- LlmUsage.infer_provider now returns "anthropic" for Bedrock /
Vertex shaped IDs (anthropic.* and anthropic/*), so cost-ledger
filtering by provider stays correct even when no per-MTok rate is
stored. Previously these IDs fell through to the "openai" default.
- AutoCategorizer drops the redundant nil sentinel from the
category_name enum — the union type [string, null] already permits
null, and some JSON Schema validators reject nil literals inside
enum arrays.
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