add migrations and test DB updates

Author: tomkralidis

etc/migrations/2.x-3.0/migrate.sql

@@ -4,4 +4,6 @@ alter table records add column edition TEXT;
 alter table records add column contacts TEXT;
 alter table records add column themes TEXT;
 alter table records add column illuminationelevationangle TEXT;
+alter table records alter column cloudcover type real using cast(cloudcover as float);
+alter table records alter column distancevalue type real using cast(distancevalue as float);
 vacuum;