Shalom When was the canon of the Jewish bible first established?

The last book to enter the Tanach/Jewish Bible, is Esther, which occurred, was written and entered around the year 500 BCE. [Nevertheless, there were different opinions around the year 100 CE whether Ecclesiastes and the Song of Songs (which were written by Solomon about the year 1000 BCE) should stay in, for the masses may easily misunderstand them. It was decided to leave them in.]