security-rls-performance

Poorly written RLS policies can cause severe performance issues. Use subqueries and indexes strategically.

Skills
Databases
0

What it does and how to use it

A skill that teaches Claude Code to do databases tasks well. It is packaged knowledge the model uses whenever it is relevant.

Install the skill (command above).
In Claude Code, describe what you need - the skill turns on by itself when the context fits.
No commands to memorize: you talk in plain language and the skill does the rest.

Install (Claude Code)

mkdir -p .claude/skills/security-rls-performance && curl -fsSL https://doutorai.pt/data/lib/skills__security-rls-performance.md -o .claude/skills/security-rls-performance/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

---
title: Optimize RLS Policies for Performance
impact: HIGH
impactDescription: 5-10x faster RLS queries with proper patterns
tags: rls, performance, security, optimization
---

## Optimize RLS Policies for Performance

Poorly written RLS policies can cause severe performance issues. Use subqueries and indexes strategically.

**Incorrect (function called for every row):**

```sql
create policy orders_policy on orders
  using (auth.uid() = user_id);  -- auth.uid() called per row!

-- With 1M rows, auth.uid() is called 1M times
```

**Correct (wrap functions in SELECT):**

```sql
create policy 

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