The log shows the 401 is gone — the latest attempt was accepted (200 OK,
job-551586975a13) and reached the trainer. It then failed on the SAME error as
before the key was fixed:

  RuntimeError: longcat LoRA training needs `dataset_config`

Because there are two training paths and only one of them was wired. Step 4b (the
batch stage) builds a SimpleTuner dataset from the rendered clips. The per-profile
Train button on the Characters page — which is what was being pressed — assembled
its kwargs independently and never passed dataset_config, so the server refused
the job exactly as it is supposed to.

Both paths now build the same dataset through the same function. When it cannot
(no clips rendered yet, clips too short, too few), the button says so and names
the remedy instead of letting the server answer with a stack trace.

Surveyed against the real township output before claiming it works: 151 clips and
outcomes carry prompts, and at the default 93-frame / 8-clip threshold all 6
fighters and all 4 environments qualify — khumalo has 19 usable clips, dlamini 11.

Still true, and unchanged by this: no LongCat training has ever RUN. This gets the
job past the server's gate; what SimpleTuner then does with it is unproven.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0182DhR1eFNPQyGmDrpHbedY