diff --git a/OpenAlprWebhookProcessor/WebhookProcessor/GroupWebhookHandler.cs b/OpenAlprWebhookProcessor/WebhookProcessor/GroupWebhookHandler.cs
index c3a5d60e..0e1c513e 100644
--- a/OpenAlprWebhookProcessor/WebhookProcessor/GroupWebhookHandler.cs
+++ b/OpenAlprWebhookProcessor/WebhookProcessor/GroupWebhookHandler.cs
@@ -43,7 +43,6 @@ public GroupWebhookHandler(
         public async Task HandleWebhookAsync(
             Webhook webhook,
             bool isBulkImport,
-            List<string> previouslyProcessedGroups,
             CancellationToken cancellationToken)
         {
             var camera = await _processorContext.Cameras
@@ -68,41 +67,18 @@ public async Task HandleWebhookAsync(
                 return;
             }
 
-            var alreadyProcessed = false;
-
-            if (previouslyProcessedGroups != null)
-            {
-                alreadyProcessed = previouslyProcessedGroups
-                    .Intersect(webhook.Group.Uuids)
-                    .Any();
-
-                if (!alreadyProcessed)
-                {
-                    previouslyProcessedGroups.AddRange(webhook.Group.Uuids);
-                }
-            }
-            else
-            {
-                alreadyProcessed = await _processorContext.PlateGroups.Select(x => x.OpenAlprUuid)
-                    .Intersect(webhook.Group.Uuids)
-                    .AnyAsync(cancellationToken);
-            }
-
-            if (alreadyProcessed)
-            {
-                _logger.LogWarning("Duplicate group received, skipping: " + webhook.Group.BestUuid);
-                return;
-            }
-
-            var previousPreviewGroup = await _processorContext.PlateGroups
+            var previousPreviewGroups = await _processorContext.PlateGroups
                 .Where(x => webhook.Group.Uuids.Contains(x.OpenAlprUuid))
-                .FirstOrDefaultAsync(cancellationToken);
+                .ToListAsync(cancellationToken);
 
             PlateGroup plateGroup;
-            if (previousPreviewGroup != null)
+            if (previousPreviewGroups.Count > 0)
             {
-                _logger.LogInformation("Previous preview plate exists: " + previousPreviewGroup.BestNumber + ", overwriting");
-                plateGroup = previousPreviewGroup;
+                plateGroup = previousPreviewGroups[0];
+                _processorContext.PlateGroups.RemoveRange(previousPreviewGroups.Skip(1));
+
+                _logger.LogInformation("Previous preview plate exists: " + plateGroup.BestNumber + ", overwriting");
+                
             }
             else
             {
@@ -124,7 +100,7 @@ public async Task HandleWebhookAsync(
 
             MapVehicle(plateGroup, webhook);
 
-            if (previousPreviewGroup == null)
+            if (previousPreviewGroups.Count == 0)
             {
                 _processorContext.PlateGroups.Add(plateGroup);
             }
diff --git a/OpenAlprWebhookProcessor/WebhookProcessor/OpenAlprAgentScraper/OpenAlprAgentScraper.cs b/OpenAlprWebhookProcessor/WebhookProcessor/OpenAlprAgentScraper/OpenAlprAgentScraper.cs
index 5c94036b..500bd940 100644
--- a/OpenAlprWebhookProcessor/WebhookProcessor/OpenAlprAgentScraper/OpenAlprAgentScraper.cs
+++ b/OpenAlprWebhookProcessor/WebhookProcessor/OpenAlprAgentScraper/OpenAlprAgentScraper.cs
@@ -93,9 +93,6 @@ await newGroup.Content.ReadAsStreamAsync(cancellationToken),
                         continue;
                     }
 
-                    var previouslyProcessedGroups = await _processorContext.PlateGroups
-                        .Select(x => x.OpenAlprUuid)
-                        .ToListAsync(cancellationToken);
                     try
                     {
                         await _groupWebhookHandler.HandleWebhookAsync(
@@ -104,7 +101,6 @@ await _groupWebhookHandler.HandleWebhookAsync(
                                 Group = group, 
                             },
                             true,
-                            previouslyProcessedGroups,
                             cancellationToken);
                     }
                     catch
diff --git a/OpenAlprWebhookProcessor/WebhookProcessor/WebhookController.cs b/OpenAlprWebhookProcessor/WebhookProcessor/WebhookController.cs
index 09a48b31..b09f2e36 100644
--- a/OpenAlprWebhookProcessor/WebhookProcessor/WebhookController.cs
+++ b/OpenAlprWebhookProcessor/WebhookProcessor/WebhookController.cs
@@ -48,7 +48,6 @@ public async Task<ActionResult> Post(CancellationToken cancellationToken)
                     await _groupWebhookHandler.HandleWebhookAsync(
                     alertGroupResult,
                     false,
-                    null,
                     cancellationToken);
                 }
                 else if (rawWebhook.Contains("alpr_group"))
@@ -62,7 +61,6 @@ await _groupWebhookHandler.HandleWebhookAsync(
                     await _groupWebhookHandler.HandleWebhookAsync(
                         groupResult,
                         false,
-                        null,
                         cancellationToken);
                 }
                 else if (rawWebhook.Contains("alpr_results"))