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inspiration/Ablera.Serdica.Authentication/Utilities/RedisAndFileSystemXmlRepository.cs

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+using Microsoft.AspNetCore.DataProtection.Repositories;
+using StackExchange.Redis;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Linq;
+
+namespace Ablera.Serdica.Authentication.Utilities;
+
+// Move this to ...Authentication.Redis or something
+public sealed class RedisAndFileSystemXmlRepository : IXmlRepository
+{
+    private readonly IDatabase _db;
+    private readonly string _prefix;
+
+    public RedisAndFileSystemXmlRepository(IDatabase db, string prefix)
+    {
+        _db = db;
+        _prefix = prefix;
+    }
+
+    public IReadOnlyCollection<XElement> GetAllElements()
+    {
+        var keys = _db.SetMembers(_prefix);
+        var list = new List<XElement>();
+
+        foreach (var redisValue in keys)
+        {
+            var xml = redisValue.ToString();
+            try { list.Add(XElement.Parse(xml)); }
+            catch { /* ignore corrupted entry */ }
+        }
+        return list;
+    }
+
+    public void StoreElement(XElement element, string friendlyName)
+    {
+        var xml = element.ToString(SaveOptions.DisableFormatting);
+
+        /* 1) write to Redis (set-add = idempotent) */
+        _db.SetAdd(_prefix, xml);
+    }
+}
+