Request: Run certain commands only once for multiple files

[caco3]

Currently a task is added to the scheduler for every individual file. This can be inefficient.

Example:

1. The camera uploads a larger group of photos within a short time.
2. Each photo creates a task
3. All tasks get run one after the other on the next cron run.

Most scripts need to have the occ files:scan after their work, how ever that can be slow.

Idea:

Add a way that a script only gets run after all other tasks in one cron intrerval got run.