Your Rails Apps Postgres Is Probably Unhealthy

📰 Dev.to · emum

Learn how to identify and fix common Postgres health issues in Rails apps, such as unused indexes and bloat, using the Lantern gem

intermediate Published 31 Mar 2026
Action Steps
  1. Add the lantern-rails gem to your Rails app to automate Postgres health checks
  2. Configure Lantern to collect pg_stat metrics every 5 minutes through your existing ActiveRecord connection
  3. Check the health score and metrics, such as cache hit ratio, index usage, and bloat, to identify potential issues
  4. Use the metrics to optimize your database, such as removing unused indexes and vacuuming tables
  5. Monitor your database health over time to catch potential issues before they become major problems
Who Needs to Know This

Developers and DevOps teams working with Rails and Postgres can benefit from this knowledge to improve database performance and reduce potential issues

Key Insight

💡 Regularly monitoring and maintaining your Postgres database is crucial to prevent performance issues and data corruption

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🚨 Is your Rails app's Postgres database unhealthy? 🚨 Learn how to identify and fix common issues with the Lantern gem #rails #postgres #devops

Key Takeaways

Learn how to identify and fix common Postgres health issues in Rails apps, such as unused indexes and bloat, using the Lantern gem

Full Article

Title: Your Rails Apps Postgres Is Probably Unhealthy

URL Source: https://dev.to/emum/your-rails-apps-postgres-is-probably-unhealthy-2nl0

Published Time: 2026-03-31T20:11:34Z

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Posted on Mar 31

# Your Rails Apps Postgres Is Probably Unhealthy

[#rails](https://dev.to/t/rails)[#postgres](https://dev.to/t/postgres)[#ruby](https://dev.to/t/ruby)[#devops](https://dev.to/t/devops)

A few Rails apps I have worked on have unused indexes silently slowing down writes, tables that havent been vacuumed in weeks, and bloat creeping up with nobody noticing. You can check these things manually with pg_stat queries but nobody does it consistently.

I built Lantern to automate this. You add the lantern-rails gem and it collects pg_stat metrics every 5 minutes through your existing ActiveRecord connection. You get a 0-100 health score covering cache hit ratio, index usage, bloat, vacuum health, and connection utilization. It also tags each snapshot with your git SHA so you can see which deploy changed your metrics.

On my own production app it found 12 unused indexes, 5 tables that had never been vacuumed, and a bloat ratio of 12.7 percent. No credentials leave your app, no Redis, no external agent.

Free tier is 1 database with 3 day his
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