add final snapshot identifier

main.tf

@@ -2,6 +2,7 @@
 # Variables
 #############################################################################################################
 variable "vpc_id" {}
+
 variable "security_groups" {
   type = "list"
 }
@@ -118,11 +119,10 @@ resource "aws_db_instance" "default" {
   db_subnet_group_name   = "${aws_db_subnet_group.default.name}"
 
   parameter_group_name      = "${var.parameter_group}"
-
+  final_snapshot_identifier = "final-snapshot-terraform"
   backup_retention_period   = "${var.backup_retention_period}"
   backup_window             = "${var.backup_window}"
   maintenance_window        = "${var.maintenance_window}"
-
 }
 
 resource "aws_db_instance" "read_replica" {