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shaw
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Follow-up fixes for the #3775 audit findings: - Bill Grok video generation per second of output, matching the xAI rate card: parse the request duration (1-15s, upstream default 8s) and compute cost as per-second price x duration x count. The built-in rate card values were already xAI per-second prices but were previously charged per video, undercharging up to 15x with a user-controlled duration. - Group video_price_* fields are now documented and surfaced as per-second rates (USD/s); admin UI labels, placeholders and hints updated accordingly. - Persist video_count/video_resolution/video_duration_seconds on usage_logs (migration 172) so video billing is auditable, and exempt any row with video_count > 0 from the image_size check constraint: a video billed via a token-mode channel price produces billing_mode='token' with image_count=1 and no image_size, which the previous constraint rejected, dropping the whole billing transaction. - Only refetch the group in apiKeyWithFreshGroupMediaPricing when the group object actually looks like it is missing media pricing fields (both media multipliers zero and all prices nil, impossible for a normally loaded group), removing a per-usage DB query for groups without overrides. - Frontend: drop the unused admin.groups.mediaPricing locale block, map cleared price inputs to null (create) / -1 (update, cleared via backend normalizePrice) instead of sending "" that failed *float64 unmarshalling, and align video price placeholders with the text-to-video default model (grok-imagine-video 0.05/0.07, 1080p only on 1.5 at 0.25).