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Financial Data Modelling
Section 4 of 9
Double-entry bookkeeping implemented in SQL, immutable event sourcing, ACID transactions at scale, DynamoDB single-table design, and zero-downtime schema migrations
3 hours•advanced
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Key Takeaways
- •Every financial transaction requires two ledger entries (debit + credit) — the balance must always sum to zero
- •Financial ledgers are append-only — never UPDATE or DELETE transaction rows, only INSERT
- •SELECT FOR UPDATE and optimistic locking are the two tools for preventing concurrent balance corruption
- •DynamoDB single-table design with conditional writes enables idempotent payment records without transactions
- •Expand-contract migration pattern allows zero-downtime schema changes on high-throughput financial tables
📝Personal Notes
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