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```python
# AI Dev Tool: Inception-Style Curved Map Navigation with PIM-Optimized PostgreSQL Vector Search
# Description: A high-performance, production-ready developer code asset for building intelligent navigation systems
# Category: Production Starter Boilerplate

import os
import psycopg2
from psycopg2 import extras
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List, Dict

# Define the application
app = FastAPI()

# Define the PostgreSQL connection parameters
POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "localhost")
POSTGRES_PORT = os.environ.get("POSTGRES_PORT", 5432)
POSTGRES_USER = os.environ.get("POSTGRES_USER", "postgres")
POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD", "postgres")
POSTGRES_DB = os.environ.get("POSTGRES_DB", "navigation")

# Establish a connection to the PostgreSQL database
def get_db_connection():
    """Returns a connection to the PostgreSQL database"""
    try:
        return psycopg2.connect(
            host=POSTGRES_HOST,
            port=POSTGRES_PORT,
            user=POSTGRES_USER,
            password=POSTGRES_PASSWORD,
            database=POSTGRES

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