Fix hub full-close double-booking trend plans.

Sync active plans after hub position close, merge final close snapshots per plan, and backfill missing trade records when ending an already-stopped plan.

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/hub.py

@@ -1586,6 +1586,17 @@ async def api_close_position(exchange_id: str, body: ClosePositionBody):
             "payload": payload,
             "ok": bool(isinstance(payload, dict) and payload.get("ok")),
         }
+        if out.get("ok") and "trend" in (ex.get("capabilities") or []):
+            async with httpx.AsyncClient() as flask_client:
+                sync_parsed = await _fetch_flask_json(
+                    flask_client,
+                    ex,
+                    "/api/hub/trend/sync-flat",
+                    method="POST",
+                    json_body={"symbol": sym, "side": side},
+                )
+            if isinstance(sync_parsed, dict):
+                out["trend_sync"] = sync_parsed
         _schedule_board_refresh()
         return out