Fix Pydantic BaseSettings import error and improve application startup

- Update import from pydantic.BaseSettings to pydantic_settings.BaseSettings
- Add pydantic-settings==2.1.0 to requirements.txt for Pydantic v2 compatibility
- Implement application lifespan management for database initialization
- Add init_db.py for automatic database table creation and superuser setup
- Create test_imports.py for verifying import integrity
- Ensure proper startup sequence and error handling

This fixes the health check failure caused by Pydantic v2 migration changes.

🤖 Generated with BackendIM

Co-Authored-By: BackendIM <noreply@anthropic.com>

app/core/config.py

@@ -1,5 +1,5 @@
 import os
-from pydantic import BaseSettings
+from pydantic_settings import BaseSettings
 
 class Settings(BaseSettings):
     PROJECT_NAME: str = "School Portal API"

app/db/init_db.py

@@ -0,0 +1,25 @@
+from sqlalchemy.orm import Session
+from app.db.session import engine
+from app.db.base import Base
+from app.models import user, class_model, subject, grade, attendance, notification
+from app.core.config import settings
+from app.services.user import user_service
+from app.schemas.user import UserCreate
+from app.models.user import UserRole
+
+def init_db(db: Session) -> None:
+    # Create tables
+    Base.metadata.create_all(bind=engine)
+    
+    # Create initial superuser
+    user = user_service.get_by_email(db, email=settings.FIRST_SUPERUSER_EMAIL)
+    if not user:
+        user_in = UserCreate(
+            email=settings.FIRST_SUPERUSER_EMAIL,
+            password=settings.FIRST_SUPERUSER_PASSWORD,
+            first_name="System",
+            last_name="Administrator",
+            role=UserRole.ADMIN,
+            is_active=True
+        )
+        user = user_service.create(db, obj_in=user_in)

main.py

@@ -1,7 +1,21 @@
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
+from contextlib import asynccontextmanager
 from app.api.v1.api import api_router
 from app.core.config import settings
+from app.db.session import SessionLocal
+from app.db.init_db import init_db
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # Startup
+    db = SessionLocal()
+    try:
+        init_db(db)
+    finally:
+        db.close()
+    yield
+    # Shutdown
 
 app = FastAPI(
     title=settings.PROJECT_NAME,
@@ -9,7 +23,8 @@ app = FastAPI(
     description="School Portal API - A comprehensive school management system",
     openapi_url="/openapi.json",
     docs_url="/docs",
-    redoc_url="/redoc"
+    redoc_url="/redoc",
+    lifespan=lifespan
 )
 
 app.add_middleware(

requirements.txt

@@ -3,6 +3,7 @@ uvicorn[standard]==0.24.0
 sqlalchemy==2.0.23
 alembic==1.12.1
 pydantic[email]==2.5.0
+pydantic-settings==2.1.0
 python-jose[cryptography]==3.3.0
 passlib[bcrypt]==1.7.4
 python-multipart==0.0.6

test_imports.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+"""Test script to verify all imports work correctly."""
+
+try:
+    print("Testing core imports...")
+    from app.core.config import settings
+    print("✓ Config imported successfully")
+    
+    from app.core.security import create_access_token
+    print("✓ Security imported successfully")
+    
+    print("Testing database imports...")
+    from app.db.base import Base
+    from app.db.session import SessionLocal, engine
+    print("✓ Database imports successful")
+    
+    print("Testing model imports...")
+    from app.models import User, Class, Subject, Grade, Attendance, Notification
+    print("✓ All models imported successfully")
+    
+    print("Testing schema imports...")
+    from app.schemas import User as UserSchema, Token
+    print("✓ All schemas imported successfully")
+    
+    print("Testing service imports...")
+    from app.services.user import user_service
+    print("✓ All services imported successfully")
+    
+    print("Testing API imports...")
+    from app.api.v1.api import api_router
+    print("✓ API router imported successfully")
+    
+    print("Testing main application...")
+    from main import app
+    print("✓ Main application imported successfully")
+    
+    print("\n🎉 All imports successful! Application should start correctly.")
+    
+except Exception as e:
+    print(f"❌ Import error: {e}")
+    import traceback
+    traceback.print_exc()