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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: A production-ready starter boilerplate for building micro-SaaS applications using FastAPI and Pydantic v2.
# Author: [Your Name]

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel, validator
from typing import List, Optional
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

# Initialize the FastAPI application
app = FastAPI()

# Define the database connection URL
DATABASE_URL = "postgresql://user:password@host:port/dbname"

# Create a database engine
engine = create_engine(DATABASE_URL)

# Create a configured "Session" class
Session = sessionmaker(bind=engine)

# Create a base class for declarative class definitions
Base = declarative_base()

# Define a Pydantic model for user data
class User(BaseModel):
    id: int
    name: str
    email: str

@validator("email")
    def validate_email(cls, v):
        if "@" not in v:
            raise ValueError("Invalid email address")
        return v

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