BASTDAYS (Happy bank)

I made one of the rich's tools mentioned in the bestseller "Titan's Tools" into an app.
Every time you have the best things, you can easily and simply record them, and at some point, you can see that the best things that have happened to you have accumulated.
It will be a great help to feel that you are a happy person by replaying the best moments that have happened to you through this app when you have a hard time in your life.

Now! Fill 100 of the best days through this app and you will feel the change in your life.
When it reaches 100, something appears in the pot of the app. What could it be?