saas-backend-agent
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Two-phase pipeline: worker renders and precomputes dedup metadata, but does
not create GeneratedVideo until user confirms cover in Step 5.
Domain
- Add GenerationTaskStatus.AWAITING_COVER (non-terminal)
- Add mark_awaiting_cover(): progress=100, clears error, leaves completed_at unset
- Transitions: running → {awaiting_cover, completed, failed, cancelled};
awaiting_cover → {completed, failed, cancelled}
- _missing_ aliases: waiting_cover/video_ready/rendered/pending_cover
- Keep running→completed for backward compat / legacy paths
Worker (apps/worker/worker_app/tasks/generation.py)
- Replace _record_video_and_dedup with _precompute_render_metadata:
calls compute_render_fingerprint_and_dedup, returns dict without DB writes
- Remove runtime batch-rerender decision (should_rerender_for_batch_dedup path);
dedup now happens at finalize time against all finished records
- Persist precomputed metadata into task.extra_meta['rendered_output']
- Final status: mark_awaiting_cover instead of mark_completed
Dedup helpers (apps/worker/video_processing/dedup_helpers.py)
- New compute_render_fingerprint_and_dedup(video_path,...): local fingerprint
+ historical dedup + batch dedup, returns fully serializable dict
(fingerprint_dict, fingerprint_chunks list, is_duplicate, duplicate_of, etc.)
- create_video_record_and_dedup() retained for compat/tests; now supports
pre_dedup_result to reuse worker-precomputed data without re-reading video
- VideoFingerprint.from_dict() added to reconstruct from serialized form
Application layer (packages/application/generated_video_finalize.py)
- RenderedOutput dataclass + from_dict() for deserializing worker output
- finalize_generated_video(): creates GeneratedVideo, bulk-inserts
VideoFingerprintChunk rows, commits; API-layer free
API service (apps/api/app/services/generation_finalize_service.py)
- GenerationFinalizeService.finalize_task(task_id, user_id, cover_url):
* permission / existence check
* idempotent: if GeneratedVideo already exists for this task, just ensure
task is marked completed and return (safe for double-click)
* status gate: only awaiting_cover (or legacy completed) accepted
* cover resolution: explicit cover_url arg > task.cover_url
* delegates to finalize_generated_video, marks task completed,
clears extra_meta['rendered_output']
API endpoint (apps/api/app/api/routes/generation_tasks.py)
- POST /api/v1/generation/tasks/{task_id}/finalize
- Body: { cover_url?: string }; returns video_id/cover_url/file_url/is_duplicate
- Adjust confirm_generation fast path: mark_confirmed keeps task in
awaiting_cover (don't auto-complete); historical 'completed' previews
migrated back to awaiting_cover
- Preview-reuse accepts awaiting_cover tasks
Preview / task center
- GET /preview/{task_id} constructs lightweight _PreviewVideo from
extra_meta.rendered_output when task is awaiting_cover
- Task center step map: awaiting_cover → 等待确认封面; status filter includes it
Tests
- tests/unit/test_finalize_generation.py: 13 new tests covering status
transitions, mark_awaiting_cover, RenderedOutput parsing, finalize use case
(success / missing metadata / cover fallback)
- test_generation_task.py updated for 6th status value
- Full suite: 15978 passed, 28 skipped (matches #2023 baseline, no regressions)
- black/isort/ruff clean
Out of scope (intentionally untouched)
- AI avatar pipeline uses separate AiAvatarRenderJob; finalize_job and
/{job_id}/finalize are unchanged
- PR #2023 subtitle font scaling files (ass_subtitle_builder,
video_filter_builder, subtitle_generator) not modified
- No DB migration: GenerationTaskModel.status is String(20) without CHECK
- Temp file cleanup: leave to existing periodic job