⚡ Live Sandbox: AI Dev Tool: Nextjs Expo Monorepo (gr7j)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate with PostgreSQL Vector Search Extension
# =================================================================================================

from fastapi import FastAPI, Depends
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List
import psycopg2
from psycopg2 import Error
from psycopg2.extras import DictCursor
import uvicorn
from fastapi.middleware.cors import CORSMiddleware

# Initialize FastAPI App
app = FastAPI()

# Enable CORS
origins = [
    "http://localhost:8000",
    "http://localhost:3000",
]

app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# PostgreSQL Database Connection Settings
POSTGRES_HOST = "localhost"
POSTGRES_PORT = 5432
POSTGRES_USER = "postgres"
POSTGRES_PASSWORD = "postgres"
POSTGRES_DB = "mydatabase"

# Create a connection to the PostgreSQL database
def get_db_connection():
    """Get a connection to the PostgreSQL database"""
    try:
        conn = psycopg2.connect(
            host=POSTGRES_HOST,
            port=POSTGRES

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