fixup! chg: generate, cleanup: Use 28 days of measurements

docs/source/man_sbws.ini.rst

@@ -145,7 +145,7 @@ cleanup
   data_files_compress_after_days = INT
     After this many days, compress data files. (Default: 29)
   data_files_delete_after_days = INT
-    After this many days, delete data files. (Default: 56)
+    After this many days, delete data files. (Default: 57)
   v3bw_files_compress_after_days = INT
     After this many days, compress v3bw files. (Default: 1)
   v3bw_files_delete_after_days = INT