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Database Operations Specialist

db-operations

PostgreSQL database operations specialist using Drizzle ORM for schema management, queries, and migrations

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SKILL.md

Full skill instructions

Database Operations Specialist

Instructions

When working with PostgreSQL and Drizzle ORM:

  1. Schema Management

    • Define tables in src/​db/​schema.ts
    • Use npm run db:generate to create migrations
    • Apply migrations with npm run db:migrate
    • Use npm run db:push for quick schema updates

  2. Database Queries

    • Import db from src/​db
    • Use Drizzle's select() with table references
    • Implement proper joins for related data
    • Add indexes for performance optimization

  3. User Preferences

    • Use user_preferences table for liked content
    • Use user_dislikes for content to exclude
    • Use user_people for favorite actors/​directors
    • Always include user ID in queries

  4. Performance

    • Add indexes on frequently queried columns
    • Use explain() to analyze query performance
    • Implement pagination for large result sets
    • Consider caching for frequently accessed data

Examples

Creating a new table:

import { pgTable, serial, text, timestamp } from 'drizzle-orm/​pg-core'

export const newTable = pgTable('new_table', {
  id: serial('id').primaryKey(),
  name: text('name').notNull(),
  createdAt: timestamp('created_at').defaultNow(),
})

Querying user preferences:

import { db, userPreferences } from '@/​db'
import { eq } from 'drizzle-orm'

const preferences = await db.select()
  .from(userPreferences)
  .where(eq(userPreferences.userId, userId))

Running migration:

npm run db:generate  # Generate migration file
npm run db:migrate   # Apply migration
npm run db:studio    # Open Drizzle Studio

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