add reserved_concurrent_executions to template lambda terraform

infrastructure/terraform/lambda/_template/main.tf

@@ -36,6 +36,8 @@ module "lambda" {
   # Optional: Set maximum_concurrency to limit concurrent SQS-triggered invocations (2-1000)
   maximum_concurrency = var.maximum_concurrency
 
+  reserved_concurrent_executions = var.reserved_concurrent_executions
+
   batch_size = var.batch_size
 
   environment = {

infrastructure/terraform/lambda/_template/variables.tf

@@ -23,6 +23,12 @@ variable "maximum_concurrency" {
   description = "Maximum number of concurrent Lambda invocations from SQS (2-1000). null = no limit."
 }
 
+variable "reserved_concurrent_executions" {
+  type        = number
+  default     = -1
+  description = "Reserved concurrency for the Lambda function. -1 = unreserved. 1+ = hard limit across all triggers."
+}
+
 variable "batch_size" {
   type    = number
   default = 1