Add support for performance insights retention period (#147)

* Add var.performance_insights_retention_period

* Add performance insights retention docs

README.md

@@ -182,6 +182,7 @@ module "db" {
 | parameters | A list of DB parameters (map) to apply | list(map(string)) | `[]` | no |
 | password | Password for the master DB user. Note that this may show up in logs, and it will be stored in the state file | string | n/a | yes |
 | performance\_insights\_enabled | Specifies whether Performance Insights are enabled | bool | `"false"` | no |
+| performance\_insights\_retention\_period | The amount of time in days to retain Performance Insights data. Either 7 (7 days) or 731 (2 years). | number | `7` | no |
 | port | The port on which the DB accepts connections | string | n/a | yes |
 | publicly\_accessible | Bool to control if instance is publicly accessible | bool | `"false"` | no |
 | replicate\_source\_db | Specifies that this resource is a Replicate database, and to use this value as the source database. This correlates to the identifier of another Amazon RDS Database to replicate. | string | `""` | no |

main.tf

@@ -94,6 +94,7 @@ module "db_instance" {
   final_snapshot_identifier   = var.final_snapshot_identifier
 
   performance_insights_enabled          = var.performance_insights_enabled
+  performance_insights_retention_period = var.performance_insights_retention_period
 
   backup_retention_period = var.backup_retention_period
   backup_window           = var.backup_window

modules/db_instance/main.tf

@@ -82,6 +82,7 @@ resource "aws_db_instance" "this" {
   max_allocated_storage       = var.max_allocated_storage
 
   performance_insights_enabled          = var.performance_insights_enabled
+  performance_insights_retention_period = var.performance_insights_retention_period
 
   backup_retention_period = var.backup_retention_period
   backup_window           = var.backup_window
@@ -150,7 +151,9 @@ resource "aws_db_instance" "this_mssql" {
   copy_tags_to_snapshot       = var.copy_tags_to_snapshot
   final_snapshot_identifier   = var.final_snapshot_identifier
   max_allocated_storage        = var.max_allocated_storage
+
   performance_insights_enabled          = var.performance_insights_enabled
+  performance_insights_retention_period = var.performance_insights_retention_period
 
   backup_retention_period = var.backup_retention_period
   backup_window           = var.backup_window

modules/db_instance/variables.tf

@@ -262,6 +262,12 @@ variable "performance_insights_enabled" {
   default     = false
 }
 
+variable "performance_insights_retention_period" {
+  description = "The amount of time in days to retain Performance Insights data. Either 7 (7 days) or 731 (2 years)."
+  type        = number
+  default     = 7
+}
+
 variable "max_allocated_storage" {
   description = "Specifies the value for Storage Autoscaling"
   type        = number

variables.tf

@@ -331,6 +331,12 @@ variable "performance_insights_enabled" {
   default     = false
 }
 
+variable "performance_insights_retention_period" {
+  description = "The amount of time in days to retain Performance Insights data. Either 7 (7 days) or 731 (2 years)."
+  type        = number
+  default     = 7
+}
+
 variable "max_allocated_storage" {
   description = "Specifies the value for Storage Autoscaling"
   type        = number