Articles written by 'Haruhiko Nishi'

Haruhiko Nishi

Long-time software developer in the adtech field and Apache Pekko enthusiast.

Never Call APIs Inside Database Transactions

33 min read • Apr 20, 2026 • Guide

Intermediate

pekko

postgresql

microservices

Learn why calling external APIs inside database transactions leads to inconsistent state and how to fix it with Transactional Outbox, Result Tables, and Saga Compensation patterns, with a complete working implementation in Scala

Haruhiko Nishi