【add】Create user alias table and functionality

api/app/models/user_alias_model.py

@@ -0,0 +1,24 @@
+import datetime
+import uuid
+
+from sqlalchemy import Column, DateTime, ForeignKey, String, Text
+from sqlalchemy.dialects.postgresql import UUID, JSONB
+from sqlalchemy.orm import relationship
+
+from app.db import Base
+
+
+class UserAlias(Base):
+    """用户别名表 - 存储用户的别名信息"""
+    __tablename__ = "user_aliases"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, nullable=False, index=True)
+    end_user_id = Column(UUID(as_uuid=True), ForeignKey("end_users.id"), nullable=False, index=True, comment="关联的终端用户ID")
+    other_name = Column(String, nullable=False, comment="关联的用户名称")
+    aliases = Column(JSONB, nullable=True, comment="用户别名列表（JSON数组）")
+    meta_data = Column(JSONB, nullable=True, comment="用户相关的扩展信息（JSON格式）")
+    created_at = Column(DateTime, default=datetime.datetime.now, comment="创建时间")
+    updated_at = Column(DateTime, default=datetime.datetime.now, onupdate=datetime.datetime.now, comment="更新时间")
+
+    # 与 EndUser 的关系
+    end_user = relationship("EndUser", back_populates="aliases")