Event Sourcing over CRUD for Audit Trails

The team decided to move from standard CRUD in PostgreSQL to Event Sourcing for financial transaction audit trails to ensure compliance. Database triggers were considered but rejected because they lose business context - they only see row changes without knowing why the change happened or the user intent behind it. Instead, the team will use Event Sourcing with Kafka to store immutable domain events (TransactionCreated, TransactionApproved, StatusUpdated) and build materialized views in Postgres for fast reads. Reference: Martin Fowler's Event Sourcing Pattern article. Implementation involves src/services/transactionService.ts (event producers) and src/events/eventStore.ts (consumer/store logic).