I am at a total loss as to what this mystery signature is! About every 4 seconds my usage drops by ~225W and then goes back moments later. It’s been repeating like this since 9:19.26AM today and has happened other days but does not run at night.
Start flipping breakers and try and figure out what is connected to the breaker once the signature turns off.
Since you don’t see a peak when it switches on, i don’t think it is any kind of motor.
Probably some heater element, but 235 Watt isn’t really that much.
What is on during the day but off during the night?
What devices you have that have a timer included?