[Bug] Rules could add a corrupt media item if ran at the same time as collection handling

[jorenn92]

By default, rule handling and collection handling run concurrently every third iteration of the day, potentially leading to corrupted media items.

This occurs when the collection handler removes an item that the rule handler has already parsed and intends to add again.

Although this issue is not critical, as a maintenance job later removes the record, a solution would be to ensure that the collection handler waits until the rule handler is finished, or vice versa.