Initial backend repository commit.

Set up project files and add .gitignore to exclude local build/runtime artifacts.

Made-with: Cursor

internal/model/notification.go

@@ -0,0 +1,53 @@
+package model
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+// NotificationType 通知类型
+type NotificationType string
+
+const (
+	NotificationTypeLikePost    NotificationType = "like_post"
+	NotificationTypeLikeComment NotificationType = "like_comment"
+	NotificationTypeComment     NotificationType = "comment"
+	NotificationTypeReply       NotificationType = "reply"
+	NotificationTypeFollow      NotificationType = "follow"
+	NotificationTypeMention     NotificationType = "mention"
+	NotificationTypeSystem      NotificationType = "system"
+)
+
+// Notification 通知实体
+type Notification struct {
+	ID      string           `json:"id" gorm:"type:varchar(36);primaryKey"`
+	UserID  string           `json:"user_id" gorm:"type:varchar(36);not null;index:idx_notifications_user_read_created,priority:1"` // 接收者
+	Type    NotificationType `json:"type" gorm:"type:varchar(30);not null"`
+	Title   string           `json:"title" gorm:"type:varchar(200);not null"`
+	Content string           `json:"content" gorm:"type:text"`
+	Data    string           `json:"data" gorm:"type:jsonb"` // 相关数据（JSON）
+
+	// 已读状态
+	IsRead bool       `json:"is_read" gorm:"default:false;index:idx_notifications_user_read_created,priority:2"`
+	ReadAt *time.Time `json:"read_at" gorm:"type:timestamp"`
+
+	// 软删除
+	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"`
+
+	// 时间戳
+	CreatedAt time.Time `json:"created_at" gorm:"autoCreateTime;index:idx_notifications_user_read_created,priority:3,sort:desc"`
+}
+
+// BeforeCreate 创建前生成UUID
+func (n *Notification) BeforeCreate(tx *gorm.DB) error {
+	if n.ID == "" {
+		n.ID = uuid.New().String()
+	}
+	return nil
+}
+
+func (Notification) TableName() string {
+	return "notifications"
+}