Golang Microservices Full Course #41 - Object Storage MinIO for Outbox Archiving
Build a Wallet App with Go – EP41: Transactional Outbox Archiving with MinIO
PR Github = https://github.com/bashocode/gowallet...
In Episode 41, we extend our event-driven architecture by implementing an *Outbox Archiver* that periodically moves processed events from the database to **MinIO Object Storage**. Instead of keeping every processed outbox record in MySQL forever, we'll archive historical events as JSON files, upload them to MinIO, and safely remove archived rows from the database.
To keep our architecture clean, the archiving process runs inside a dedicated *Scheduler Service**, while the **Transaction Service* remains responsible for owning and exposing outbox data through gRPC. This separation of concerns keeps each service focused on its own responsibilities while improving long-term scalability and storage efficiency.
📚 What You'll Learn
Why processed outbox events should be archived
Building an Outbox Archiver Worker
Scheduling background jobs in the Scheduler Service
Using gRPC to fetch and delete archived events
Integrating MinIO as S3-compatible object storage
Uploading batched JSON archives to MinIO
Safely deleting archived rows only after successful uploads
Organizing archive files using date-based partitions
Designing long-term audit storage for event-driven systems
Best practices for production-ready event retention
By the end of this episode, your Wallet application will automatically archive processed outbox events into **MinIO Object Storage**, reducing database growth while preserving a complete historical audit trail. This architecture is commonly used in production systems to balance database performance, operational cost, and long-term data retention.
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