HDL for last standard earnings date

Summary: Update terminate payroll assignments to earlier LSED, LSPD, and Final Close dates via HDL

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We are converting employees to a new payroll definition and originally converted with an incorrect date. We need to change the last standard earnings date, last standard process date, and final close date to earlier dates. When using AssignedPayroll.dat, it won’t allow the changes to LSPD and Final Close as the Last Standard Earnings date can’t be updated. The only way I can find to fix this is by manually “reverse terminate payroll” in the payroll assignment and then reload termination dates, but this is not feasible to do through the UI with 20,000+ records. How can I accomplish via HDL load either 1)