[4-h] Отсутствует видеозапись таймспана/не приходит с бэка

この issue には説明がありません。

The issue title suggests missing video recordings or a backend failure to deliver a timespan. Start by examining the video processing and streaming modules in the backend, likely involving Django views or DRF serializers. Look for error logs related to video generation or API endpoints that serve recordings. Check the integration between the video monitoring system and the database to see where the pipeline breaks.

索引モデルが issue の本文から書いたものです。