AI Dev Tool: Fable 51 World Modeling

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Preview Code

```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS with PostgreSQL Vector Search Extension
# ==============================================================================
# This is a production-ready developer code asset for building high-demand micro-SaaS applications.
# It integrates FastAPI, Pydantic v2, and PostgreSQL Vector Search Extension for efficient data retrieval.

from fastapi import FastAPI, Depends
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List, Optional
from psycopg2 import connect
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, Session
from sqlalchemy.dialects.postgresql import TSVECTOR

# Initialize the FastAPI application
app = FastAPI()

# Define the database connection parameters
DB_HOST = "localhost"
DB_NAME = "mydatabase"
DB_USER = "myuser"
DB_PASSWORD = "mypassword"
# ... full runnable version includes tests & documentation