refactor(documents): split document models

backend/internal/models/document_share.go

@@ -0,0 +1,19 @@
+package models
+
+import "time"
+
+type SaDocumentShare struct {
+	ID               uint       `gorm:"primaryKey"`
+	Identity         string     `gorm:"type:char(36);uniqueIndex"`
+	DocumentID       uint       `gorm:"index;not null"`
+	DocumentIdentity string     `gorm:"type:char(36);index"`
+	CreatedBy        uint       `gorm:"index;not null"`
+	TokenHash        string     `gorm:"size:64;uniqueIndex;not null"`
+	ExpiresAt        time.Time  `gorm:"index;not null"`
+	RevokedAt        *time.Time `gorm:"index"`
+	CreatedAt        time.Time
+}
+
+func (SaDocumentShare) TableName() string {
+	return "sa_document_shares"
+}