sub2api/backend/internal/service/usage_log.go

package service

import "time"

const (
	BillingTypeBalance      int8 = 0 // 钱包余额
	BillingTypeSubscription int8 = 1 // 订阅套餐
)

type UsageLog struct {
	ID        int64
	UserID    int64
	APIKeyID  int64
	AccountID int64
	RequestID string
	Model     string
	// ReasoningEffort is the request's reasoning effort level (OpenAI Responses API),
	// e.g. "low" / "medium" / "high" / "xhigh". Nil means not provided / not applicable.
	ReasoningEffort *string

	GroupID        *int64
	SubscriptionID *int64

	InputTokens         int
	OutputTokens        int
	CacheCreationTokens int
	CacheReadTokens     int

	CacheCreation5mTokens int `gorm:"column:cache_creation_5m_tokens"`
	CacheCreation1hTokens int `gorm:"column:cache_creation_1h_tokens"`

	InputCost         float64
	OutputCost        float64
	CacheCreationCost float64
	CacheReadCost     float64
	TotalCost         float64
	ActualCost        float64
	RateMultiplier    float64
	// AccountRateMultiplier 账号计费倍率快照（nil 表示历史数据，按 1.0 处理）
	AccountRateMultiplier *float64

	BillingType  int8
	Stream       bool
	DurationMs   *int
	FirstTokenMs *int
	UserAgent    *string
	IPAddress    *string

	// Cache TTL Override 标记（管理员强制替换了缓存 TTL 计费）
	CacheTTLOverridden bool

	// 图片生成字段
	ImageCount int
	ImageSize  *string

	CreatedAt time.Time

	User         *User
	APIKey       *APIKey
	Account      *Account
	Group        *Group
	Subscription *UserSubscription
}

func (u *UsageLog) TotalTokens() int {
	return u.InputTokens + u.OutputTokens + u.CacheCreationTokens + u.CacheReadTokens
}