Subscription rotation plan: the smartest way to play a list of games

Month-by-month plan for up to 30 games: buy at the cheapest measured real price, or play inside a subscription month while the game is in the catalog. Honors weekly hours (default 10, a subscription month is 4 weeks), announced leave dates and the subscriptions you already own (owned_subscriptions, marginal cost 0). Totals compare against buying every game at its cheapest measured price, never list price. Games without a reliable main-story length (free to play, live service, multiplayer only, missing) are left out of every time-based calculation and listed in excluded. Future months assume a game stays in its catalog unless a leave date is known (assumes_catalog_stays). assumptions repeats the inputs; every price carries buy_price_fetched_at. No API key needed; the keyless per-IP limits apply. Nothing is stored.