feat: Add Admin Groups Management Module

- Introduced a new module for managing user groups (`usrgrp`) in the administration interface.
- Implemented CRUD operations for user groups: list, create, rename, and delete.
- Added authorization checks to ensure only users with appropriate permissions can manage groups.
- Created corresponding frontend JavaScript and SCSS files for the new module.
- Updated documentation to reflect the new group management functionality and its authorization model.
- Added SQL stored procedures for group management operations.
- Established a new login script for database access, ensuring proper security practices.

Fuchs_DataService/FdsMfrClient.cs

@@ -16,6 +16,9 @@ public class FdsMfrClient : IDisposable
     private readonly MFRClient _mfrClient;
     private readonly ILogger<FdsMfrClient> _logger;
 
+    // Full-reset merges of large entity tables exceed SqlCommand's 30 s default.
+    private const int MergeCommandTimeoutSeconds = 600;
+
     private static MFRClientCredentials DefaultCredentials() =>
         new(FdsConfig.MFR_UserName, FdsConfig.MFR_Password);
 
@@ -257,11 +260,24 @@ public class FdsMfrClient : IDisposable
                                 {
                                     tbl.AcceptChanges();
                                     var dtwa = new DatatableWriterAsync(tbl, FdsShared.FDSConnectionString());
-                                    dtwa.CommandAfterError = new SqlCommand($"SELECT * INTO [t_{setId.ToLower()}_{tbl.TableName}] FROM {dtwa.DestinationTableName};");
+                                    // One fixed debug copy per entity table (last failed batch) instead of a new t_<setid>_ table per attempt.
+                                    string fallbackTable = $"t_err_{tbl.TableName}";
+                                    dtwa.CommandAfterError = new SqlCommand(
+                                        $"DROP TABLE IF EXISTS [{fallbackTable}]; SELECT * INTO [{fallbackTable}] FROM {dtwa.DestinationTableName};")
+                                    { CommandTimeout = MergeCommandTimeoutSeconds };
+                                    dtwa.OnCommandAfterError += (sender, caex) =>
+                                        _logger.LogError(caex,
+                                            "Update__entitytable: merge into {Table} failed ({Entity}, setid={SetId}, rows={Rows}) — staged batch kept in {FallbackTable}",
+                                            tbl.TableName, thisEntityName, setId, trc, fallbackTable);
+                                    dtwa.OnError += (sender, exc, message) =>
+                                        _logger.LogError(exc,
+                                            "Update__entitytable: DatatableWriterAsync submission failed for {Table} ({Entity}, setid={SetId}) — {Message}",
+                                            tbl.TableName, thisEntityName, setId, message);
                                     dtwa.CommandAfter = new SqlCommand(
                                         $"EXECUTE [dbo].[{tbl.TableName.Replace("__", "__updt__")}] @tblname, @referencetable, @tgtid;" +
                                         "EXECUTE [dbo].[fds__setStatus] @table,@action,@setid,@info;" +
-                                        (additionalCommandAfter ?? ""));
+                                        (additionalCommandAfter ?? ""))
+                                    { CommandTimeout = MergeCommandTimeoutSeconds };
                                     dtwa.CommandAfter.Parameters.AddRange(new SqlParameter[]
                                     {
                                         new("@tblname", dtwa.DestinationTableName),