add model identities and restore httpx router

backend/internal/models/source.go

@@ -3,17 +3,21 @@ package models
 import "time"
 
 type SenlinAgentSource struct {
-	ID                uint   `gorm:"primaryKey"`
-	ProjectID         uint   `gorm:"index;not null"`
-	CreatedBy         uint   `gorm:"index;not null"`
-	SourceInboxItemID *uint  `gorm:"index"`
-	Kind              string `gorm:"not null"`
-	Title             string `gorm:"not null"`
-	URL               string
-	FilePath          string
-	ContentText       string `gorm:"type:text"`
-	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"`
+	SourceInboxItemID       *uint   `gorm:"index"`
+	SourceInboxItemIdentity *string `gorm:"type:char(36);index"`
+	Kind                    string  `gorm:"not null"`
+	Title                   string  `gorm:"not null"`
+	URL                     string
+	FilePath                string
+	ContentText             string `gorm:"type:text"`
+	CreatedAt               time.Time
+	UpdatedAt               time.Time
 }
 
 func (SenlinAgentSource) TableName() string {