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Design KV-cache reuse for hours-long 32K chat sessions, including edits, hot weight swaps, and eviction.

Reprefilling the whole history every turn makes a long chat O(n^2). The real design is a radix tree of KV blocks with copy-on-write branching, a weight-epoch tag, and an eviction policy that protects live turns.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

Reprefilling the whole history every turn makes a long chat O(n^2). The real design is a radix tree of KV blocks with copy-on-write branching, a weight-epoch tag, and an eviction policy that protects live turns.

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