Test strange IDs and minor fix to handle APP ID.

backend/src/Squidex.Domain.Apps.Entities.MongoDb/ShardedSnapshotStore.cs

@@ -91,7 +91,7 @@ private static DomainId GetAppId(DomainId key)
         // This is a leaky abstraction, but the only option to implement that in a fast way.
         var parts = key.ToString().Split(DomainId.IdSeparator);
 
-        if (parts.Length != 2)
+        if (parts.Length < 2)
         {
             throw new InvalidOperationException("The key does not contain an app id.");
         }

tools/TestSuite/TestSuite.ApiTests/ContentUpdateTests.cs

@@ -330,6 +330,28 @@ public async Task Should_create_content_with_custom_id_and_upsert()
         Assert.Equal(3, content.Data.Number);
     }
 
+    [Theory]
+    [InlineData("e5f7c399-6024-4367-9538-b7de4bced0f9' UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL-- vIGQ")]
+    [InlineData("e5f7c399-6024-4367-9538-b7de4bced0f9') UNION ALL SELECT 59,59,59,'qkjvq'||'FWUHnOHbQqCmewsQoKRPxqUXmHZMTtqHmyYoRhwu'||'qvpkq',59-- dLuxn")]
+    public async Task Should_create_and_delete_content_with_strange_id(string id)
+    {
+        // STEP 1: Upsert a new item with a custom id.
+        var content_0 = await _.Contents.UpsertAsync(id, new TestEntityData(), ContentUpsertOptions.AsPublish);
+
+        Assert.Equal(id, content_0.Id);
+
+        // STEP 2: Find content
+        var content_1 = await _.Contents.GetAsync(id);
+
+        Assert.Equal(id, content_1.Id);
+
+
+        // STEP 3: Delete content.
+        await _.Contents.DeleteAsync(id);
+
+        await Assert.ThrowsAnyAsync<SquidexException>(() => _.Contents.GetAsync(id));
+    }
+
     [Theory]
     [InlineData(ContentStrategies.Update.Normal)]
     [InlineData(ContentStrategies.Update.Upsert)]