AI Dev Tool: FastAPI Pydantic v2 (3zki)

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Preview Code

```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# ================================================
# This is a production-ready developer code asset for building micro-SaaS applications.
# It combines the power of FastAPI, Pydantic v2, and 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

# Initialize the FastAPI application
app = FastAPI()

# Define the database connection settings
DB_HOST = "localhost"
DB_NAME = "micro_saaS"
DB_USER = "postgres"
DB_PASSWORD = "password"

# Define the Pydantic models for the API
class User(BaseModel):
# ... full runnable version includes tests & documentation