fix: watchlist回注unknown时用旧candidates.sector fallback——不再产生unknown来源候选

deploy/profile-scripts/watchlist_auto_exit.py

@@ -86,6 +86,14 @@ def main(dry_run=False):
                     "SELECT strategy_name FROM holding_strategies WHERE code=? AND status='active'",
                     (code,)).fetchone()
                 _strat_name = (_strat[0] if _strat and _strat[0] else "unknown")
+                # 2026-08-18 修复：holding.strategy_name 为 unknown 时，回退用 candidates 里旧的 sector
+                # （候选的 sector 是正确策略标签，但 holding 早期 promote 时 source_strategy 可能没继承）
+                if _strat_name == "unknown" or not _strat_name:
+                    _old_sec = conn.execute(
+                        "SELECT sector FROM candidates WHERE code=?", (code,)).fetchone()
+                    _old_sec_v = str(_old_sec[0]).strip() if _old_sec and _old_sec[0] else ""
+                    if _old_sec_v and _old_sec_v != "unknown":
+                        _strat_name = _old_sec_v
                 conn.execute(
                     "INSERT INTO candidates (code, name, sector, reason, dropped, drop_reason, promoted, "
                     "source_strategy, created_at) "