Support ephemeral reminder confirmations

migrations/20230511125236_reminder_threads.sql

@@ -1,2 +1 @@
--- Add migration script here
 ALTER TABLE reminders ADD COLUMN `thread_id` BIGINT DEFAULT NULL;

migrations/20230511180231_ephemeral_confirmations.sql

@@ -0,0 +1 @@
+ALTER TABLE guilds ADD COLUMN ephemeral_confirmations BOOL NOT NULL DEFAULT 0;