缓存无法命中问题

[scarecrow-x]

多次反复提交相同的prompt返回的prompt_cache_hit_tokens一直为0
`const completion = await openai.chat.completions.create({
messages: [
{
role: "system",
content: "提供一个方案，解决mongoose并发更新的赛马问题",
},
],
model: "deepseek-chat",
});

await delay(5000);

const completion2 = await openai.chat.completions.create({
messages: [
{
role: "system",
content: "提供一个方案，解决mongoose并发更新的赛马问题",
},
{
role: "assistant",
content: completion.choices[0].message.content,
},
{
role: "system",
content: "我的场景是在一个高并发的场景下，如何保证更新的原子性？",
},
],
model: "deepseek-chat",
});

console.log(JSON.stringify(completion2.usage));
console.log(completion2.choices[0].message.content);

{"prompt_tokens":1015,"completion_tokens":1457,"total_tokens":2472,"prompt_cache_hit_tokens":0,"prompt_cache_miss_tokens":1015}
`