Developer's Journey·5wMy Journey Making a Ecommerce's store
A developer shares their experience building a personal creator store to sell productivity tools and templates. They reflect on underestimating backend and database complexity, hitting real struggles with MongoDB clusters, Prisma schema design, and multi-app data sharing. The post frames these challenges as a necessary learning phase and outlines plans to integrate Patreon membership tiers with the store for a connected ecosystem.
Hacker News·5w5NF and Database Design
A deep dive into Fifth Normal Form (5NF) that argues traditional teaching approaches are unnecessarily confusing. The author critiques the Wikipedia example as poorly motivated and proposes starting from business requirements and a logical model instead. Two natural design patterns emerge: the AB-BC-AC triangle (three M:N junction tables connecting three entities) and the ABC+D star pattern (a central entity linked 1:N to three surrounding entities). Using ice cream preferences and concert musician examples, the post demonstrates that properly designed schemas are automatically normalized without needing to reason about 5NF decomposition explicitly. The post also covers composite vs. synthetic primary keys and how both patterns can coexist in the same schema.
freeCodeCamp·4wHow to Use PostgreSQL as a Cache, Queue, and Search Engine
A benchmark-driven exploration of using PostgreSQL as a replacement for Redis (caching), RabbitMQ (job queues), Elasticsearch (full-text search), and pub/sub systems. Two identical PostgreSQL 17 instances are compared — one using naive patterns, one using optimized built-in features like UNLOGGED tables, SKIP LOCKED, tsvector with GIN indexes, and LISTEN/NOTIFY. Key findings: tsvector+GIN delivers a 10x p95 improvement over ILIKE searches; SKIP LOCKED is production-ready for job queues; UNLOGGED tables give a consistent 13% write speedup; LISTEN/NOTIFY reduces pub/sub latency by 20% at p95. Under combined workload, the optimized setup adds ~15% overhead but stays under 10ms p95. The conclusion is that a well-configured PostgreSQL instance can replace 3-5 specialized services for most web applications, with clear guidance on where dedicated tools are still warranted.
Yelp Engineering·5wZero downtime Upgrade: Yelp’s Cassandra 4.x Upgrade Story
Yelp's Database Reliability Engineering team upgraded over a thousand Cassandra nodes from version 3.11 to 4.1 with zero downtime. The post covers their upgrade strategy including benchmarking (4% p99 latency improvement, 11% throughput gain, up to 58% p99 reduction on key clusters), compatibility challenges with Stargate proxy and Cassandra Source Connector, and a three-stage automated upgrade process (pre-flight, flight, post-flight). Key lessons include a Stargate 2.x regression causing slower range queries (resolved by downgrading to 1.x), schema disagreement on CDC-enabled clusters, and the value of running version-specific components in parallel during the transition. The upgrade was performed in-place via rolling restart on Kubernetes, avoiding the cost and complexity of a separate DC approach.
Trendyol Tech·5wSelf-Service Database Mobility: How We Built Trendyol’s Internal PostgreSQL Migration Platform
Trendyol's Database Platform team built a self-service PostgreSQL migration platform using Temporal.io to replace manual, DBA-intensive migration scripts. The platform addresses key challenges including WAL bloat, sequence synchronization, replication slot continuity, and safe cutover mechanics. It uses a hybrid pg_dump + logical replication approach with parallel restore, DDL safeguards via event triggers, and intentional human approval gates at critical decision points. The result is a system where teams can trigger migrations autonomously while DBAs retain strategic oversight, reducing migration time from days or weeks of constant attention to a largely automated process.