ALTER TABLE "messages" ADD structure TEXT;
ALTER TABLE "messages" ADD UNIQUE (user_id, cache_key, uid);
-ALTER TABLE "identities" ADD html_signature integer DEFAULT 0 NOT NULL;
+ALTER TABLE "identities" ADD html_signature INTEGER;
+ALTER TABLE "identities" ALTER html_signature SET DEFAULT 0;
+UPDATE identities SET html_signature = 0;
+ALTER TABLE "identities" ALTER html_signature SET NOT NULL;