Add migration 0016 to fix missing sendReminderAt column.

0015 was already marked applied with the wrong column name, so redeploys
skipped it; 0016 drops send_reminder_at and adds sendReminderAt.

Co-authored-by: Cursor <cursoragent@cursor.com>

drizzle/0016_fix_send_reminder_at_column.sql

@@ -0,0 +1,3 @@
+-- 0015 may have been recorded before the column name was corrected (send_reminder_at vs sendReminderAt).
+ALTER TABLE "beenvoice_invoice" DROP COLUMN IF EXISTS "send_reminder_at";
+ALTER TABLE "beenvoice_invoice" ADD COLUMN IF NOT EXISTS "sendReminderAt" timestamp;