diff --git a/Cli/CustomTasks.cs b/Cli/CustomTasks.cs
index ba12582..8de19e9 100644
--- a/Cli/CustomTasks.cs
+++ b/Cli/CustomTasks.cs
@@ -159,6 +159,105 @@ namespace FsToolbox.Cli
 
         #endregion
 
+        #region Public Method AnalyzeEarlySlotRegistrationsAsync
+
+        /// <summary>
+        ///     Identifies store log entries where a user registered earlier than the automatic slot creation interval.
+        /// </summary>
+        /// <param name="httpClient">The HTTP client used to perform the requests.</param>
+        public static async Task AnalyzeEarlySlotRegistrationsAsync(HttpClient httpClient)
+        {
+            await AuthHelper.EnsureAuthenticationAsync(httpClient);
+
+            const int regionId = 139;
+            var stores = await RegionTasks.GetStoresInRegionAsync(httpClient, regionId);
+            var cooperatingStores = stores.Where(x => x.CooperationStatus == RegionTasks.CooperationStatus.Cooperating).ToList();
+
+            if (cooperatingStores.Count == 0)
+            {
+                Logger.Info("No cooperating stores found in region {RegionId}.", regionId);
+                return;
+            }
+
+            var fromDate = DateTime.Today.AddMonths(-6).ToString("yyyy-MM-dd");
+            var toDate = DateTime.Today.ToString("yyyy-MM-dd");
+            const string storeLogActionIds = "11";
+
+            var ignoredStoreIds = new HashSet<int> { 51224, 61913 };
+            var storesToProcess = cooperatingStores
+                .Where(x => !ignoredStoreIds.Contains(x.Id))
+                .ToList();
+            Logger.Info("Debug mode: processing first {Count} cooperating stores.", storesToProcess.Count);
+
+            var analyzed = new List<StoreLogIntervalEntry>();
+
+            foreach (var store in storesToProcess)
+            {
+                var info = await StoreTasks.GetStoreInformationAsync(httpClient, store.Id);
+                if (info == null)
+                {
+                    Logger.Info("Store information not available for {StoreId}.", store.Id);
+                    continue;
+                }
+
+                var calendarInterval = info.CalendarInterval;
+                if (calendarInterval <= 0)
+                {
+                    Logger.Info("Skipping {StoreName} because calendar interval is {Interval}.", store.Name, calendarInterval);
+                    continue;
+                }
+                Logger.Info("Calendar interval for {StoreName} is {Interval} seconds.", store.Name, calendarInterval);
+
+                var logEntries = await StoreTasks.GetStoreLogEntriesAsync(httpClient, store.Id, fromDate, toDate, storeLogActionIds);
+                Thread.Sleep(1000);
+
+                foreach (var entry in logEntries)
+                {
+                    if (entry.DateReference == null) continue;
+
+                    var secondsDifference = (entry.DateReference.Value - entry.PerformedAt).TotalSeconds;
+                    if (secondsDifference <= calendarInterval) continue;
+
+                    analyzed.Add(new StoreLogIntervalEntry(store, entry, secondsDifference, calendarInterval, true));
+                }
+            }
+
+            var exceeding = analyzed.Count;
+
+            var sb = new StringBuilder();
+            sb.AppendLine("Early Slot Registration Report");
+            sb.AppendLine("Generated: " + DateTime.Now.ToString("dd.MM.yyyy HH:mm"));
+            sb.AppendLine($"Region: {regionId}");
+            sb.AppendLine($"Stores analyzed: {storesToProcess.Count}");
+            sb.AppendLine($"Timeframe: {fromDate} to {toDate}");
+            sb.AppendLine($"Total log entries: {analyzed.Count}");
+            sb.AppendLine($"Exceeding interval: {exceeding}");
+            sb.AppendLine("============================");
+            sb.AppendLine();
+
+            foreach (var entry in analyzed.OrderByDescending(x => x.SecondsDifference))
+            {
+                var foodsaver = entry.Entry.ActingFoodsaver;
+                var foodsaverName = foodsaver?.Name ?? "(unknown)";
+                var foodsaverId = foodsaver?.Id.ToString() ?? "n/a";
+                var reference = entry.Entry.DateReference?.ToString("dd.MM.yyyy - HH:mm") ?? "n/a";
+                var performed = entry.Entry.PerformedAt.ToString("dd.MM.yyyy - HH:mm");
+                var intervalWeeks = entry.CalendarIntervalSeconds / (60.0 * 60 * 24 * 7);
+                var earlySeconds = entry.SecondsDifference - entry.CalendarIntervalSeconds;
+                var earlySpan = TimeSpan.FromSeconds(earlySeconds);
+
+                sb.AppendLine($"- {foodsaverName} ({foodsaverId}) | Store: {entry.Store.Name} ({entry.Store.Id}) | Performed: {performed} | Slot Date: {reference} | Interval: {intervalWeeks:F2} weeks | Early: {earlySpan.Days}d {earlySpan.Hours}h {earlySpan.Minutes}m");
+            }
+
+            var timestamp = DateTime.Now.ToString("yyyyMMdd_HHmmss");
+            var filename = $"EarlySlotRegistrations_{timestamp}.txt";
+            await File.WriteAllTextAsync(filename, sb.ToString());
+
+            Logger.Info("Report saved: {FileName}", filename);
+        }
+
+        #endregion
+
         #region Public Method ConfirmUnconfirmedPickupsLindenbergAsync
 
