variable "target_region_id" {
  description = "AWS region (e.g. us-east-1)."
  type        = string
  default     = "us-east-1"
}
variable "target_account_id" {
  description = "Target AWS account ID."
  type        = string
}
variable "source_account_id" {
  description = "Source AWS account ID."
  type        = string
}