GraceDB popup before confirming the advocate signoff
Before making/changing/deleting Advocate Signoff, "are you really sure?" type dialog box should be displayed. See the comment of @nicolas.arnaud in https://git.ligo.org/emfollow/followup-advocate-guide/-/issues/91:
Yesterday we had the case of a Lv0 shifter who used the advocate signoff interface on the wrong superevent... While what follows won't prevent this from happening again, I would suggest adding to the section https://emfollow.docs.ligo.org/followup-advocate-guide/procedures1.html#sign-off-okay-on superevent (and possibly to https://emfollow.docs.ligo.org/followup-advocate-guide/procedures1.html#sign-off-not-okay-on-superevent as well) the fact that, when pressing the signoff button, the action is not immediate. Instead, a popup window appears with an appropriate message (depending on what the action will be)
You are attempting to create an Advocate Sign-Off, which will generate a public alert. Do you wish to continue?
You are attempting to update an Advocate Sign-Off. Do you wish to continue?
You are attempting to delete an Advocate Sign-Off. Do you wish to continue?
And, at this stage, the shifter should really pause for a few seconds, review what they are about to do and (only) then press OK or cancel.