update frob and bite converters and repository

db/migrations/1538670026_blah.down.sql

@@ -1,11 +0,0 @@
-ALTER TABLE maker.bite
-  MODIFY ilk bytea;
-
-ALTER TABLE maker.bite
-  MODIFY urn bytea;
-
-ALTER TABLE maker.frob
-  MODIFY ilk bytea;
-
-ALTER TABLE maker.frob
-  MODIFY urn bytea;

db/migrations/1538670026_update_frob_bite_urn_ilk_type.down.sql

@@ -0,0 +1,7 @@
+ALTER TABLE maker.bite
+  ALTER COLUMN ilk SET DATA TYPE bytea,
+  ALTER COLUMN urn SET DATA TYPE bytea;
+
+ALTER TABLE maker.frob
+  ALTER COLUMN ilk SET DATA TYPE bytea,
+  ALTER COLUMN urn SET DATA TYPE bytea;