Generate timestamp from min and max date for any key with 1 second step

[aa12345]

Hello,

I want to create Qlik sense app.

I have a sample data like this:

I want to generate all timestamp for any (User with his action) with 1 second step. the result be like this :

thank you. 

[aa12345]

There is a sample data. 

Init Data sheet is the initial data and Final data is the expected result.

thank.