refactor(stock): Phase 1 리뷰 반영 (public get_krx_tickers·타입·limit명명·테스트)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

stock/app/db.py

@@ -117,7 +117,7 @@ def init_db():
               close       INTEGER,
               pnl_rate    REAL,
               reasons     TEXT,
-              created_at  TEXT NOT NULL DEFAULT (datetime('now')),
+              created_at  TEXT NOT NULL DEFAULT (datetime('now','localtime')),
               PRIMARY KEY (date, ticker)
             );
             """
@@ -321,10 +321,24 @@ def get_asset_snapshots(days: int = 30) -> List[Dict[str, Any]]:
         return [dict(r) for r in rows]
 
 
+# --- KRX Master ---
+
+def get_krx_tickers() -> set:
+    with _conn() as conn:
+        try:
+            rows = conn.execute("SELECT ticker FROM krx_master").fetchall()
+        except Exception:
+            return set()
+    return {r["ticker"] for r in rows}
+
+
 # --- Holdings Signals CRUD ---
 
-def upsert_holdings_signal(date, ticker, name, action, tech_score, exit_flags,
-                           issues, close, pnl_rate, reasons) -> None:
+def upsert_holdings_signal(
+    date: str, ticker: str, name: Optional[str], action: str,
+    tech_score: Optional[float], exit_flags: dict, issues: list,
+    close: Optional[int], pnl_rate: Optional[float], reasons: Optional[str],
+) -> None:
     with _conn() as conn:
         conn.execute(
             """
@@ -358,9 +372,10 @@ def get_latest_holdings_date() -> str | None:
         r = conn.execute("SELECT MAX(date) AS d FROM holdings_signals").fetchone()
     return r["d"] if r and r["d"] else None
 
-def get_holdings_signal_history(ticker: str, days: int = 30) -> list:
+def get_holdings_signal_history(ticker: str, limit: int = 30) -> list:
+    """최근 N개 시그널 행 (시그널은 거래일당 1행이라 ≈ N 거래일)."""
     with _conn() as conn:
         rows = conn.execute(
             "SELECT * FROM holdings_signals WHERE ticker=? ORDER BY date DESC LIMIT ?",
-            (ticker, days)).fetchall()
+            (ticker, limit)).fetchall()
     return [_row_to_signal(r) for r in rows]