / "activities",
+            data_dir / handle / "activities",
+        ):
+            p = base / f"{activity_id}.timeseries.json"
+            if p.exists():
+                ts_path = p
+                break
+        if ts_path:
+            try:
+                detail["timeseries"] = json.loads(ts_path.read_text(encoding="utf-8"))
+                detail.pop("timeseries_url", None)
+            except (OSError, json.JSONDecodeError):
+                pass
+        content = json.dumps(detail, ensure_ascii=False, indent=2)
+        return Response(
+            content=content,
             media_type="application/json",
-            filename=f"{activity_id}.json",
             headers={"Content-Disposition": f'attachment; filename="{activity_id}.json"'},
         )