Cron initiation fails at config.ini read

> ConfigParser.NoSectionError: No section: 'main'

I have had to place the path for the config.ini file in the crontab PATH, or hard code into the function reference for config.ini in datastore_updater.py

Inspect datastore_updater.py and config.ini to trace how the configuration path is resolved when the script runs from cron. Reproduce the NoSectionError in the cron environment and compare it with an interactive run. Done means cron can locate config.ini and read the main section without adding the path to crontab or hard-coding it.

Written by the indexing model from the issue text.