can you please add a way to lock an entire message history with one person? rather than just locking a single text message. I recently somehow deleted all of my messages with all of my contacts, and I don't even know how I did it. I save just about everything and refer back to to many message histories. while we're at it, please make it less easy to delete all messages. I'm confused why this happened. usually when I delete a message, if I search for the person and start typing, the message history reappears. so I'm unsure how I cleared everything with no ability to get it back.