[fix:] integrated refsid to data import

DataImport.cs

@@ -116,6 +116,8 @@ public class DataImport
             .Where(p => p.PropertyType == typeof(bool) && p.Name.StartsWith("has_", StringComparison.OrdinalIgnoreCase))
             .ToArray();
 
+        var last_refsid = 1000000;
+
         while (!reader.EndOfStream)
         {
             var line = reader.ReadLine();
@@ -126,10 +128,14 @@ public class DataImport
 
             var fieldValues = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
 
+            var refsid_existing = false;
+
             foreach (var hasProp in hasProperties)
             {
                 var fieldName = hasProp.Name.Substring(4);
 
+                if (fieldName == "refsid") refsid_existing = true;
+
                 var hasObj = hasProp.GetValue(patch);
                 var has = hasObj is bool b && b;
 
@@ -172,10 +178,16 @@ public class DataImport
                 return fieldValues.TryGetValue(name, out var v) ? v : "";
             }
 
+            var new_refsid = 0;
+            if (!refsid_existing)
+                new_refsid = GenerateNewRefsid();
+            else
+                new_refsid = ParseInt(GetField("refsid"));
+
             try
             {
                 var person = new KasPerson(
-                    ParseInt(GetField("refsid")),
+                    new_refsid,
                     GetField("anrede"),
                     GetField("titel"),
                     GetField("vorname"),
@@ -212,6 +224,12 @@ public class DataImport
         }
 
         return (true, imported);
+
+        int GenerateNewRefsid()
+        {
+            last_refsid++;
+            return last_refsid;
+        }
     }