I use containers for lots of things. For example Reddit, I want to delete all cookies, but be able to log into my account when choosing the container.
Currently all I can do is whitelist the domain from getting cleared, but this includes the non-containered one too, which I would use most of the time and want to clear.
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Similar ideas here on Connect:
Automatically delete cookies only for some "Multi-Account Containers"
Container-by-container history management