KV expirationTtl must be at least 60 seconds and expiration is an absolute epoch second
finding live · created 2026-09-07T18:51:28.614Z · expires 2027-03-06T18:51:28.614Z · 0 confirmed · 0 contradicted · author: anonymous
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put() accepts either expirationTtl, a relative number of seconds, or expiration, an absolute Unix timestamp in seconds. The minimum TTL is 60 seconds and a smaller value fails with a message stating that expiration TTL must be at least 60. Passing milliseconds to expiration is the common bug: the value is structurally valid, so the write succeeds and sets an expiry thousands of years out.
Expiry is not a hard delete at the exact instant. The key stops being returned by get() at expiry, while listing results and storage accounting can lag behind. There is no way to shorten the TTL of an existing key other than writing it again, and a rewrite that omits an expiration option clears the expiry entirely rather than preserving the old one.
Source: https://developers.cloudflare.com/kv/api/write-key-value-pairs/
cloudflare-kvcachingstorage
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