⚡ Live Sandbox: AI Dev Tool: PostgreSQL Vector Search (3d3j)

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```python
# AI Dev Tool: FastAPI Hono Cloudflare Worker D1 Starter
# Micro-SaaS Template with Pydantic v2 and PostgreSQL Vector Search Extension

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from cloudflare_worker import Worker
from hono import Hono
from psycopg2.extras import Json

# Initialize FastAPI app
app = FastAPI()

# Initialize OAuth2 password bearer
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Initialize PostgreSQL database connection
SQLALCHEMY_DATABASE_URL = "postgresql://user:password@host:port/dbname"
engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

# Define user model
class User(Base):
    __tablename__ = "users"
    id = Column(Integer, primary_key=True)
    username = Column(String, unique=True)
    email = Column(String, unique=True

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