{
  "name": "Sample Customer Schema",
  "description": "A sample schema for customer data generation",
  "fields": [
    {
      "name": "customer_id",
      "type": "integer",
      "subtype": "id",
      "description": "Unique customer identifier",
      "constraints": {
        "unique": true,
        "min_val": 1,
        "max_val": 999999
      }
    },
    {
      "name": "first_name",
      "type": "text",
      "subtype": "name",
      "description": "Customer first name",
      "constraints": {
        "null_percentage": 2
      }
    },
    {
      "name": "last_name",
      "type": "text",
      "subtype": "name",
      "description": "Customer last name",
      "constraints": {
        "null_percentage": 2
      }
    },
    {
      "name": "email",
      "type": "text",
      "subtype": "email",
      "description": "Customer email address",
      "constraints": {
        "unique": true,
        "null_percentage": 1
      }
    },
    {
      "name": "age",
      "type": "integer",
      "subtype": "age",
      "description": "Customer age",
      "constraints": {
        "min_val": 18,
        "max_val": 80,
        "null_percentage": 2
      }
    },
    {
      "name": "signup_date",
      "type": "date",
      "subtype": "signup_date",
      "description": "Customer signup date",
      "constraints": {
        "start_date": "2020-01-01",
        "end_date": "2024-12-31"
      }
    }
  ]
}