feat(stock): 매매알람 쿨다운 중복억제 + 종목명 해석

- 쿨다운(TRADE_ALERT_COOLDOWN_HOURS 기본 6h): 같은 종목·조건 해제→재발화 오실레이션 시
  재알림 억제(set_alert_firing mark_fired=False로 firing 유지·발동시각 미갱신, suppressed 카운트).
- 종목명: 워커 firing에 name 없어도 NAS가 watchlist→portfolio→krx_master로 해석해 알림·이력에 포함.

stock/app/db.py

@@ -465,10 +465,17 @@ def get_alert_state_firing() -> set:
     return {(r["ticker"], r["kind"], r["condition"]) for r in rows}
 
 
-def set_alert_firing(ticker: str, kind: str, condition: str, firing: bool, at_iso: str = None) -> None:
+def set_alert_firing(ticker: str, kind: str, condition: str, firing: bool,
+                     at_iso: str = None, mark_fired: bool = True) -> None:
+    """currently_firing 상태 갱신.
+
+    mark_fired=True(기본): 실제 알림 발송 → first/last_fired_at 갱신.
+    mark_fired=False: 쿨다운으로 발송 억제하되 firing 상태만 유지 → 발동시각 미갱신
+      (쿨다운이 계속 연장되지 않도록).
+    """
     now = at_iso or _now_iso()
     with _conn() as conn:
-        if firing:
+        if firing and mark_fired:
             conn.execute(
                 """INSERT INTO trade_alert_state(ticker,kind,condition,currently_firing,first_fired_at,last_fired_at,last_seen_at)
                    VALUES(?,?,?,1,?,?,?)
@@ -479,6 +486,14 @@ def set_alert_firing(ticker: str, kind: str, condition: str, firing: bool, at_is
                      last_seen_at=excluded.last_seen_at""",
                 (ticker, kind, condition, now, now, now),
             )
+        elif firing and not mark_fired:
+            conn.execute(
+                """INSERT INTO trade_alert_state(ticker,kind,condition,currently_firing,last_seen_at)
+                   VALUES(?,?,?,1,?)
+                   ON CONFLICT(ticker,kind,condition) DO UPDATE SET
+                     currently_firing=1, last_seen_at=excluded.last_seen_at""",
+                (ticker, kind, condition, now),
+            )
         else:
             conn.execute(
                 "UPDATE trade_alert_state SET currently_firing=0, last_seen_at=? WHERE ticker=? AND kind=? AND condition=?",
@@ -486,6 +501,32 @@ def set_alert_firing(ticker: str, kind: str, condition: str, firing: bool, at_is
             )
 
 
+def get_alert_last_fired_map() -> dict:
+    """{(ticker,kind,condition): last_fired_at ISO} — 쿨다운 판정용."""
+    with _conn() as conn:
+        rows = conn.execute(
+            "SELECT ticker,kind,condition,last_fired_at FROM trade_alert_state"
+        ).fetchall()
+    return {(r["ticker"], r["kind"], r["condition"]): r["last_fired_at"] for r in rows}
+
+
+def get_ticker_name(ticker: str) -> Optional[str]:
+    """종목명 해석 — watchlist → portfolio → krx_master 순. 없으면 None."""
+    with _conn() as conn:
+        for sql in (
+            "SELECT name FROM watchlist WHERE ticker=?",
+            "SELECT name FROM portfolio WHERE ticker=? LIMIT 1",
+            "SELECT name FROM krx_master WHERE ticker=?",
+        ):
+            try:
+                row = conn.execute(sql, (ticker,)).fetchone()
+            except sqlite3.OperationalError:
+                continue  # 일부 테스트 DB엔 해당 테이블 부재
+            if row and row["name"]:
+                return row["name"]
+    return None
+
+
 def touch_alert_seen(keys: list, at_iso: str) -> None:
     with _conn() as conn:
         for (ticker, kind, condition) in keys: