feat(cloud_sql): Add Cloud SQL Server PITR (#812)

* Create main.tf

Add PITR Terraform code samples for Cloud SQL for SQL Server.

* terraform fmt

* correct region tags

* ensure unique resource names

* Update main.tf

Update edition for the Enterprise sample.

* Update main.tf

Updated editions for samples.

* Update tier for enterprise plus

* revert tier change

* Add `root_password` argument

---------

Co-authored-by: Katie McLaughlin <[email protected]>

Author: rebecca-pete

cloud_sql/sqlserver_instance_pitr/main.tf

@@ -0,0 +1,59 @@
+/**
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+# [START cloud_sql_sqlserver_instance_enterprise_plus_pitr]
+# Creates a SQL SERVER Enterprise Plus edition instance. Unless specified otherwise, PITR is enabled by default.
+resource "google_sql_database_instance" "enterprise_plus" {
+  name             = "sqlserver-enterprise-plus-instance-pitr"
+  region           = "asia-northeast1"
+  database_version = "SQLSERVER_2019_ENTERPRISE"
+  root_password    = "INSERT-PASSWORD-HERE"
+  settings {
+    tier    = "db-perf-optimized-N-2"
+    edition = "ENTERPRISE_PLUS"
+    backup_configuration {
+      enabled = true
+    }
+  }
+  # Setting the `deletion_protection` flag to true ensures you can't accidentally delete the instance
+  # using Terraform. Setting the `deletion_protection_enabled` flag to true protects the instance at the
+  # Google Cloud level.
+  deletion_protection = false
+}
+# [END cloud_sql_sqlserver_instance_enterprise_plus_pitr]
+
+# [START cloud_sql_sqlserver_instance_enterprise_pitr]
+# Creates a SQL SERVER Enterprise edition instance with PITR enabled. Unless specified otherwise,
+# PITR is disabled by default.
+resource "google_sql_database_instance" "enterprise" {
+  name             = "sqlserver-enterprise-instance-pitr"
+  region           = "asia-northeast1"
+  database_version = "SQLSERVER_2019_ENTERPRISE"
+  root_password    = "INSERT-PASSWORD-HERE"
+  settings {
+    tier    = "db-custom-4-26624"
+    edition = "ENTERPRISE"
+    backup_configuration {
+      enabled                        = true
+      point_in_time_recovery_enabled = true
+    }
+  }
+  # Setting the `deletion_protection` flag to true ensures you can't accidentally delete the instance
+  # using Terraform. Setting the `deletion_protection_enabled` flag to true protects the instance at the
+  # Google Cloud level.
+  deletion_protection = false
+}
+# [END cloud_sql_sqlserver_instance_enterprise_pitr]