chore: initialize medical consultation agent demo

backend/app/models/user.py

@@ -0,0 +1,33 @@
+from datetime import datetime
+
+from sqlalchemy import DateTime, Integer, JSON, Numeric, String
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base
+from app.models.mixins import TimestampMixin
+
+
+class User(TimestampMixin, Base):
+    """宿主用户引用：保存外部 user_id，不承担登录注册职责。"""
+
+    __tablename__ = "users"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    external_user_id: Mapped[str] = mapped_column(String(128), nullable=False, unique=True, index=True)
+    display_name: Mapped[str | None] = mapped_column(String(100), nullable=True)
+
+
+class UserLearningProfile(TimestampMixin, Base):
+    """学习档案模型：聚合完整评价记录形成用户能力画像。"""
+
+    __tablename__ = "user_learning_profiles"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    user_id: Mapped[str] = mapped_column(String(128), nullable=False, index=True)
+    tenant_id: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)
+    total_evaluations: Mapped[int] = mapped_column(Integer, default=0)
+    avg_score_percentage: Mapped[float | None] = mapped_column(Numeric(6, 2))
+    avg_score_five_point: Mapped[float | None] = mapped_column(Numeric(4, 2))
+    weak_dimensions: Mapped[list | None] = mapped_column(JSON)
+    last_evaluation_id: Mapped[int | None] = mapped_column(Integer)
+    last_trained_at: Mapped[datetime | None] = mapped_column(DateTime, index=True)