⚡ Live Sandbox: AI Dev Tool: FastAPI Pydantic v2 (loon)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate with PostgreSQL Vector Search Extension
# =================================================================================================
# This is a production-ready developer code asset for building micro-SaaS applications using FastAPI, Pydantic v2, and PostgreSQL.
# It includes a starter boilerplate for creating RESTful APIs with automatic API documentation, validation, and error handling.
# Additionally, it integrates the PostgreSQL Vector Search Extension for efficient full-text search capabilities.

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel, Field
from typing import List, Optional
from psycopg2 import connect, Error
from psycopg2.extras import DictCursor
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(title="FastAPI Pydantic v2 Micro-SaaS Boilerplate", description="A production-ready starter boilerplate for building micro-SaaS applications.")

# Define the PostgreSQL database connection settings
DB_HOST = "localhost"
DB_NAME = "mydatabase"
DB_USER = "myuser"
DB_PASSWORD = "mypassword"

# Create a PostgreSQL database engine
engine =

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