Modal's serverless KV store gets its limit raised to infinity

Modal has upgraded its workspace-wide Dict key-value store with unlimited storage, durable data, a revised expiration policy that retains entries for seven days after their last read or write, and a `skip_if_exists` option for atomic conditional writes. These additions support LRU-like caching because frequently read values remain available, while conditional writes enable distributed locking and request deduplication across concurrent containers. The announcement demonstrates a caching pattern for an expensive web function in which the first request inserts a pending entry, starts the computation, and stores its eventual result, while simultaneous identical requests detect the existing entry and wait for or retrieve the same cached result. This approach can reduce backend load, avoid redundant function calls during traffic bursts, and improve response times, although users may need to update their Modal client to use the new locking-related flag.

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