Date: &Date
  type: string
  format: date
  pattern: '^\d{4}-\d{2}-\d{2}$'
  description: Date in ISO 8601 format
  example: '2025-12-13'

DateTime: &DateTime
  type: string
  format: date-time
  description: Timestamp in ISO 8601 format
  example: '2025-12-13T18:00:00.000Z'

Ticker: &Ticker
  type: string
  pattern: '^[A-Z0-9]+$'
  description: Stock, ETF, or crypto ticker symbol
  example: 'AAPL'

Currency: &Currency
  type: string
  pattern: '^[A-Z]{3}$'
  description: ISO 4217 currency code
  example: 'USD'

ErrorResponse: &ErrorResponse
  type: object
  properties:
    error:
      type: string
      description: Error message
    detail:
      type: string
      description: Detailed error information
  required:
    - error
  example:
    error: "Invalid ticker symbol"
    detail: "Ticker 'XYZ123' not found"