Replace go-migrate with morph (#19116)

db/migrations/postgres/000012_create_commands.down.sql

@@ -0,0 +1,8 @@
+DROP INDEX IF EXISTS idx_commands_team_id;
+DROP INDEX IF EXISTS idx_commands_update_at;
+DROP INDEX IF EXISTS idx_commands_create_at;
+DROP INDEX IF EXISTS idx_commands_delete_at;
+
+ALTER TABLE commands DROP COLUMN IF EXISTS pluginid;
+
+DROP TABLE IF EXISTS commands;