Add MirroringSafetyLevel enum and update SqlDatabase to use it for MirroringSafetyLevel property

Author: johlju

source/Classes/020.SqlDatabase.ps1

@@ -630,8 +630,7 @@ class SqlDatabase : SqlResourceBase
     $LegacyCardinalityEstimationForSecondary
 
     [DscProperty()]
-    [ValidateSet('Off', 'Full', 'Unknown')]
-    [System.String]
+    [MirroringSafetyLevel]
     $MirroringSafetyLevel
 
     [DscProperty()]
@@ -856,14 +855,16 @@ class SqlDatabase : SqlResourceBase
             # RetentionPeriodUnits enum (convert SMO enum to module enum)
             $currentState.ChangeTrackingRetentionPeriodUnits = [RetentionPeriodUnits] $databaseObject.ChangeTrackingRetentionPeriodUnits.ToString()
 
+            # MirroringSafetyLevel enum (convert SMO enum to module enum)
+            $currentState.MirroringSafetyLevel = [MirroringSafetyLevel] $databaseObject.MirroringSafetyLevel.ToString()
+
             # Enum properties (convert to string with null check)
             $enumProperties = @(
                 'ContainmentType'
                 'DelayedDurability'
                 'FilestreamNonTransactedAccess'
                 'LegacyCardinalityEstimation'
                 'LegacyCardinalityEstimationForSecondary'
-                'MirroringSafetyLevel'
                 'PageVerify'
                 'ParameterSniffing'
                 'ParameterSniffingForSecondary'

source/Enum/001.MirroringSafetyLevel.ps1

@@ -0,0 +1,16 @@
+<#
+    .SYNOPSIS
+        Enum for database mirroring safety level.
+
+    .DESCRIPTION
+        This enum represents the mirroring safety level for a database.
+        The value None (0) indicates that mirroring is not configured for the
+        database.
+#>
+enum MirroringSafetyLevel
+{
+    None    = 0
+    Unknown = 1
+    Off     = 2
+    Full    = 3
+}