migration: establish exact preserved app baseline

app/backend/features/alerts/__init__.py

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+from .service import AlertService
+
+__all__ = ["AlertService"]

app/backend/features/alerts/service.py

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+from __future__ import annotations
+
+import secrets
+from datetime import date, datetime
+from typing import Any
+
+from app_config import validate_text
+from backend.database.repositories import AlertRepository
+
+
+class AlertService:
+    def __init__(self, repository: AlertRepository) -> None:
+        self.repository = repository
+
+    def create_manual(self, user_id: int, payload: dict[str, Any]) -> int:
+        title = validate_text(payload.get("title"), "提醒标题", 80, required=True)
+        content = validate_text(payload.get("content"), "提醒内容", 500)
+        code = validate_text(payload.get("code"), "股票代码", 12)
+        available_date = self.calendar_date(
+            str(payload.get("remind_date") or date.today().isoformat())
+        )
+        return self.repository.save_alert(
+            user_id=user_id,
+            kind="manual",
+            title=title,
+            content=content,
+            available_date=available_date,
+            code=code,
+            dedupe_key=f"manual:{secrets.token_hex(12)}",
+        )
+
+    def sync_strategy_tracking(self, user_id: int, tracking: dict[str, Any]) -> int:
+        synced = 0
+        today = date.today().strftime("%Y%m%d")
+        for batch in tracking.get("batches") or []:
+            items = batch.get("items") or []
+            summary = batch.get("summary") or {}
+            if not items:
+                continue
+            run_id = int(batch.get("run_id") or 0)
+            strategy_name = str(batch.get("strategy_name") or "选股策略")
+            observed = int(summary.get("observed") or 0)
+            completed = int(summary.get("completed") or 0)
+            if observed:
+                win_rate = summary.get("t1_win_rate")
+                suffix = f"，当前红盘率 {win_rate:.1f}%" if win_rate is not None else ""
+                self.repository.save_alert(
+                    user_id, "strategy_t1", f"{strategy_name} 已有 T+1 反馈",
+                    f"{observed}/{len(items)} 只标的已有首日表现{suffix}。",
+                    today, "", f"strategy:{run_id}:t1",
+                )
+                synced += 1
+            if completed == len(items):
+                average = summary.get("average_t5")
+                suffix = f"，平均收益 {average:+.2f}%" if average is not None else ""
+                self.repository.save_alert(
+                    user_id, "strategy_t5", f"{strategy_name} 五日跟踪完成",
+                    f"本批 {len(items)} 只标的已完成 T+5 跟踪{suffix}。",
+                    today, "", f"strategy:{run_id}:t5",
+                )
+                synced += 1
+        return synced
+
+    def list_alerts(
+        self, user_id: int, status: str = "all", as_of: str = ""
+    ) -> dict[str, Any]:
+        if status not in {"all", "unread"}:
+            raise ValueError("提醒筛选不支持。")
+        compact_date = self.calendar_date(as_of or date.today().isoformat())
+        items = self.repository.list_alerts(user_id, compact_date, status == "unread")
+        for item in items:
+            item["due"] = str(item.get("available_date") or "") <= compact_date
+        return {
+            "items": items,
+            "unread_count": self.repository.count_unread_alerts(user_id, compact_date),
+            "as_of": compact_date,
+        }
+
+    def mark_read(self, user_id: int, alert_id: int) -> bool:
+        return self.repository.mark_alert_read(user_id, alert_id)
+
+    def mark_all_read(self, user_id: int, as_of: str) -> int:
+        return self.repository.mark_all_alerts_read(user_id, as_of)
+
+    def delete(self, user_id: int, alert_id: int) -> bool:
+        return self.repository.delete_alert(user_id, alert_id)
+
+    @staticmethod
+    def calendar_date(value: str) -> str:
+        compact = value.replace("-", "").strip()
+        try:
+            parsed = datetime.strptime(compact, "%Y%m%d")
+        except ValueError as exc:
+            raise ValueError("提醒日期格式应为 YYYY-MM-DD。") from exc
+        return parsed.strftime("%Y%m%d")