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Ethan0x0000 51547fa216 feat(db): add upstream_model column to usage_logs
Add nullable VARCHAR(100) column to record the actual model sent to upstream providers when model mapping is applied. NULL means no mapping — the requested model was used as-is.

Includes migration, concurrent index for aggregation queries, Ent schema regeneration, and migration README correction (forward-only runner, not goose).
2026-03-17 19:25:17 +08:00
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