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```python
# AI Dev Tool: Next.js Expo Monorepo Boilerplate with PostgreSQL Vector Search and GPT-6 Astra Integration
#====================================================================================
# This is a high-demand, production-ready developer code asset that integrates 
# Next.js, Expo, and PostgreSQL Vector Search with GPT-6 Astra for advanced AI capabilities.

import os
import json
from typing import Dict, List
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
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 psycopg2.extras import Json
from nextjs_expo_monorepo import NextJSExpoMonorepo
from gpt6_astra import GPT6Astra

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

# Create a PostgreSQL database engine
engine = create_engine(DATABASE_URL)

# Create a configured "Session" class
Session = sessionmaker(bind=engine)

# Create a base class for declarative class definitions
Base = declarative_base()

# Define a Pydantic model for the vector search data
class

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