Initial backend repository commit.

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

Made-with: Cursor

internal/model/message_read.go

@@ -0,0 +1,19 @@
+package model
+
+import (
+	"time"
+)
+
+// MessageRead 消息已读状态
+// 记录每个用户在每个会话中的已读位置
+type MessageRead struct {
+	ID             uint      `gorm:"primaryKey" json:"id"`
+	ConversationID int64     `gorm:"uniqueIndex:idx_conversation_user;not null" json:"conversation_id"`
+	UserID         uint      `gorm:"uniqueIndex:idx_conversation_user;not null" json:"user_id"`
+	LastReadSeq    int64     `gorm:"not null" json:"last_read_seq"` // 已读到的seq位置
+	UpdatedAt      time.Time `json:"updated_at" gorm:"autoUpdateTime"`
+}
+
+func (MessageRead) TableName() string {
+	return "message_reads"
+}