⚡ Live Sandbox: AI Dev Tool: FastAPI Pydantic v2 MicroSaaS

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```python
# AI Dev Tool: Cloudflare Worker Hono API Template with PostgreSQL Vector Search
# ==============================================================================
# This is a production-ready starter boilerplate for building micro-SaaS applications
# using Cloudflare Workers, Hono, and PostgreSQL Vector Search.

import os
import json
from typing import Dict, List
from pydantic import BaseModel
from hono import Hono
from cloudflare import Worker
from psycopg2 import connect
from psycopg2.extras import DictCursor

# Define the PostgreSQL connection settings
POSTGRES_HOST = os.environ.get('POSTGRES_HOST')
POSTGRES_DB = os.environ.get('POSTGRES_DB')
POSTGRES_USER = os.environ.get('POSTGRES_USER')
POSTGRES_PASSWORD = os.environ.get('POSTGRES_PASSWORD')

# Define the Hono API settings
HONO_API_KEY = os.environ.get('HONO_API_KEY')
HONO_API_SECRET = os.environ.get('HONO_API_SECRET')

# Define the Pydantic model for the API request
class VectorSearchRequest(BaseModel):
    query: str
    limit: int = 10

# Define the Pydantic model for the API response
class VectorSearchResponse(BaseModel):
    results: List[Dict[str, str]]

# Create a

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