         /// <summary>
diff --git a/Cli/Program.cs b/Cli/Program.cs
index c5f32cd..71f42f2 100644
--- a/Cli/Program.cs
+++ b/Cli/Program.cs
@@ -19,6 +19,7 @@ logger.Info("Choose a task to execute:");
 logger.Info("1. Check Aldi Memberships");
 logger.Info("2. Confirm all Unconfirmed Pickups for Lindenberg");
 logger.Info("3. Analyze slot unregistrations for region Siegen");
+logger.Info("4. Analyze early slot registrations (calendar interval)");
 logger.Info("Enter the number of the task to execute (or any other key to exit): ");
 var choice = Console.ReadLine();   
 
@@ -33,6 +34,9 @@ switch (choice)
     case "3":
         await CustomTasks.AnalyzeSlotUnregistrationsAsync(httpClient);
         break;
+    case "4":
+        await CustomTasks.AnalyzeEarlySlotRegistrationsAsync(httpClient);
+        break;
     default:
         logger.Info("Exiting...");
         break;
diff --git a/Cli/Tasks/StoreTasks.cs b/Cli/Tasks/StoreTasks.cs
index 17d6c5f..2c976cc 100644
--- a/Cli/Tasks/StoreTasks.cs
+++ b/Cli/Tasks/StoreTasks.cs
@@ -82,6 +82,47 @@ namespace FsToolbox.Cli.Tasks
 
         #endregion
 
+        #region Public Method GetStoreInformationAsync
+
+        /// <summary>
+        ///     Retrieves store information including the calendar interval.
+        /// </summary>
+        /// <param name="httpClient">The HTTP client used to send the request.</param>
+        /// <param name="storeId">The store identifier to query.</param>
+        /// <returns>The store information, or null when the call fails.</returns>
+        public static async Task<StoreInformation?> GetStoreInformationAsync(HttpClient httpClient, int storeId)
+        {
+            await AuthHelper.EnsureAuthenticationAsync(httpClient);
+
+            var uri = string.Format(Endpoints.StoreInformation, storeId);
+            var response = await httpClient.GetAsync(uri);
+            var responseBody = await response.Content.ReadAsStringAsync();
+
+            if (!response.IsSuccessStatusCode)
+            {
+                Logger.Error("Store information retrieval failed ({Status} {Reason}): {Body}", (int)response.StatusCode, response.ReasonPhrase, responseBody);
+                return null;
+            }
+
+            var opts = new JsonSerializerOptions
+            {
+                PropertyNameCaseInsensitive = true,
+                PropertyNamingPolicy = null
+            };
+
+            try
+            {
+                return JsonSerializer.Deserialize<StoreInformation>(responseBody, opts);
+            }
+            catch (JsonException ex)
+            {
+                Logger.Error(ex, "Failed to parse store information response.");
+                return null;
+            }
+        }
+
+        #endregion
+
         #region Public Method GetStoreLogAsync
 
         /// <summary>