It can’t be through a company cloud system though, it’s got to be local only.

Sorry, the best we can do is only having one data breach every six months, and the toilet refusing to flush if the internet ever goes out.

How does the system handle skid marks?

Also add a camera directed at the butthole to save water if it was poop or no. Also to show a progressbar of how things r going. Just make sure to stream the video unencrypted to the cloud.

You're forgetting the cardinal rule of home automation. Everything must also work "normally" if HA were to go down.

Do you sometimes forget to flush?

You can probably build something with a smart valve. The mechanism for flushers is really simple.

What about mercy flushes? Air freshener can be as bad or worst then the odor you are trying to coverup.