Index: SQL/mysql/schema_7_up.sql
===================================================================
--- SQL/mysql/schema_7_up.sql	(revision 0)
+++ SQL/mysql/schema_7_up.sql	(revision 0)
@@ -0,0 +1,3 @@
+ALTER TABLE tracks_persistent modify column url text character set utf8 collate utf8_unicode_ci NOT NULL;
+ALTER TABLE tracks_persistent modify column musicbrainz_id varchar(40) character set utf8 collate utf8_unicode_ci;
+
Index: SQL/mysql/schema_7_down.sql
===================================================================
--- SQL/mysql/schema_7_down.sql	(revision 0)
+++ SQL/mysql/schema_7_down.sql	(revision 0)
@@ -0,0 +1,3 @@
+ALTER TABLE tracks_persistent modify column url text character set utf8 collate utf8_general_ci NOT NULL;
+ALTER TABLE tracks_persistent modify column musicbrainz_id varchar(40) character set utf8 collate utf8_general_ci;
+