Add Unique Indexes to Tables as Needed to Enforce Data Integrity Rules

The following tables need unique indexes to help enforce data integrity:

• Add unique constraint on contact_group (contact_id + group_id) (s/b only 1 join record per contact+group combination)
• Add unique index on contact_id for civicrm_individual, household, organization (s/b only 1 individual, hh or org per civicrm_contact record)
• Add unique index on location_id for civicrm_address (s/b only one address per location)
• unique contact_id in uf_match