When you build a standard Rails app, PostgreSQL (or MySQL) is your best friend. It handles your users, your posts, and your billing perfectly.

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A step-by-step guide to integrating ClickHouse into a Ruby on Rails application for high-performance analytics. Explains why columnar databases like ClickHouse outperform PostgreSQL for large-scale event tracking, and walks through setup using the clickhouse-activerecord gem, configuring multiple databases in database.yml, creating a base ClickhouseRecord model, and querying analytics data with standard ActiveRecord syntax.

A Beginner’s Guide to ClickHouse in Ruby on Rails