When was the Star of David invented

IMHO King David, who according to the Jewish tradition composed Psalms, invented the concept of the Shield of David. In Chapter 18:3 King David prays to the Lord, using the word shield - and that's when the concept of the Shield of David entered our world.
It happened around 1010 BCE, after escaping from King Saul, a few years before 1004 when David became a king. He ruled until 965 BCE and lived, like us, in the turn of a millennium...