wealthfolio: add compute_position_qty for broker reconciliation

broker_sync/sinks/wealthfolio.py

@@ -315,6 +315,50 @@ class WealthfolioSink:
                 total += amt
         return total
 
+    async def compute_position_qty(self, account_id: str) -> dict[str, Decimal]:
+        """Return per-symbol net position quantity (BUY/IN minus SELL/OUT) for
+        one account. Skips cash activities and unknown activity types.
+
+        Used by the IBKR reconciliation step to compare against broker-reported
+        OpenPositions.
+        """
+        qty_by_symbol: dict[str, Decimal] = {}
+        page = 1
+        while True:
+            resp = await self._request(
+                "POST", _ACTIVITIES_SEARCH,
+                json={"accountIds": [account_id], "page": page, "pageSize": 500},
+            )
+            resp.raise_for_status()
+            payload = resp.json()
+            activities = payload.get("activities", []) if isinstance(payload, dict) else []
+            if not activities:
+                break
+            for act in activities:
+                if not isinstance(act, dict):
+                    continue
+                symbol = act.get("symbol") or ""
+                if not symbol or symbol.startswith("$CASH"):
+                    continue
+                act_type = act.get("activityType") or ""
+                sign: int
+                if act_type in {"BUY", "ADD_HOLDING", "TRANSFER_IN"}:
+                    sign = 1
+                elif act_type in {"SELL", "REMOVE_HOLDING", "TRANSFER_OUT"}:
+                    sign = -1
+                else:
+                    continue
+                try:
+                    qty = Decimal(str(act.get("quantity") or 0))
+                except Exception:
+                    continue
+                qty_by_symbol[symbol] = qty_by_symbol.get(symbol, Decimal(0)) + sign * qty
+            total_pages = int(payload.get("totalPages") or 1) if isinstance(payload, dict) else 1
+            if page >= total_pages:
+                break
+            page += 1
+        return qty_by_symbol
+
     # -- manual holdings snapshots --
 
     async def push_manual_snapshots(