⚡ Live Sandbox: AI Dev Tool: Bun Hono TypeSafe (2w4n)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# ================================================
# A production-ready starter boilerplate for building micro-SaaS applications
# using FastAPI, Pydantic v2, and PostgreSQL Vector Search Extension.

import os
import uvicorn
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel, validator
from typing import Optional
from psycopg2 import connect
from psycopg2.extras import DictCursor

# Define the PostgreSQL connection parameters
POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "localhost")
POSTGRES_DB = os.environ.get("POSTGRES_DB", "mydb")
POSTGRES_USER = os.environ.get("POSTGRES_USER", "myuser")
POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD", "mypassword")

# Define the Pydantic model for the user
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

# Define the FastAPI application
app = FastAPI()

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