diff --git a/docker-compose.yml b/docker-compose.yml
index 0e44769..e05ec92 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -30,7 +30,7 @@ services:
       - EnableHttpsRedirect=false
       - TenantSettings__BaseDomain=timetracker.marc-wieland.de
     volumes:
-      - dpkeys:/root/.aspnet/DataProtection-Keys
+      - dpkeys:/home/app/.aspnet/DataProtection-Keys
     depends_on:
       - db
 
diff --git a/timetracker.Server/Program.cs b/timetracker.Server/Program.cs
index e3c82c6..5ad3903 100644
--- a/timetracker.Server/Program.cs
+++ b/timetracker.Server/Program.cs
@@ -227,10 +227,54 @@ using (var scope = app.Services.CreateScope())
                     }
                 }
             }
+
+            // Check if column IsApproved in Tenants table is of type integer
+            using (var cmdCheckApproved = conn.CreateCommand())
+            {
+                cmdCheckApproved.CommandText = @"
+                    SELECT data_type 
+                    FROM information_schema.columns 
+                    WHERE table_name = 'Tenants' AND column_name = 'IsApproved';";
+                var dataType = await cmdCheckApproved.ExecuteScalarAsync() as string;
+                if (dataType != null && dataType.Equals("integer", StringComparison.OrdinalIgnoreCase))
+                {
+                    // Alter the column type to boolean
+                    using (var cmdAlterApproved = conn.CreateCommand())
+                    {
+                        cmdAlterApproved.CommandText = @"
+                            ALTER TABLE ""Tenants"" 
+                            ALTER COLUMN ""IsApproved"" TYPE boolean 
+                            USING (""IsApproved"" <> 0);";
+                        await cmdAlterApproved.ExecuteNonQueryAsync();
+                    }
+                }
+            }
+
+            // Check if column CreatedAt in Tenants table is of type text or character varying
+            using (var cmdCheckCreatedAt = conn.CreateCommand())
+            {
+                cmdCheckCreatedAt.CommandText = @"
+                    SELECT data_type 
+                    FROM information_schema.columns 
+                    WHERE table_name = 'Tenants' AND column_name = 'CreatedAt';";
+                var dataType = await cmdCheckCreatedAt.ExecuteScalarAsync() as string;
+                if (dataType != null && (dataType.Equals("text", StringComparison.OrdinalIgnoreCase) || dataType.Equals("character varying", StringComparison.OrdinalIgnoreCase)))
+                {
+                    // Alter the column type to timestamp without time zone
+                    using (var cmdAlterCreatedAt = conn.CreateCommand())
+                    {
+                        cmdAlterCreatedAt.CommandText = @"
+                            ALTER TABLE ""Tenants"" 
+                            ALTER COLUMN ""CreatedAt"" TYPE timestamp without time zone 
+                            USING (""CreatedAt""::timestamp without time zone);";
+                        await cmdAlterCreatedAt.ExecuteNonQueryAsync();
+                    }
+                }
+            }
         }
         catch (Exception ex)
         {
-            Console.WriteLine($"Fehler beim Konvertieren der IsTenantAdmin-Spalte in PostgreSQL: {ex.Message}");
+            Console.WriteLine($"Fehler beim Konvertieren der PostgreSQL-Spaltentypen (IsTenantAdmin/IsApproved/CreatedAt): {ex.Message}");
         }
     }
 }