`invoice_id` int(11) default NULL, # invoice id
`comment` text, # user provided comment for time record
`billable` tinyint(4) default '0', # whether the record is billable or not
`invoice_id` int(11) default NULL, # invoice id
`comment` text, # user provided comment for time record
`billable` tinyint(4) default '0', # whether the record is billable or not