Feature Flag Timeline Store
Feature Flag Timeline Store Track feature flag changes over time with time-travel queries. - set(ts, key, value): Set flag value at timestamp - get(ts, key): Get current value at timestamp (or "null" if not set) - getAt(ts, key): Get value at or before timestamp - delete(ts, key): Delete flag at timestamp (tombstone) - serialize()/deserialize(): Persist and restore history
Feature flags seem simple until you need to query what was enabled last Tuesday. This problem tests whether you can maintain a timeline with out-of-order updates and soft deletes—then serialize it for persistence. The trap is handling tombstones correctly in time-travel queries.
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