UPDATE campaigns SET type = 'TOKENS' WHERE type = 'COINS';
UPDATE campaign_rules SET reward_type = 'TOKENS' WHERE reward_type = 'COINS';

COMMENT ON COLUMN campaigns.type IS 'Type of campaign: REWARD, POINTS, TOKENS, MIXED';
COMMENT ON COLUMN campaign_rules.reward_type IS 'Type of reward: POINTS, TOKENS, REWARD';