fix extension function by getting the last item of a split

Signed-off-by: Bariq <[email protected]>

Author: bariqhibat

src/test/db/02-storage-schema.sql

@@ -71,7 +71,7 @@ BEGIN
 	select string_to_array(name, '/') into _parts;
 	select _parts[array_length(_parts,1)] into _filename;
 	-- @todo return the last part instead of 2
-	return split_part(_filename, '.', 2);
+	return reverse(split_part(reverse(_filename), '.', 1));
 END
 $function$;