feat(events): 每个事件生成对应时间点画面截图 - oracle_db.mark_video_processed 返回 event_ids；video_processor 按事件时间戳-视频起始时间偏移跳帧截图存 ev_{id}.jpg；新增 /api/oracle/event/{id}/thumb 接口；fam-ui 事件列表每条显示对应截图

fam-edge/src/fam_edge/oracle_db.py

@@ -157,7 +157,8 @@ class OracleDB:
         return cur.fetchall()
 
     def mark_video_processed(self, video_id: int, summary: str, events: List[dict],
-                            people: List[str], compute_provider: str):
+                            people: List[str], compute_provider: str) -> List[int]:
+        """落库视频结果；返回新插入事件的 id 列表（与 events 参数一一对应，供事件截图用）"""
         now = _now_iso()
         self._conn.execute(
             "UPDATE videos SET status='done', summary_json=?, events_json=?, "
@@ -166,14 +167,17 @@ class OracleDB:
              compute_provider, now, now, video_id))
         # 事件落独立表，便于 NAS 拉取
         self._conn.execute("DELETE FROM events WHERE video_id=?", (video_id,))
+        event_ids: List[int] = []
         for ev in events:
-            self._conn.execute(
+            cur = self._conn.execute(
                 "INSERT INTO events (video_id, ts, description, person_list_json, "
                 "is_attention_event) VALUES (?,?,?,?,?)",
                 (video_id, ev.get('timestamp', ''), ev.get('description', ''),
                  json.dumps(ev.get('people', []), ensure_ascii=False),
                  1 if ev.get('is_attention_event') else 0))
+            event_ids.append(cur.lastrowid)
         self._conn.commit()
+        return event_ids
 
     def mark_video_failed(self, video_id: int, error: str = ''):
         now = _now_iso()