Postgresql

Build a Notification Service from Scratch — Part 1: Architecture and Database Design

Part 1: Design a multi-channel notification service architecture. Covers database schema for email, SMS, and push notifications with template management.

Build a URL Shortener from Scratch — Part 2: Database Schema and Base62 Encoding

Part 2: Design PostgreSQL schema for URL shortener with Alembic migrations. Implement Base62 encoding/decoding for short code generation.

How to Master PostgreSQL Indexing: B-Tree, Composite, and Partial Indexes

Learn PostgreSQL indexing with B-tree, composite, and partial indexes. Use EXPLAIN ANALYZE to verify query plans and avoid common indexing pitfalls.

How to Dockerize a Rails Application with PostgreSQL and Redis

Step-by-step guide to containerize a Ruby on Rails application with PostgreSQL and Redis using Docker and docker-compose. Production-ready setup included.

Fix: PostgreSQL 'password authentication failed for user' Error

Resolve PostgreSQL password authentication failures. Covers pg_hba.conf, role passwords, Docker-specific issues, and local trust configuration.

Fix: PostgreSQL 'relation does not exist' Error

Solve the 'relation does not exist' error in PostgreSQL. Covers schema search paths, missing migrations, and case-sensitive naming.

Fix: PostgreSQL 'duplicate key violates unique constraint' Error

Resolve PostgreSQL duplicate key violation errors. Understand unique indexes, race conditions, UPSERT, and transaction isolation.

Fix: PostgreSQL Data Not Persisting After Docker Container Restart

Prevent data loss when restarting PostgreSQL Docker containers. Covers volumes, bind mounts, named volumes, and how to verify persistence.