Fixing dataset PI insertion with name changes.

When an individual changes their name, but has associated publications that use their prior name, Tilia attempts to post the same name twice, and associate the prior alias.  This violates the constraint that the dataset PI rows must be unique.  This change allows a conflict to fail.

Author: SimonGoring

function/ts/deletechronology.sql

@@ -15,4 +15,4 @@ AS $function$
 
   DELETE FROM ndb.chronologies AS ch
   WHERE ch.chronologyid = _chronologyid;
-$function$
+$function$;

function/ts/insertdatasetpi.sql

@@ -4,4 +4,5 @@ CREATE OR REPLACE FUNCTION ts.insertdatasetpi(_datasetid integer, _contactid int
 AS $function$
 INSERT INTO ndb.datasetpis(datasetid, contactid, piorder)
 VALUES (_datasetid, _contactid, _piorder)
+ON CONFLICT (datasetid, contactid) DO NOTHING;
 $function$