selfspy/selfspy ? reverse-engineered prompt

Build me a desktop app that quietly runs in the background and keeps track of what I do on my computer so I can look back later and see useful stats and reminders.

I want it to work on Unix X11, Mac, and Windows if possible, and store everything in a local SQLite database. It should remember app names, window titles, mouse clicks, key counts, and typing activity, and it should be able to hide or encrypt the actual text I type unless I choose otherwise. Please make it start automatically when I log in, and give me a simple command line way to launch it, set a data folder, and change the password later.

Also build a companion way to search and summarize the history, so I can ask things like what I worked on recently, what I typed in a certain app, or see activity by date and time. Keep it simple to use, and if you need current docs for any old libraries or platform setup, look them up online.