Method DeletePreference

pkg/memory/preference.go:252–283

DeletePreference 删除偏好

(
	ctx context.Context,
	userID string,
	category PreferenceCategory,
	key string,
)

// DeletePreference 删除偏好
func (pm *PreferenceManager) DeletePreference(
	ctx context.Context,
	userID string,
	category PreferenceCategory,
	key string,
) error {
	pm.mu.Lock()
	defer pm.mu.Unlock()

	// 从主存储中删除
	prefs := pm.preferences[userID]
	newPrefs := []*Preference{}
	for _, p := range prefs {
		if p.Category != category || p.Key != key {
			newPrefs = append(newPrefs, p)
		}
	}
	pm.preferences[userID] = newPrefs

	// 从索引中删除
	indexKey := fmt.Sprintf("%s:%s", userID, category)
	indexPrefs := pm.categoryIndex[indexKey]
	newIndexPrefs := []*Preference{}
	for _, p := range indexPrefs {
		if p.Key != key {
			newIndexPrefs = append(newIndexPrefs, p)
		}
	}
	pm.categoryIndex[indexKey] = newIndexPrefs

	return nil
}

// GetTopPreferences 获取强度最高的 N 个偏好
func (pm *PreferenceManager) GetTopPreferences(