fix(promote_candidates): 补_exec_retry定义(DB锁自动重试)

deploy/profile-scripts/promote_candidates.py

@@ -14,6 +14,22 @@ try:
 except Exception:
     pass
 
+import time as _time
+
+def _exec_retry(conn, sql, params=(), retries=5, wait=2):
+    """DB写操作自动重试(database is locked时指数退避)"""
+    for attempt in range(retries):
+        try:
+            return conn.execute(sql, params)
+        except sqlite3.OperationalError as e:
+            if "locked" in str(e).lower() and attempt < retries - 1:
+                _time.sleep(wait * (attempt + 1))
+                print(f"  [DB锁重试{attempt+1}/{retries}] {wait*(attempt+1)}s", flush=True)
+            else:
+                raise
+    return None
+
+
 DB_PATH = Path("/home/hmo/MoFin/data/mofin.db")
 
 # 2026-08-10 修复参数：控制单次运行时长，防 hermes 600s 超时杀进程