本来の期限に加えて自分の中での目標期限を設定できるよう仕様追加

internal/models/assignment.go

@@ -14,6 +14,7 @@ type Assignment struct {
 	Subject                string     `json:"subject"`
 	Priority               string     `gorm:"not null;default:medium" json:"priority"`
 	DueDate                time.Time  `gorm:"not null" json:"due_date"`
+	SoftDueDate            *time.Time `json:"soft_due_date,omitempty"`
 	IsCompleted            bool       `gorm:"default:false" json:"is_completed"`
 	IsArchived             bool       `gorm:"default:false;index" json:"is_archived"`
 	CompletedAt            *time.Time `json:"completed_at,omitempty"`
@@ -23,7 +24,6 @@ type Assignment struct {
 	UrgentReminderEnabled  bool       `gorm:"default:true" json:"urgent_reminder_enabled"`
 	LastUrgentReminderSent *time.Time `json:"last_urgent_reminder_sent,omitempty"`
 
-	// Recurring assignment reference
 	RecurringAssignmentID *uint                `gorm:"index" json:"recurring_assignment_id,omitempty"`
 	RecurringAssignment   *RecurringAssignment `gorm:"foreignKey:RecurringAssignmentID" json:"-"`
 
@@ -34,6 +34,13 @@ type Assignment struct {
 	User *User `gorm:"foreignKey:UserID" json:"user,omitempty"`
 }
 
+func (a *Assignment) GetEffectiveSoftDueDate() time.Time {
+	if a.SoftDueDate != nil {
+		return *a.SoftDueDate
+	}
+	return a.DueDate.Add(-48 * time.Hour)
+}
+
 func (a *Assignment) IsOverdue() bool {
 	return !a.IsCompleted && time.Now().After(a.DueDate)
 }