I would like to find data that describe every player contract in the NBA, as far back into the past as possible. Optimally, this would include salary, term of contract, player agency, etc.
I search extensively and could not find. It seems that USATODAY had a similar database, but now they only have it for MLB, as in this link.
Can someone propose a source where I can find these data for an NBA, as detailed as possible and ranging over as many years as possible? Thank you kindly.