Hi!
Thank you for replying so quickly.
I defined all things, items, rules on OH WebUI. So I have no textual definitions of that.
What I do with the VideoURL item is displaying a cycling video on the summary page of OH3 of each cameras inside of an image card. It is also defined within WebUI.
I can confirm that based on J-N-K’s suggestion I unlinked both items from channels and no memory accumulation can be observed.