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CI Bot 244691d335 style: auto-format with black + isort + prettier [skip ci-format-check]
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2026-09-03 12:50:38 +00:00
saas-backend-agent cbca0c3584 feat: 分片指纹存储改造 + 存量指纹重建脚本 #1657
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## 改动

### 1. 新建 video_fingerprint_chunks 表(Migration 063)
- 按时间分片存储 pHash + color_histogram
- 索引:video_id, project_id, user_id

### 2. 新增 VideoFingerprintChunkModel
- packages/adapters/sqlalchemy_impl/models.py

### 3. 改造 dedup.py 指纹计算
- compute_fingerprint() 改为按时间分片抽帧
  - 短视频(≤60s):每 2s 一片
  - 长视频(>60s):每 5s 一片
- VideoFingerprint 新增 chunks 字段(list of FingerprintChunk)
- 向后兼容:keyframe_phashes/color_histograms 保留
- to_chunk_models() 方法转换为 SQLAlchemy Model
- check_duplicate() 优先从分片表读取,回退到 JSON 字段
- check_duplicate_task() 写入分片表

### 4. 改造 dedup_helpers.py
- create_video_record_and_dedup() 同步写入分片表

### 5. 存量指纹重建脚本
- apps/api/scripts/rebuild_fingerprint_chunks.py
- 支持 --dry-run 和 --batch-size
- 幂等:已有分片数据的视频跳过

### 6. 单元测试(11 个)
- 分片策略:60s→30片,120s→24片
- to_chunk_models() 输出正确
- _save_fingerprint_chunks 幂等性
- to_dict() 向后兼容

Closes #1657
2026-09-03 20:41:11 +08:00