[BUG] Usage Calculation for weekly limits hit within a short time with no large use.

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I hit my weekly limit, within 2 days. I haven't even used it a lot, and was around 14% usage, when all of a sudden I looked and was a 100%.

from my own monitoring in Grafana:

<img width="1168" height="830" alt="Image" src="https://github.com/user-attachments/assets/4686a2d8-4a28-488f-8729-8d227b1538c9" />

from /usage

<img width="800" height="333" alt="Image" src="https://github.com/user-attachments/assets/6315c9a0-6a7b-4cfd-86e8-7fcf41994ba4" />

Not much more to say about this, but it seems like a pretty bad bug.

Heres my statusline before and after:

<img width="413" height="71" alt="Image" src="https://github.com/user-attachments/assets/6691f977-5e49-4304-a2dc-3636ff4fe4a5" />

<img width="394" height="75" alt="Image" src="https://github.com/user-attachments/assets/977c5a8b-31ff-4346-8d64-324306d0e2a4" />

What Should Happen?

It should not spend my entire budget on nothing? And if it is for some reason my fault, the tools and usage view should show where this was spend, so it's not a big mystery for me. But I doubt this as my own monitoring would catch this?

Error Messages/Logs

There are none.

Steps to Reproduce

No idea. That's the issue.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.119 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

ghostty 1.3.1