realized that the duplicates come from saving the lineup more than once. this occurs when initially no one has an eventlineupentry, it gets one on save, but the front end is not updated on save, so it keeps creating entrires on save. simple fix is to refresh the page on save. "better" solution would be to have the front end update on save, but that's longer to implement. i started this by having `postEventLineup` return the newly fetched lineupentries.
