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domain-fintechtransaction-processing

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更新日2026年3月3日 12:24

Guides transaction processing: ACID guarantees for financial operations, idempotency (idempotency keys, deduplication), distributed transactions (saga with compensating transactions), settlement workflows, batch processing, reconciliation, and transaction lifecycle state management. Use when implementing payment flows or financial operations.

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rnavarych

rnavarych/alpha-engineer

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Transaction Processing

When to use

Implementing atomic balance transfers with correct isolation levels
Adding idempotency keys to payment endpoints
Designing saga-based distributed payment flows with compensating transactions
Modelling settlement cycles (T+0, T+1, T+2) and netting/clearing processes
Building three-way reconciliation (internal, external, cross-system)
Defining transaction state machines with enforced valid transitions

Core principles

SERIALIZABLE isolation for balance mutations — REPEATABLE READ is the floor, never lower
Idempotency is not optional — every mutating payment endpoint needs a key; at-least-once delivery is a guarantee, not an edge case
Orchestrated sagas over choreography — financial workflows need a single audit trail, not distributed event soup
Compensating transactions must also be idempotent — a failed rollback is worse than a failed forward step
Never delete transactions — COMPLETED, FAILED, REVERSED are terminal; the ledger is append-only

Reference Files

references/acid-idempotency.md — transaction isolation levels, SELECT FOR UPDATE, atomic transfer SQL pattern, idempotency key schema, deduplication with request hashing, exactly-once semantics
references/saga-settlement.md — choreography vs orchestration trade-offs, compensating transactions, saga state machine diagram, settlement cycles (T+0/T+1/T+2), netting and clearing process, idempotent batch processing
references/reconciliation-lifecycle.md — three-way reconciliation (internal/external/cross-system), daily reconciliation process, break resolution SLAs, transaction state machine (PENDING through REVERSED), state transition enforcement

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name	domain-fintech:transaction-processing
description	Guides transaction processing: ACID guarantees for financial operations, idempotency (idempotency keys, deduplication), distributed transactions (saga with compensating transactions), settlement workflows, batch processing, reconciliation, and transaction lifecycle state management. Use when implementing payment flows or financial operations.

Transaction Processing

When to use

Implementing atomic balance transfers with correct isolation levels
Adding idempotency keys to payment endpoints
Designing saga-based distributed payment flows with compensating transactions
Modelling settlement cycles (T+0, T+1, T+2) and netting/clearing processes
Building three-way reconciliation (internal, external, cross-system)
Defining transaction state machines with enforced valid transitions

Core principles

SERIALIZABLE isolation for balance mutations — REPEATABLE READ is the floor, never lower
Idempotency is not optional — every mutating payment endpoint needs a key; at-least-once delivery is a guarantee, not an edge case
Orchestrated sagas over choreography — financial workflows need a single audit trail, not distributed event soup
Compensating transactions must also be idempotent — a failed rollback is worse than a failed forward step
Never delete transactions — COMPLETED, FAILED, REVERSED are terminal; the ledger is append-only

Reference Files

references/acid-idempotency.md — transaction isolation levels, SELECT FOR UPDATE, atomic transfer SQL pattern, idempotency key schema, deduplication with request hashing, exactly-once semantics
references/saga-settlement.md — choreography vs orchestration trade-offs, compensating transactions, saga state machine diagram, settlement cycles (T+0/T+1/T+2), netting and clearing process, idempotent batch processing
references/reconciliation-lifecycle.md — three-way reconciliation (internal/external/cross-system), daily reconciliation process, break resolution SLAs, transaction state machine (PENDING through REVERSED), state transition enforcement