event-store-design

This skill provides a comprehensive framework for engineering event stores, the critical backbone of event-sourced architectures. It is designed for software architects and backend developers tasked with choosing or building persistence mechanisms that support immutable event streams, high-throughput writes, and reliable event replays. The skill emphasizes the fundamental principles of event sourcing, such as append-only storage, temporal versioning, and optimistic concurrency control, ensuring that your system maintains a consistent and audit-ready source of truth. Users can leverage this skill to navigate the complexities of distributed system storage, whether opting for specialized databases or implementing custom solutions on general-purpose infrastructure.

• Architecture design for stream-based event persistence, including global and stream-level ordering.

• Technology evaluation framework comparing EventStoreDB, PostgreSQL, Kafka, DynamoDB, and Marten.

• Implementation guidance for append-only patterns, idempotency checks, and real-time subscription notifications.

• Schema design best practices for high-performance event retrieval, indexing, and snapshot management.

• Strategies for optimistic concurrency control to prevent write conflicts in distributed environments.

• Guidance on integrating JSONB or other semi-structured formats for flexible event payload storage.

• Suitable for building microservices using Event Sourcing or CQRS (Command Query Responsibility Segregation) patterns.

• Recommended for planning event store scaling, migration, and long-term storage optimization.

• Requires familiarity with relational databases or log-based messaging systems, as templates cover PostgreSQL-specific implementation and asynchronous interaction patterns.

• Useful for setting up subscription checkpoints to manage event replay logic and consumer state management.

• Inputs typically involve domain event definitions, aggregate identifiers, and concurrency requirements; outputs include schema definitions and service-layer code structures for event persistence.