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check-index-usage

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Detects missing database indexes in PHP code. Identifies unindexed WHERE/JOIN columns, incorrect composite index order, covering index opportunities, and index-defeating patterns.

skills/check-index-usage/SKILL.md

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# Database Index Usage Audit

Analyze PHP code for missing or suboptimal database index usage.

## Detection Patterns

### 1. WHERE Clause Without Index

```php
// CRITICAL: Filtering on unindexed column
$qb->select('o')
    ->from(Order::class, 'o')
    ->where('o.status = :status')          // Is 'status' indexed?
    ->andWhere('o.createdAt > :date')      // Is 'createdAt' indexed?
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