bgpwtf/cccampix: draw the rest of the fucking owl

Change-Id: I49fd5906e69512e8f2d414f406edc0179522f225
diff --git a/bgpwtf/cccampix/verifier/model/migrations/1565545845_allowed_prefixes.down.sql b/bgpwtf/cccampix/verifier/model/migrations/1565545845_allowed_prefixes.down.sql
new file mode 100644
index 0000000..d0a98f3
--- /dev/null
+++ b/bgpwtf/cccampix/verifier/model/migrations/1565545845_allowed_prefixes.down.sql
@@ -0,0 +1 @@
+DROP TABLE allowed_prefix;