aws_db_instance final_snapshot_identifier

db.tf

resource "aws_db_instance" "api" {
    identifier = "api-${var.stack}"
    allocated_storage = 100
    engine = "postgres"
    engine_version = "9.3.6"
    instance_class = "db.m3.medium"
    storage_encrypted = true
    apply_immediately = false
    name = "${var.db_name}"
    username = "${var.db_master_username}"
    password = "${var.db_master_password}"
    backup_retention_period = 14
    backup_window = "00:00-00:30"
    maintenance_window = "sun:01:00-sun:01:30"
    publicly_accessible = false
    multi_az = true
    vpc_security_group_ids = [
        "${aws_security_group.default.id}",
        "${aws_security_group.rds_api.id}"
    ]
    db_subnet_group_name = "private-${var.stack}"
    storage_type = "io1"
    iops = 1000
    final_snapshot_identifier = "final-api-${var.stack}-${aws_security_group.rds_api.id}"

    tags {
        Name = "api.${var.stack}.${var.domain}"
        Stack = "${var.stack}"
    }
}