CostRateState

"""
A versioned cost rate with date-range based validity. Supports audit trail via version linking.
"""
type CostRateState @iac_resource(name: "cost_rate") @iac_ops(create: "createCostRate", read: "getCostRate", update: "updateCostRate", delete: "deleteCostRate") {
  """Unique identifier"""
  id: CostRateID! @iac_identity(assignedBy: SERVER) @iac_computed
  """Associated cost category ID"""
  costCategoryId: CostCategoryID! @iac_ref(resource: "cost_category")
  """Associated cost center ID (optional)"""
  costCenterId: CostCenterID @iac_ref(resource: "cost_center")
  """Previous version ID for version tracking (null = first version)"""
  parentVersionId: CostRateID @iac_ref(resource: "cost_rate") @iac_computed
  """Version number within this rate series"""
  version: Int! @iac_computed
  """Whether this is the active/current version"""
  isCurrent: Boolean! @iac_computed
  """Rate amount"""
  rate: Float!
  """Currency code (e.g., 'USD', 'EUR')"""
  currency: CurrencyISO!
  """Effective start date (ISO8601)"""
  effectiveFrom: ISO8601!
  """Effective end date (ISO8601, null = no end)"""
  effectiveTo: ISO8601
  """Creation timestamp (ISO8601)"""
  createdAt: ISO8601! @iac_computed
}