AI Dev Tool: FastAPI Pydantic v2 (1esa)

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Preview Code

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

from fastapi import FastAPI, Depends
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import Optional
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String
from sqlalchemy.exc import SQLAlchemyError
import psycopg2
import os

# Initialize the FastAPI application
app = FastAPI()

# Define the database connection URL
DATABASE_URL = os.environ.get("DATABASE_URL")

# Create a database engine
# ... full runnable version includes tests & documentation