refined it even moaar.

src/Squidex.Infrastructure.Azure/Storage/AzureBlobAssetStore.cs

@@ -47,16 +47,7 @@ namespace Squidex.Infrastructure.Azure.Storage
             var blobName = GetObjectName(id, version, suffix);
             var blob = blobContainer.GetBlockBlobReference(blobName);
 
-            if (await blob.ExistsAsync())
-            {
-                return;
-            }
-
-            if (!blob.Metadata.ContainsKey(AssetVersion))
-                blob.Metadata.Add(AssetVersion, version.ToString());
-            else
             blob.Metadata[AssetVersion] = version.ToString();
-
             blob.Metadata[AssetId] = id;
             
             await blob.UploadFromStreamAsync(stream);
@@ -64,9 +55,16 @@ namespace Squidex.Infrastructure.Azure.Storage
         }
 
         public void Connect()
+        {
+            try
             {
                 blobContainer = azureStorageAccount.GetContainer(containerName);
             }
+            catch (Exception)
+            {
+                throw new ConfigurationException($"Cannot connect to blob container '{containerName}'.");
+            }
+        }
 
         private string GetObjectName(string id, long version, string suffix)
         {

src/Squidex.Infrastructure.Azure/Storage/AzureStorageException.cs

@@ -1,29 +0,0 @@
-// ==========================================================================
-//  AzureStorageException.cs
-//  Squidex Headless CMS
-// ==========================================================================
-//  Copyright (c) Squidex Group
-//  All rights reserved.
-// ==========================================================================
-
-using System;
-using Microsoft.WindowsAzure.Storage;
-
-namespace Squidex.Infrastructure.Azure.Storage
-{
-    [Serializable]
-    public class AzureStorageException : StorageException
-    {
-        public AzureStorageException()
-        {
-        }
-
-        public AzureStorageException(string message) : base(message)
-        {
-        }
-
-        public AzureStorageException(string message, Exception inner) : base(message, inner)
-        {
-        }
-    }
-}

src/Squidex.Infrastructure.Azure/Storage/StorageAccountManager.cs

@@ -26,7 +26,7 @@ namespace Squidex.Infrastructure.Azure.Storage
             catch (Exception ex)
                 when (ex is FormatException || ex is ArgumentException)
             {
-                throw new AzureStorageException("Invalid storage account information provided. Please confirm the AccountName and AccountKey are valid in the app settings file.");
+                throw new ConfigurationException("Invalid storage account information provided. Please confirm the AccountName and AccountKey are valid in the app settings file.");
             }
         }
 

src/Squidex.Infrastructure.Redis/EventStore/RedisEventStore.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using Squidex.Infrastructure.CQRS.Events;
+using StackExchange.Redis;
+
+namespace Squidex.Infrastructure.Redis.EventStore
+{
+    public class RedisEventStore : IEventStore, IExternalSystem
+    {
+        private readonly Lazy<IConnectionMultiplexer> redisClient;
+
+        public RedisEventStore(Lazy<IConnectionMultiplexer> redis)
+        {
+            this.redisClient = redis;
+        }
+
+        public Task<IReadOnlyList<StoredEvent>> GetEventsAsync(string streamName)
+        {
+            var db = redisClient.Value.GetDatabase();
+
+            
+            throw new NotImplementedException();
+        }
+
+        public Task AppendEventsAsync(Guid commitId, string streamName, int expectedVersion, ICollection<EventData> events)
+        {
+            throw new NotImplementedException();
+        }
+
+        public IEventSubscription CreateSubscription(string streamFilter = null, string position = null)
+        {
+            throw new NotImplementedException();
+        }
+
+        public void Connect()
+        {
+            try
+            {
+                redisClient.Value.GetStatus();
+
+                var db = redisClient.Value.GetDatabase();
+                if (!db.HashExists("SquidexEventStore", 0))
+                {
+                    db.HashSet("SquidexEventStore", new[] { new HashEntry(0, "{event data}") });
+                }
+            }
+            catch (Exception ex)
+            {
+                throw new ConfigurationException($"Redis connection failed to connect to database {redisClient.Value.Configuration}", ex);
+            }
+        }
+    }
+}