server : create context checkpoint on slot restore#24956
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A restored slot had no context checkpoint, so the next request with cache_prompt found no reuse anchor and reprocessed the entire restored prefix (cache_n=0), defeating the purpose of /slots restore. Create a checkpoint spanning the restored span so the restored KV is reused. Tested on a transformer model (gemma-4-12B, 15924-token prefix): a restore followed by an identical prompt went from prompt_n=15924/15924 (full reprocess) to prompt_n=1/15924 (reused). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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A restored slot had no context checkpoint, so the next request with cache_prompt found no reuse anchor and reprocessed the entire restored prefix (cache_n=0), defeating the purpose of /slots restore. Create a checkpoint spanning the restored span so the restored KV is reused.
Tested on a transformer model (gemma-4-12B, 15924-token prefix): a restore followed by an identical prompt went from prompt_n=15924/15924 (full reprocess) to prompt_n=1/15924 (reused).
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