Fix quarterly payment schedule to correct advance payment dates

- Q1: Due December 15 (previous year)
- Q2: Due March 15
- Q3: Due June 15
- Q4: Due September 15

Added new management command fix_quarterly_payment_schedule to update existing payments
This commit is contained in:
2025-10-01 13:12:52 +02:00
parent 6adedc71c5
commit c3e0cc0f6a
7 changed files with 40452 additions and 7 deletions