add model identities and restore httpx router

backend/internal/models/task.go

@@ -3,18 +3,23 @@ package models
 import "time"
 
 type SenlinAgentTask struct {
-	ID                uint   `gorm:"primaryKey"`
-	ProjectID         uint   `gorm:"index;not null"`
-	CreatedBy         uint   `gorm:"index;not null"`
-	AssigneeID        *uint  `gorm:"index"`
-	SourceInboxItemID *uint  `gorm:"index"`
-	Title             string `gorm:"not null"`
-	Description       string
-	Status            string `gorm:"not null;default:open"`
-	SortOrder         int    `gorm:"not null;default:0"`
-	DueAt             *time.Time
-	CreatedAt         time.Time
-	UpdatedAt         time.Time
+	ID                      uint    `gorm:"primaryKey"`
+	Identity                string  `gorm:"type:char(36);uniqueIndex"`
+	ProjectID               uint    `gorm:"index;not null"`
+	ProjectIdentity         string  `gorm:"type:char(36);index"`
+	CreatedBy               uint    `gorm:"index;not null"`
+	CreatedByIdentity       string  `gorm:"type:char(36);index"`
+	AssigneeID              *uint   `gorm:"index"`
+	AssigneeIdentity        *string `gorm:"type:char(36);index"`
+	SourceInboxItemID       *uint   `gorm:"index"`
+	SourceInboxItemIdentity *string `gorm:"type:char(36);index"`
+	Title                   string  `gorm:"not null"`
+	Description             string
+	Status                  string `gorm:"not null;default:open"`
+	SortOrder               int    `gorm:"not null;default:0"`
+	DueAt                   *time.Time
+	CreatedAt               time.Time
+	UpdatedAt               time.Time
 }
 
 func (SenlinAgentTask) TableName() string {