refactor: enforce account scoped repository boundaries

backend/database/repositories/ports.py

@@ -0,0 +1,52 @@
+from __future__ import annotations
+
+from typing import Any, Protocol
+
+
+class AlertRepository(Protocol):
+    def save_alert(
+        self, user_id: int, kind: str, title: str, content: str,
+        available_date: str, code: str, dedupe_key: str,
+    ) -> int: ...
+
+    def list_alerts(
+        self, user_id: int, as_of: str, unread_only: bool = False, limit: int = 100,
+    ) -> list[dict[str, Any]]: ...
+
+    def count_unread_alerts(self, user_id: int, as_of: str) -> int: ...
+
+    def mark_alert_read(self, user_id: int, alert_id: int) -> bool: ...
+
+    def mark_all_alerts_read(self, user_id: int, as_of: str) -> int: ...
+
+    def delete_alert(self, user_id: int, alert_id: int) -> bool: ...
+
+
+class TradeJournalRepository(Protocol):
+    def save_trade_entry(self, *args: Any, **kwargs: Any) -> int: ...
+
+    def list_trade_entries(
+        self, user_id: int, start_date: str = "", end_date: str = "",
+        code: str = "", limit: int = 300,
+    ) -> list[dict[str, Any]]: ...
+
+    def delete_trade_entry(self, user_id: int, trade_id: int) -> bool: ...
+
+
+class StrategyTrackingRepository(Protocol):
+    def save_strategy_tracks(
+        self, user_id: int, run_id: int, selection_date: str,
+        strategy_name: str, candidates: list[dict[str, Any]],
+    ) -> int: ...
+
+    def get_screener_run(self, user_id: int, run_id: int) -> dict[str, Any] | None: ...
+
+    def delete_strategy_track(self, user_id: int, track_id: int) -> bool: ...
+
+    def list_strategy_tracks(
+        self, user_id: int, limit_batches: int = 12,
+    ) -> list[dict[str, Any]]: ...
+
+    def load_tracking_bars(
+        self, targets: list[tuple[str, str]], limit: int = 5,
+    ) -> dict[tuple[str, str], list[dict[str, Any]]]: ...