fix: expire group cache after 5 minutes

Author: JohnDuprey

Modules/CIPPCore/Public/TenantGroups/Get-TenantGroups.ps1

@@ -12,6 +12,8 @@ if (-not $script:TenantGroupsResultCache) {
     $script:TenantGroupsResultCache = @{}
 }
 
+$script:TenantGroupsCacheTTL = (New-TimeSpan -Minutes 5)
+
 function Get-TenantGroups {
     <#
     .SYNOPSIS
@@ -49,8 +51,9 @@ function Get-TenantGroups {
         }
     }
 
-    # Load table data into cache if not already loaded
-    if (-not $script:TenantGroupsCache.Groups -or -not $script:TenantGroupsCache.Members -or $SkipCache) {
+    # Load table data into cache if not already loaded or expired
+    $CacheExpired = $script:TenantGroupsCache.LastRefresh -and ((Get-Date) - $script:TenantGroupsCache.LastRefresh) -gt $script:TenantGroupsCacheTTL
+    if (-not $script:TenantGroupsCache.Groups -or -not $script:TenantGroupsCache.Members -or $SkipCache -or $CacheExpired) {
         Write-Verbose 'Loading TenantGroups and TenantGroupMembers tables into cache'
 
         $GroupTable = Get-CippTable -tablename 'TenantGroups'
@@ -62,6 +65,7 @@ function Get-TenantGroups {
         $script:TenantGroupsCache.Groups = @(Get-CIPPAzDataTableEntity @GroupTable)
         $script:TenantGroupsCache.Members = @(Get-CIPPAzDataTableEntity @MembersTable)
         $script:TenantGroupsCache.LastRefresh = Get-Date
+        $script:TenantGroupsResultCache = @{}
 
         # Build MembersByGroup index: GroupId -> array of member objects
         $script:TenantGroupsCache.MembersByGroup = @{}