"Cannot change column 'ipsec_site_conn_id': used in a foreign key constraint 'cisco_csr_identifier_map_ibfk_1'") [SQL: u'ALTER TABLE cisco_csr_identifier_map MODIFY ipsec_site_conn_id VARCHAR(36) NULL']
The upgrade sql can’t run because of a relation.
Remove the relationship on the ipsec_site_conn_id column. Reduce the varchar from 64 to 32. Re-create the relationship.