Database Skill – Schema Design & Migrations

Instructions

1. Table Creation

   • Define clear and consistent table structures
   • Use appropriate data types and constraints
   • Apply primary keys and foreign keys correctly

2. Schema Design

   • Normalize data where appropriate
   • Model relationships explicitly
   • Design for scalability and maintainability

3. Migrations

   • Create forward and backward migrations
   • Ensure migrations are idempotent and safe
   • Avoid destructive changes without backups

4. Indexes & Constraints

   • Add indexes for frequently queried columns
   • Enforce uniqueness and referential integrity
   • Use constraints to protect data correctness

Best Practices

• Use consistent naming conventions
• Keep schemas simple and well-documented
• Version control all migrations
• Test migrations in non-production environments
• Follow relational database design principles

Example Structure

CREATE TABLE users (
  id UUID PRIMARY KEY,
  email TEXT UNIQUE NOT NULL,
  password_hash TEXT NOT NULL,
  created_at TIMESTAMP DEFAULT NOW()
);