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49 lines
1.6 KiB
Markdown
49 lines
1.6 KiB
Markdown
# HOUSEBOT-077 Custom Rent Split Weights
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## Summary
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Support unequal room rents by storing a deterministic rent-share weight per active household member and using those weights in monthly settlement calculations.
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## Goals
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- Preserve equal split as the default when all member weights are `1`.
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- Allow household admins to edit per-member rent weights from the mini app.
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- Keep settlement math deterministic and money-safe.
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- Reflect weighted rent shares consistently in statements and dashboard views.
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## Non-goals
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- Per-cycle rent weights.
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- Free-form percentage editing.
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- Automatic square-meter or room-type calculations.
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## Scope
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- In: member-level `rentShareWeight`, settlement-engine support, admin API/UI, tests.
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- Out: historical backfill UI, move-in/move-out proration logic, rent history analytics.
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## Data Model Changes
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- Add `members.rent_share_weight integer not null default 1`.
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- Existing members migrate to `1`.
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## Domain Rules
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- Rent weights must be positive integers.
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- Active members participate in rent splitting according to their weight.
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- Utility splitting remains independent from rent splitting.
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- The same input must always produce the same minor-unit allocation.
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## Interfaces
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- Household admin mini app payload includes member `rentShareWeight`.
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- Admin write endpoint updates one member rent weight at a time.
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## Acceptance Criteria
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- [ ] Settlement engine uses weighted rent shares.
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- [ ] Equal split still holds when all weights are `1`.
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- [ ] Admins can edit member rent weights in the mini app.
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- [ ] Dashboard and statements reflect the new rent shares.
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- [ ] Validation rejects zero or negative weights.
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