INSERT INTO settings (key, value, category, description, value_type, is_public)
VALUES
    ('mattermost_reminders_enabled', 'false', 'notifications', 'Send reminders to Mattermost', 'boolean', false),
    ('mattermost_webhook_url', '', 'notifications', 'Mattermost incoming webhook URL', 'string', false),
    ('mattermost_channel', '', 'notifications', 'Optional Mattermost channel override', 'string', false)
ON CONFLICT (key) DO NOTHING;