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Marcel PeterkauandClaude Sonnet 5
2484a1631d
Members are sometimes given a fee that deviates from the regular schedule -- e.g. a reduced rate for students -- for a specific period. Add a per-member "Beitrag" tab where such deviations can be recorded with a month-granular date range (Ab/Bis), a mandatory reason, and either a fixed annual amount or a percentage discount off whichever base rate is in effect at the time. Data model: ContributionData gets a contribution_overrides list, each entry validated (month format, Bis >= Ab, non-overlapping ranges per member, reason required) and CRUD'd through the repository (record/update/delete/get_contribution_override), consistent with how donations already work. Integration: contribution_claims.py now computes each membership-fee claim's amount month by month instead of a single rate for the whole billing period, picking up whichever override (if any) covers each individual month. That handles an override starting or ending mid period correctly (e.g. a semiannual payer whose discount begins in March) without changing behavior for members without overrides. Already-created claims are never recalculated retroactively, matching how changes to the global contribution rates already behave. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>