feat: add account-scoped in-app reminder center

database.py

@@ -277,6 +277,26 @@ class ReviewDatabase:
 
                 CREATE INDEX IF NOT EXISTS idx_strategy_tracks_user_run
                 ON strategy_tracks(user_id, run_id DESC, id);
+
+                CREATE TABLE IF NOT EXISTS alerts (
+                    id INTEGER PRIMARY KEY AUTOINCREMENT,
+                    user_id INTEGER NOT NULL,
+                    kind TEXT NOT NULL,
+                    title TEXT NOT NULL,
+                    content TEXT NOT NULL DEFAULT '',
+                    available_date TEXT NOT NULL,
+                    code TEXT NOT NULL DEFAULT '',
+                    dedupe_key TEXT NOT NULL,
+                    is_read INTEGER NOT NULL DEFAULT 0,
+                    created_at TEXT NOT NULL,
+                    updated_at TEXT NOT NULL,
+                    read_at TEXT,
+                    UNIQUE(user_id, dedupe_key),
+                    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+                );
+
+                CREATE INDEX IF NOT EXISTS idx_alerts_user_due
+                ON alerts(user_id, available_date, is_read, id DESC);
                 """
             )
             user_columns = {
@@ -1426,6 +1446,110 @@ class ReviewDatabase:
             for ts_code, selection_date in unique_targets
         }
 
+    def save_alert(
+        self,
+        user_id: int,
+        kind: str,
+        title: str,
+        content: str,
+        available_date: str,
+        code: str,
+        dedupe_key: str,
+    ) -> int:
+        now = datetime.now().astimezone().isoformat(timespec="seconds")
+        with self.connect() as connection:
+            connection.execute(
+                """
+                INSERT INTO alerts
+                    (user_id, kind, title, content, available_date, code, dedupe_key,
+                     is_read, created_at, updated_at)
+                VALUES (?, ?, ?, ?, ?, ?, ?, 0, ?, ?)
+                ON CONFLICT(user_id, dedupe_key) DO UPDATE SET
+                    title=excluded.title, content=excluded.content,
+                    available_date=excluded.available_date, updated_at=excluded.updated_at
+                """,
+                (
+                    int(user_id), kind, title, content, available_date, code,
+                    dedupe_key, now, now,
+                ),
+            )
+            row = connection.execute(
+                "SELECT id FROM alerts WHERE user_id = ? AND dedupe_key = ?",
+                (int(user_id), dedupe_key),
+            ).fetchone()
+        return int(row["id"])
+
+    def list_alerts(
+        self, user_id: int, as_of: str, unread_only: bool = False, limit: int = 100
+    ) -> list[dict[str, Any]]:
+        with self.connect() as connection:
+            if unread_only:
+                rows = connection.execute(
+                    """
+                    SELECT id, kind, title, content, available_date, code, is_read,
+                           created_at, updated_at, read_at
+                    FROM alerts
+                    WHERE user_id = ? AND available_date <= ? AND is_read = 0
+                    ORDER BY available_date DESC, id DESC LIMIT ?
+                    """,
+                    (int(user_id), as_of, max(1, min(300, int(limit)))),
+                ).fetchall()
+            else:
+                rows = connection.execute(
+                    """
+                    SELECT id, kind, title, content, available_date, code, is_read,
+                           created_at, updated_at, read_at
+                    FROM alerts WHERE user_id = ?
+                    ORDER BY CASE WHEN available_date > ? THEN 0 ELSE 1 END,
+                             is_read, available_date, id DESC LIMIT ?
+                    """,
+                    (int(user_id), as_of, max(1, min(300, int(limit)))),
+                ).fetchall()
+        return [{**dict(row), "is_read": bool(row["is_read"])} for row in rows]
+
+    def count_unread_alerts(self, user_id: int, as_of: str) -> int:
+        with self.connect() as connection:
+            row = connection.execute(
+                """
+                SELECT COUNT(*) AS total FROM alerts
+                WHERE user_id = ? AND available_date <= ? AND is_read = 0
+                """,
+                (int(user_id), as_of),
+            ).fetchone()
+        return int(row["total"] if row else 0)
+
+    def mark_alert_read(self, user_id: int, alert_id: int) -> bool:
+        now = datetime.now().astimezone().isoformat(timespec="seconds")
+        with self.connect() as connection:
+            cursor = connection.execute(
+                """
+                UPDATE alerts SET is_read = 1, read_at = ?, updated_at = ?
+                WHERE id = ? AND user_id = ?
+                """,
+                (now, now, int(alert_id), int(user_id)),
+            )
+            return cursor.rowcount > 0
+
+    def mark_all_alerts_read(self, user_id: int, as_of: str) -> int:
+        now = datetime.now().astimezone().isoformat(timespec="seconds")
+        with self.connect() as connection:
+            cursor = connection.execute(
+                """
+                UPDATE alerts SET is_read = 1, read_at = ?, updated_at = ?
+                WHERE user_id = ? AND available_date <= ? AND is_read = 0
+                """,
+                (now, now, int(user_id), as_of),
+            )
+            return int(cursor.rowcount)
+
+    def delete_alert(self, user_id: int, alert_id: int) -> bool:
+        with self.connect() as connection:
+            cursor = connection.execute(
+                "DELETE FROM alerts WHERE id = ? AND user_id = ?",
+                (int(alert_id), int(user_id)),
+            )
+            return cursor.rowcount > 0
+
     def start_sync(self, trade_date: str, source: str) -> int:
         started_at = datetime.now().astimezone().isoformat(timespec="seconds")
         with self.connect() as connection: