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根因：cv2.normalize() 返回 np.float32 数组，color_histograms 直接存进 dict 后 SQLAlchemy JSON 序列化时报 'float32 is not JSON serializable' 修复：VideoFingerprint.to_dict() 中统一转 Python 原生类型 - color_histograms: np.float32 → float - duration: 统一转 float - resolution: np.int32 → int