Cannot upload QC metric changes, DocDB error.

**Describe the bug**
When trying to submit QC metrics for this session (ecephys_787625_2025-06-17_13-36-13_sorted-opto_2025-06-19_05-48-01) I get a DocDB error (see screenshot below). This session is also missing a couple plots such as unit yield and firing rate.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to https://qc.allenneuraldynamics.org/view?name=ecephys_787625_2025-06-17_13-36-13_sorted-opto_2025-06-19_05-48-01&active_path=%284%2C%29
2. Go to any plot and assign it a QC pass or fail
3. Try to upload changes and see error

**Expected behavior**
Should say all changes uploaded and the auto close the upload changes pop up window.

**Screenshots**

**Desktop (please complete the following information):**
- OS: Windows 11
- Browser: Edge
- Version

**Smartphone (please complete the following information):**
- Device: [e.g. iPhone6]
- OS: [e.g. iOS8.1]
- Browser [e.g. stock browser, safari]
- Version: 152.0.4191.66

**Additional context**
Most of the sessions I am doing work, even when uploading many more changes than this session.

Reproduce the failure at the supplied QC portal URL by assigning a pass or fail and selecting Upload changes; compare this session with one that uploads successfully. Trace the DocDB error and the missing unit-yield and firing-rate plots, then verify that a successful upload reports completion and closes the dialog.

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