The original title is: "Show Dev: Self-reinforcing K-pop data pipeline using Spring Boot and pgvector (Built on OCI Free Tier)"

Short summary

A developer from Seoul shares architectural patterns for k-cosmos, an interactive 3D K-pop vector-embedding visualization. Key solutions: three-phase transaction boundaries to prevent HikariCP exhaustion when calling external APIs, SQL window functions enforcing artist diversity in recommendations, and budget randomization distributing daily LLM quotas across the task pipeline.

• •Three-phase transaction pattern eliminates connection pool exhaustion from async external I/O
• •SQL window functions enforce artist diversity to prevent recommendation echo chambers
• •Budget randomization distributes daily LLM quotas evenly across task queue

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