Added required attributes to postgres and redis

WHY: There is a required minimum standard setting for prod postgres and redis
HOW: By setting HA, Maintenance window and SKU

terraform/aks/databases.tf

@@ -16,6 +16,10 @@ module "postgres" {
   server_version          = "14"
 
   azure_enable_backup_storage = var.azure_enable_backup_storage
+
+  azure_sku_name          = var.postgres_flexible_server_sku
+  azure_enable_high_availability = var.postgres_enable_high_availability
+  azure_maintenance_window       = var.azure_maintenance_window
 }
 
 module "redis" {
@@ -34,4 +38,5 @@ module "redis" {
   use_azure               = var.deploy_azure_backing_services
   azure_enable_monitoring = var.enable_monitoring
   azure_patch_schedule    = [{ "day_of_week" : "Sunday", "start_hour_utc" : 01 }]
+  azure_maxmemory_policy    = "noeviction"
 }

terraform/aks/variables.tf

@@ -45,6 +45,15 @@ variable "enable_monitoring" {
   default     = false
   description = "Enable monitoring and alerting"
 }
+variable "postgres_enable_high_availability" { 
+  default = false 
+}
+variable "postgres_flexible_server_sku" { 
+  default = "B_Standard_B1ms" 
+}
+variable "azure_maintenance_window" { 
+  default = null 
+}
 
 variable "enable_postgres_ssl" {
   default     = true

terraform/aks/workspace_variables/production.tfvars.json

@@ -8,6 +8,13 @@
   "config_short": "pd",
   "service_short": "faltrn",
   "app_key_vault": "s189p01-faltrn-pd-app-kv",
+  "postgres_flexible_server_sku": "GP_Standard_D2ds_v4",
+  "postgres_enable_high_availability": true,
+  "azure_maintenance_window": {
+    "day_of_week": 0,
+    "start_hour": 3,
+    "start_minute": 0
+  },
   "statuscake_alerts": {
     "alert": {
       "website_url": [