Add configuration and database core

app/models.py

@@ -1 +1,32 @@
 """Pydantic request and response models."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from pydantic import BaseModel, Field
+
+
+class JoinRequest(BaseModel):
+    student_id: str = Field(min_length=1, max_length=80)
+    name: str = Field(min_length=1, max_length=120)
+
+
+class AdminLoginRequest(BaseModel):
+    password: str
+
+
+class QuizCreateRequest(BaseModel):
+    title: str | None = None
+    pool_json: dict[str, Any] | str
+    time_limit_default: int | None = None
+
+
+class SessionCreateRequest(BaseModel):
+    quiz_id: int
+
+
+class SubmitMessage(BaseModel):
+    type: str
+    question_idx: int
+    answer: str