majiayu000/claude-arsenal
xiaohongshu
xiaohongshu
286 148
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Ledger Guideline
ledger
Financial ledger - transactions, audit trails. Use when tracking money.
SKILL.md
Full skill instructions
Ledger Guideline
Tech Stack
- Payments: Stripe
- Database: Neon (Postgres)
- ORM: Drizzle
Non-Negotiables
- Balances must be immutable ledger (append-only), not mutable fields
- No floating-point for money (use deterministic precision)
- All financial mutations must be idempotent
- Monetary flows must be reconcilable with Stripe
Context
Financial systems are unforgiving. A bug that creates or destroys money — even briefly — is a serious incident. Users trust us with their money; that trust is easily lost and hard to regain.
If balance/credits/wallet exists, it must be bulletproof. If it doesn't exist yet, consider whether the current design would support adding it correctly. Retrofitting financial integrity is painful.
Driving Questions
- Does a balance/credits system exist, and is it implemented correctly?
- Where could money be created or destroyed by a bug?
- What happens during concurrent transactions?
- How would we detect if balances drifted from reality?
- Can we prove every balance by replaying the ledger?
- What financial edge cases (refunds, disputes, chargebacks) aren't handled?
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