Currently, message.service is a boolean telling you whether the current message is a service message or not, but doesn't tell anything about the type (https://docs.pyrogram.org/telegram/base/message-action). One issue with this is when, for example, a pinned message is deleted immediately and the service message will hold no pinned message. Storing a string from an enum would be better (something like "pin", "phone_call", "screenshot_taken", "chat_edit_photo", ...).