Is there a query that returns all valid grades ever associated with a position with eff dates

We found an issue on Positions where Valid Grades, previously deleted via HDL, are returning as a valid grade in the UI when any change is made on the Position itself. While working through SR# 4-0000527207, we received the below queries from Oracle to identify the positions and associated valid grades with effective dates. The clean

The original start date that the grade was added to a position needs to be captured in order to end-date it via HDL. Using the specific position codes, run Query 1 to obtain Position ID, Grade ID, and the dates related to grade start/end