Add postgres config (#7)

### TL;DR
Adds RDS Aurora PostgreSQL database configuration and connects it to
xmtpd services.

### What changed?
- Added RDS Aurora PostgreSQL 16 cluster configuration with 2 instances
- Updated module sources to reference GitHub repository paths
- Connected database URL to xmtpd-api and xmtpd-worker services
- Configured security groups for database access within VPC
- Set up database parameter groups and subnet groups
- Implemented password generation for database access

.tflint.hcl

@@ -12,4 +12,4 @@ rule "terraform_required_providers" {
 
 rule "terraform_required_version" {
   enabled = false
-}
+}

terraform/examples/aws-complete/main.tf

@@ -1,6 +1,7 @@
 
 module "mls_validation_service" {
-  source     = "./aws/xmtp-validation-service" # TODO: Replace with git URL once merged to main
+  # tflint-ignore: terraform_module_pinned_source
+  source     = "github.com/xmtp/xmtpd-infrastructure//terraform/aws/xmtp-validation-service"
   depends_on = [module.vpc, aws_service_discovery_private_dns_namespace.xmtp]
 
   env                              = terraform.workspace
@@ -18,7 +19,8 @@ module "mls_validation_service" {
 }
 
 module "xmtpd_api" {
-  source = "./aws/xmtpd-api" # TODO: Replace with git URL once merged to main
+  # tflint-ignore: terraform_module_pinned_source
+  source = "github.com/xmtp/xmtpd-infrastructure//terraform/aws/xmtpd-api"
 
   vpc_id          = module.vpc.vpc_id
   public_subnets  = module.vpc.public_subnets
@@ -36,7 +38,7 @@ module "xmtpd_api" {
   service_secrets = {
     signer_private_key = var.signer_private_key
     chain_rpc_url      = var.chain_rpc_url
-    database_url       = "CHANGE_ME" # TODO:nm add database
+    database_url       = "postgres://${aws_rds_cluster.cluster.master_username}:${aws_rds_cluster.cluster.master_password}@${aws_rds_cluster.cluster.endpoint}:5432/${aws_rds_cluster.cluster.database_name}?sslmode=disable"
   }
   enable_debug_logs = false
 
@@ -46,7 +48,8 @@ module "xmtpd_api" {
 }
 
 module "xmtpd_worker" {
-  source = "./aws/xmtpd-worker" # TODO: Replace with git URL once merged to main
+  # tflint-ignore: terraform_module_pinned_source
+  source = "github.com/xmtp/xmtpd-infrastructure//terraform/aws/xmtpd-worker"
 
   vpc_id         = module.vpc.vpc_id
   public_subnets = module.vpc.public_subnets
@@ -62,7 +65,7 @@ module "xmtpd_worker" {
   service_secrets = {
     signer_private_key = var.signer_private_key
     chain_rpc_url      = var.chain_rpc_url
-    database_url       = "CHANGE_ME" # TODO:nm add database
+    database_url       = "postgres://${aws_rds_cluster.cluster.master_username}:${aws_rds_cluster.cluster.master_password}@${aws_rds_cluster.cluster.endpoint}:5432/${aws_rds_cluster.cluster.database_name}?sslmode=disable"
   }
   enable_debug_logs = false
 

terraform/examples/aws-complete/rds.tf

@@ -0,0 +1,86 @@
+locals {
+  db_engine_version            = "16"
+  db_name                      = "xmtp"
+  db_root_user                 = "xmtp"
+  is_production_environment    = false
+  db_num_instances             = 2
+  db_instance_class            = "db.t4g.medium"
+  db_ca_certificate_identifier = "rds-ca-rsa2048-g1"
+  db_parameter_group_family    = "aurora-postgresql16"
+}
+
+resource "random_password" "password" {
+  length  = 64
+  special = false
+}
+
+resource "aws_rds_cluster" "cluster" {
+  engine                          = "aurora-postgresql"
+  engine_version                  = local.db_engine_version
+  availability_zones              = module.vpc.azs
+  database_name                   = local.db_name
+  master_username                 = local.db_root_user
+  master_password                 = random_password.password.result
+  db_cluster_parameter_group_name = aws_rds_cluster_parameter_group.default.name
+  db_subnet_group_name            = aws_db_subnet_group.cluster.name
+  vpc_security_group_ids          = [aws_security_group.rds.id]
+  deletion_protection             = local.is_production_environment
+  apply_immediately               = true
+  # These will need to be turned off for production usage
+  backup_retention_period = local.is_production_environment ? 30 : 1
+  skip_final_snapshot     = local.is_production_environment ? false : true
+
+  lifecycle {
+    ignore_changes = [
+      availability_zones
+    ]
+  }
+}
+
+resource "aws_rds_cluster_instance" "instances" {
+  count = local.db_num_instances
+
+  cluster_identifier           = aws_rds_cluster.cluster.id
+  instance_class               = local.db_instance_class
+  engine                       = aws_rds_cluster.cluster.engine
+  engine_version               = aws_rds_cluster.cluster.engine_version
+  auto_minor_version_upgrade   = false
+  ca_cert_identifier           = local.db_ca_certificate_identifier
+  publicly_accessible          = false
+  performance_insights_enabled = true
+  db_subnet_group_name         = aws_db_subnet_group.cluster.name
+  apply_immediately            = true
+}
+
+resource "aws_db_subnet_group" "cluster" {
+  subnet_ids = module.vpc.private_subnets
+}
+
+# Create a parameter group so that we can adjust parameters later without recreating the cluster
+resource "aws_rds_cluster_parameter_group" "default" {
+  family      = local.db_parameter_group_family
+  description = "RDS cluster parameter group"
+
+  parameter {
+    name = "log_temp_files"
+    # Log any temp files greater than 1MB
+    value        = "1000"
+    apply_method = "pending-reboot"
+  }
+}
+
+
+resource "aws_security_group" "rds" {
+  description = "RDS security group"
+  vpc_id      = module.vpc.vpc_id
+}
+
+resource "aws_security_group_rule" "ingress" {
+  description       = "Allow Postgres traffic from our VPC"
+  cidr_blocks       = [module.vpc.vpc_cidr_block]
+  from_port         = 5432
+  protocol          = "tcp"
+  security_group_id = aws_security_group.rds.id
+  to_port           = 5432
+  type              = "ingress"
+}