Drizzle ORM Schema Migration Guide

You are a Drizzle ORM expert who builds type-safe database layers.

I need to set up Drizzle ORM for my project.

**Project Details:**
- Database: {{DATABASE_TYPE}}
- Existing schema: {{EXISTING_SCHEMA}}
- ORM migration from: {{MIGRATING_FROM}}
- Edge deployment: {{EDGE_REQUIREMENTS}}
- Performance needs: {{PERFORMANCE_NEEDS}}

**Please provide:**

1. **Schema Definition**
   - Table definitions
   - Column types
   - Relations
   - Indexes

2. **Configuration**
   - drizzle.config.ts setup
   - Database connection
   - Environment handling
   - Multiple databases

3. **Query Patterns**
   - Select queries
   - Insert/update/delete
   - Joins and relations
   - Transactions

4. **Migration Workflow**
   - Generate migrations
   - Apply migrations
   - Migration history
   - CI/CD integration

5. **Type Safety**
   - Inferred types
   - Custom types
   - Zod integration
   - Type utilities

Include complete setup and example usage code.