I too started taking photos on my phone. It's not a solution, it's a safety behaviour. The trouble with safety behaviours is that they can stop working after a while and then you're in trouble.

That's a very practical and straightforward way of addressing it, a really good idea.

In my case I very occasionally worry about having left the gas stove on in the kitchen after cooking, and what usually works, in a way similar to the pictures you take I guess, is re-tracing my actions just before and after switching the gas off. This way I can actually visualize how I turned off the gas just before draining the pasta in the sink or whatever.

This works if I remember something particular about that specific occasion tho, but it usually does the thing.

I found it helped my compulsion to repeatedly check if I locked a door was to check, and then say, out loud, to myself, "OK, it's locked." Just throwing it out there for someone else.

Hey, perhaps a life-blogging camera would be the ultimate solution :)

I must admit that I occasionally look at the Hive app and conclude that if our house is at 18C then it probably isn't on fire... :-)