refactor(web-ai): rename signal_v2→ai_trade, deprecate signal_v1

박재오 결정 2026-05-19 — V2를 정식 명칭 ai_trade로 graduation,
V1은 deprecated 마킹 (legacy 디렉토리 이동은 file lock 풀린 후 후속).

변경 사항:
- signal_v2/ → ai_trade/ (git mv, import 일괄 sed: signal_v2.x → ai_trade.x)
- root start.bat → legacy/start_v1.bat (V1 자동 시작 차단)
- ai_trade/start.bat 내부 uvicorn target signal_v2.main → ai_trade.main
- signal_v1/DEPRECATED.md 추가 (사용 금지 명시)
- CLAUDE.md 디렉토리 표·서버 시작 방식 갱신
- services/ 디렉토리 미래 예정 (Plan-B-Insta 작업 시 신설)

ai_trade tests 59/59 PASS 확인.

signal_v1/ 디렉토리 자체 이동(legacy/signal_v1/)은 telegram_bot.log +
data/news_snapshots.db file lock으로 보류. lock 해제 후 후속 커밋.

후속 작업: Plan-B-Insta (services/insta-render + NAS insta 분할)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ai_trade/rate_limit.py

@@ -0,0 +1,73 @@
+"""SignalDedup — SQLite-backed 24h duplicate signal blocker."""
+from __future__ import annotations
+import sqlite3
+from contextlib import contextmanager
+from datetime import datetime, timedelta
+from pathlib import Path
+from zoneinfo import ZoneInfo
+
+KST = ZoneInfo("Asia/Seoul")
+
+
+def _now_iso() -> str:
+    """Test seam — overridable via monkeypatch."""
+    return datetime.now(KST).isoformat()
+
+
+_SCHEMA = """
+CREATE TABLE IF NOT EXISTS signal_dedup (
+    ticker      TEXT NOT NULL,
+    action      TEXT NOT NULL,
+    last_sent   TEXT NOT NULL,
+    confidence  REAL NOT NULL,
+    PRIMARY KEY (ticker, action)
+);
+CREATE INDEX IF NOT EXISTS idx_signal_dedup_last_sent
+    ON signal_dedup(last_sent);
+"""
+
+
+class SignalDedup:
+    """24h dedup interface. WAL + busy_timeout=120000."""
+
+    def __init__(self, db_path: Path):
+        self._db_path = Path(db_path)
+        self._db_path.parent.mkdir(parents=True, exist_ok=True)
+        self._init_schema()
+
+    @contextmanager
+    def _conn(self):
+        conn = sqlite3.connect(self._db_path, timeout=120.0)
+        try:
+            conn.execute("PRAGMA journal_mode=WAL")
+            conn.execute("PRAGMA busy_timeout=120000")
+            yield conn
+        finally:
+            conn.close()
+
+    def _init_schema(self) -> None:
+        with self._conn() as conn:
+            conn.executescript(_SCHEMA)
+            conn.commit()
+
+    def is_recent(self, ticker: str, action: str, within_hours: int = 24) -> bool:
+        threshold_dt = datetime.fromisoformat(_now_iso()) - timedelta(hours=within_hours)
+        threshold_iso = threshold_dt.isoformat()
+        with self._conn() as conn:
+            row = conn.execute(
+                "SELECT last_sent FROM signal_dedup WHERE ticker = ? AND action = ?",
+                (ticker, action),
+            ).fetchone()
+        return row is not None and row[0] >= threshold_iso
+
+    def record(self, ticker: str, action: str, confidence: float) -> None:
+        with self._conn() as conn:
+            conn.execute(
+                """INSERT INTO signal_dedup (ticker, action, last_sent, confidence)
+                   VALUES (?, ?, ?, ?)
+                   ON CONFLICT (ticker, action) DO UPDATE
+                   SET last_sent = excluded.last_sent,
+                       confidence = excluded.confidence""",
+                (ticker, action, _now_iso(), confidence),
+            )
+            conn.commit()