/database

Implement database layer only: migrations, models, schemas, indexes, and validation for a feature.

# Database Layer Operation

Implement database layer only: migrations, models, schemas, indexes, and validation for a feature.

## Parameters

**Received**: `$ARGUMENTS` (after removing 'database' operation name)

Expected format: `description:"database changes needed" [migration:"migration_name"] [orm:"prisma|typeorm|sequelize"]`

## Workflow

### 1. Understand Database Requirements

Parse the requirements and clarify:
- What tables/collections need to be created or modified?
- What are the relationships between entities?
- What queries will be frequently executed (for index design)?
- Wha...