feat: user cost

[wjiayis]

#58

Frontend

Database

docker exec mongodb mongosh --quiet paperdebugger --eval "db.llm_sessions.find().forEach(d => printjson(d))"

{
  _id: ObjectId('699950cddf3315112ae7e9bb'),
  user_id: ObjectId('6975da46d6096ac1b07342c2'),
  session_start: ISODate('2026-02-21T06:29:33.980Z'),
  session_expiry: ISODate('2026-02-21T11:29:33.980Z'),
  prompt_tokens: Long('27834'),
  completion_tokens: Long('917'),
  total_tokens: Long('28751'),
  request_count: Long('6')
}

Questions

Are we going to implement a per-user usage cap?

[Junyi-99]

Hi @wjiayis , thanks for another great contribution!

regarding your question: yes, we do need a per-user usage cap.

thanks again!

[wjiayis]

@Junyi-99 No problem! Yea cool, feel free let me know the token limit you decide to have! I feel that having some sort of progress bar would make more sense than the absolute token number.