Add complete SACC v4 infrastructure project

- Terraform modules: VPC, EC2, RDS, S3, CloudFront, Route53, Lambda, IAM, Security Groups
- Ansible playbooks for server configuration
- Scripts: create-test-environment.sh, destroy-test-environment.sh, validate-environment.sh
- Documentation: README, QUICKSTART, AGENTS
- Jenkins pipeline for automated deployment
- Jenkins pipeline for environment destruction

terraform/modules/rds/main.tf

@@ -0,0 +1,48 @@
+variable "subnet_ids" { type = list(string) }
+variable "security_group_id" {}
+variable "db_name" {}
+variable "db_username" {}
+variable "db_password" { sensitive = true }
+variable "instance_class" { default = "db.t3.micro" }
+variable "allocated_storage" { default = 20 }
+variable "environment" {}
+
+resource "aws_db_subnet_group" "main" {
+  name       = "sacc4-rds-subnet-${var.environment}"
+  subnet_ids = var.subnet_ids
+  tags       = { Name = "sacc4-rds-subnet-${var.environment}" }
+}
+
+resource "aws_db_instance" "main" {
+  identifier           = "sacc4-${var.environment}"
+  engine               = "mariadb"
+  engine_version       = "10.11.16"
+  instance_class       = var.instance_class
+  allocated_storage    = var.allocated_storage
+  storage_type         = "gp2"
+  storage_encrypted    = true
+  
+  db_name  = var.db_name
+  username = var.db_username
+  password = var.db_password
+  
+  db_subnet_group_name   = aws_db_subnet_group.main.name
+  vpc_security_group_ids = [var.security_group_id]
+  
+  publicly_accessible    = false
+  skip_final_snapshot    = true
+  backup_retention_period = 7
+  backup_window          = "00:01-00:31"
+  
+  tags = {
+    Name        = "sacc4-rds-${var.environment}"
+    Environment = var.environment
+  }
+}
+
+output "endpoint" {
+  value     = aws_db_instance.main.endpoint
+  sensitive = true
+}
+
+output "db_name" { value = aws_db_instance.main.db_name }