Video pipeline (script→assets→storyboard→video→stitch): - robust split_script_into_segments (4 non-empty scenes), scene-aware storyboard/video prompts - link VideoSegment→ScriptSegment + storyboard-frame reference image (graceful text fallback) - idempotent poll_video_segment (no double-charge on repeated polling) - threaded export (no Celery worker needed) + poll-export endpoint - run_export_job rewritten to filter_complex: per-clip trim, xfade transitions, subtitle burn-in (Pillow PNG overlay; this ffmpeg lacks libass), BGM mix - upload-video-segment / upload-bgm / save-timeline endpoints - serializers embed asset preview URLs (beat assets pagination); Pillow added to requirements Also includes prior uncommitted backend work: account preferences/sessions, billing trend, product/asset endpoints, accounts 0002 migration. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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