prepare fastapi root layout for server deployment

app/repositories/session_repository.py

@@ -0,0 +1,67 @@
+from datetime import datetime
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session, selectinload
+
+from app.models.training import SessionOrder, SessionSubmission, TrainingSession
+
+
+class SessionRepository:
+    """会话仓储：负责训练会话、检查申请和诊断治疗提交数据。"""
+
+    def __init__(self, db: Session) -> None:
+        self.db = db
+
+    def create_session(self, session: TrainingSession) -> TrainingSession:
+        """会话创建：保存训练会话主记录。"""
+        self.db.add(session)
+        self.db.flush()
+        return session
+
+    def get_owned_session(self, session_id: int, user_id: str) -> TrainingSession | None:
+        """会话归属校验：根据 session_id 和 user_id 查询会话。"""
+        stmt = (
+            select(TrainingSession)
+            .options(
+                selectinload(TrainingSession.case),
+                selectinload(TrainingSession.orders),
+                selectinload(TrainingSession.submission),
+            )
+            .where(TrainingSession.id == session_id, TrainingSession.user_id == user_id)
+        )
+        return self.db.scalar(stmt)
+
+    def update_status(self, session: TrainingSession, status: str) -> TrainingSession:
+        """状态流转：更新训练会话阶段状态。"""
+        session.status = status
+        if status == "diagnosis":
+            session.inquiry_completed_at = datetime.utcnow()
+        if status == "completed":
+            session.completed_at = datetime.utcnow()
+        self.db.flush()
+        return session
+
+    def create_order(self, order: SessionOrder) -> SessionOrder:
+        """检查申请保存：保存用户申请过的检查检验结果。"""
+        self.db.add(order)
+        self.db.flush()
+        return order
+
+    def get_order_by_item(self, session_id: int, item_code: str) -> SessionOrder | None:
+        """检查申请读取：按会话和检查编码获取已申请结果，用于幂等返回。"""
+        stmt = select(SessionOrder).where(
+            SessionOrder.session_id == session_id,
+            SessionOrder.item_code == item_code,
+        )
+        return self.db.scalar(stmt)
+
+    def get_submission(self, session_id: int) -> SessionSubmission | None:
+        """提交读取：获取当前会话的诊断治疗提交记录。"""
+        stmt = select(SessionSubmission).where(SessionSubmission.session_id == session_id)
+        return self.db.scalar(stmt)
+
+    def upsert_submission(self, submission: SessionSubmission) -> SessionSubmission:
+        """诊断治疗保存：创建或更新当前会话的提交记录。"""
+        self.db.add(submission)
+        self.db.flush()
+        return submission