add usage

store/usage.go

@@ -0,0 +1,38 @@
+package store
+
+import "time"
+
+type DailyUsage struct {
+	ID              int       `gorm:"column:id"`
+	UserID          int       `gorm:"column:user_id primarykey"`
+	Date            time.Time `gorm:"column:date"`
+	SKU             string    `gorm:"column:sku"`
+	PromptUnits     int       `gorm:"column:prompt_units"`
+	CompletionUnits int       `gorm:"column:completion_units"`
+	TotalUnit       int       `gorm:"column:total_unit"`
+	Cost            string    `gorm:"column:cost"`
+}
+
+func (DailyUsage) TableName() string {
+	return "daily_usages"
+}
+
+type Usage struct {
+	ID              int       `gorm:"column:id"`
+	PromptHash      string    `gorm:"column:prompt_hash"`
+	UserID          int       `gorm:"column:user_id"`
+	Date            time.Time `gorm:"column:date"`
+	SKU             string    `gorm:"column:sku"`
+	PromptUnits     int       `gorm:"column:prompt_units"`
+	CompletionUnits int       `gorm:"column:completion_units"`
+	TotalUnit       int       `gorm:"column:total_unit"`
+	Cost            string    `gorm:"column:cost"`
+}
+
+func (Usage) TableName() string {
+	return "usages"
+}
+
+func QueryUsage(from, to time.Time) error {
+	return nil
+}