Uninstallation

When the plugin is deleted from the WP admin (not just deactivated), the uninstall hook runs:

1. Drops wp_oads_impressions
2. Drops wp_oads_clicks
3. Drops wp_oads_zones
4. Drops wp_oads_groups
5. Deletes oads_settings option
6. Deletes oads_group_rr_pointers option
7. Permanently deletes all oads_ad posts and their meta

This is irreversible. Export your analytics CSVs before uninstalling if you need historical data.