The CQRS and Event Sourcing Paradigm

When To Use

• Designing event-sourced systems with complex domain logic
• Systems requiring full audit trails of state changes

When NOT To Use

• Simple CRUD applications without complex domain logic
• Small projects where event sourcing adds unnecessary complexity

When to Employ This Paradigm

• When read and write workloads have vastly different performance characteristics or scaling requirements.
• When all business events must be captured in a durable, immutable history or audit trail.
• When a business needs to rebuild projections of data or support temporal queries (e.g., "What did the state of this entity look like yesterday?").

Adoption Steps

1. Identify Aggregates: Following Domain-Driven Design principles, specify the bounded contexts and the business invariants that each command must enforce on an aggregate.