code: def delete_network_precommit(self, context):
          
          segments = context.network_segments
          for segment in segments:
              if not self.check_segment(segment):
                  return  # Not a vlan network
              vlan_id = segment.get(api.SEGMENTATION_ID)
              if not vlan_id:
                  return  # No vlan assigned to segment
  
              # For VM-FEX ports
              self.ucsm_db.delete_vlan_entry(vlan_id)
              # For Neutron virtio ports
              if any([True for ip, ucsm in CONF.ml2_cisco_ucsm.ucsms.items()
                      if ucsm.sp_template_list]):
                  # At least on UCSM has sp templates configured
                  self.ucsm_db.delete_sp_template_for_vlan(vlan_id)
  
              if any([True for ip, ucsm in CONF.ml2_cisco_ucsm.ucsms.items()
                      if ucsm.vnic_template_list]):
                  # At least one UCSM has vnic templates configured
                  self.ucsm_db.delete_vnic_template_for_vlan(vlan_id)
docs: Delete entry corresponding to Network's VLAN in the DB.