feat(stock): 매매알람 DB — watchlist/alert_state/history 테이블+헬퍼

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EqCYBhvTcdeCTUDX3RhWx9

stock/tests/test_trade_alerts_db.py

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+import os, sqlite3, tempfile, datetime as dt
+import pytest
+
+@pytest.fixture
+def db(monkeypatch, tmp_path):
+    from app import db as _db
+    monkeypatch.setattr(_db, "DB_PATH", str(tmp_path / "stock.db"))
+    _db.init_db()
+    return _db
+
+def test_watchlist_add_get_remove(db):
+    db.add_watchlist("005930", "삼성전자", note="관심")
+    db.add_watchlist("005930", "삼성전자")  # 멱등
+    wl = db.get_watchlist()
+    assert [w["ticker"] for w in wl] == ["005930"]
+    assert wl[0]["name"] == "삼성전자"
+    assert db.remove_watchlist("005930") is True
+    assert db.get_watchlist() == []
+
+def test_alert_state_edge_firing_and_clear(db):
+    key = ("005930", "buy", "buy_breakout")
+    assert db.get_alert_state_firing() == set()
+    db.set_alert_firing(*key, firing=True, at_iso="2026-07-02T00:01:00Z")
+    assert key in db.get_alert_state_firing()
+    db.set_alert_firing(*key, firing=False)
+    assert key not in db.get_alert_state_firing()
+
+def test_alert_history_records_and_reads(db):
+    db.add_alert_history("005930", "삼성전자", "buy", "buy_breakout", 71500, {"vol": 2.1})
+    rows = db.get_alert_history(days=7)
+    assert len(rows) == 1
+    assert rows[0]["ticker"] == "005930" and rows[0]["kind"] == "buy"
+    assert rows[0]["detail"]["vol"] == 2.1