Periodic maintenance

[kgdunn]

• Update index
• backup
• check link submissions: do the links exist.Send original author of link a message after NN consecutive days of checks and ask them to update the link, or it will be removed from the site's search index.
• page views: delete page views from the same IP number within a NN minute period
• page views: remove search engines visits
• regenerate all source code _html fields
• delete unused images uploaded

[ksurya]

Need to write cron jobs for it. Improves performance & decrease resource usage