优化数据表结构

models/user_authn.py

@@ -0,0 +1,43 @@
+from typing import TYPE_CHECKING
+
+from sqlalchemy import Column, Text
+from sqlmodel import Field, Relationship
+
+from .base import TableBase
+
+if TYPE_CHECKING:
+    from .user import User
+
+
+class UserAuthn(TableBase, table=True):
+    """用户 WebAuthn 凭证模型，与 User 为多对一关系"""
+
+    __tablename__ = "user_authn"
+
+    credential_id: str = Field(max_length=255, unique=True, index=True)
+    """凭证 ID，Base64 编码"""
+
+    credential_public_key: str = Field(sa_column=Column(Text))
+    """凭证公钥，Base64 编码"""
+
+    sign_count: int = Field(default=0, ge=0)
+    """签名计数器，用于防重放攻击"""
+
+    credential_device_type: str = Field(max_length=32)
+    """凭证设备类型：'single_device' 或 'multi_device'"""
+
+    credential_backed_up: bool = Field(default=False)
+    """凭证是否已备份"""
+
+    transports: str | None = Field(default=None, max_length=255)
+    """支持的传输方式，逗号分隔，如 'usb,nfc,ble,internal'"""
+
+    name: str | None = Field(default=None, max_length=100)
+    """用户自定义的凭证名称，便于识别"""
+
+    # 外键
+    user_id: int = Field(foreign_key="user.id", index=True)
+    """所属用户ID"""
+
+    # 关系
+    user: "User" = Relationship(back_populates="authns")