dbtablenames does not include schema_migrations table

to stop deleting its content

database/test.go

@@ -182,7 +182,8 @@
 		if err := db.Select(&dbtablenames,
 			"SELECT tablename "+
 				"FROM pg_catalog.pg_tables "+
-				"WHERE schemaname = 'public'",
+				"WHERE schemaname = 'public' "+
+				"AND tablename <> 'schema_migrations';",
 		); err != nil {
 			t.Fatal(err)
 		}