fix: 修复自定义指标创建时间异常存储错误

features/pm/kpi_c_report/model.go

@@ -4,7 +4,6 @@ import (
 	"database/sql/driver"
 	"encoding/json"
 	"fmt"
-	"time"
 )
 
 type KpiCVal struct {
@@ -26,7 +25,7 @@ type KpiCReport struct {
 	Index       int16      `gorm:"column:index" json:"index"`
 	Granularity *int8      `gorm:"column:granularity;default:60" json:"granularity,omitempty"` //Time granualarity: 5/10/.../60/300 (second)
 	KpiValues   KpiCValues `gorm:"column:kpi_values;type:json" json:"kpiValues,omitempty"`
-	CreatedAt   *time.Time `gorm:"column:created_at;default:current_timestamp()" json:"createdAt,omitempty"`
+	CreatedAt   int64      `gorm:"column:created_at" json:"createdAt,omitempty"`
 	TenantID    *string    `gorm:"column:tenant_id;default:NULL" json:"tenantID,omitempty"`
 }