-- Legg til warmup-innstillinger i channels.config
-- Default: warmup_mode = "all", warmup_value = null (last alt)
-- Andre moduser: "messages" (siste N), "days" (siste N dager), "none" (ikke last)

UPDATE channels
SET config = config
    || '{"warmup_mode": "all", "warmup_value": null}'::jsonb
WHERE NOT (config ? 'warmup_mode');