I’ve searched a bit and could not find anything related. My suggestion is to add some kind of “Admin message” to the activity tab.
I’ve had some instances where I needed to change a table’s name, composition, or something like that. I’d like to be able to pin a message there (or, actually, anywhere), so my users could see the relevant updates.
Sorry, no blinking … that was just a failed attempt from me trying to be funny.
But the emoji ️ warning sign among other stuff can be used as part of text/title of pinned element if your client has rendering support for it in your browser/OS (like referenced in the first few lines of https://en.m.wikipedia.org/wiki/Emoji).