⚡ Live Sandbox: AI Dev Tool: Nextjs Expo Monorepo (pczl)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate with PostgreSQL Vector Search Extension
# ==============================================================================================
# This boilerplate provides a production-ready starter for building micro-SaaS applications
# using FastAPI, Pydantic v2, and PostgreSQL with vector search extension.

from fastapi import FastAPI, Depends
from fastapi.responses import JSONResponse
from fastapi.requests import Request
from pydantic import BaseModel
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, Session
from sqlalchemy.exc import SQLAlchemyError
from psycopg2.extras import Json

# Initialize FastAPI application
app = FastAPI(title="FastAPI Pydantic v2 Micro-SaaS Boilerplate",
              description="A production-ready starter for building micro-SaaS applications",
              version="1.0.0")

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

# Create database engine
engine = create_engine(DATABASE_URL)

# Create session maker
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

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