⚡ Live Sandbox: AI Dev Tool: AGENTSmd AINative SaaS (zq5j)

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

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, Field
from typing import Optional
import psycopg2
from psycopg2 import extras
import os

# PostgreSQL Connection Settings
POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "localhost")
POSTGRES_DB = os.environ.get("POSTGRES_DB", "mydb")
POSTGRES_USER = os.environ.get("POSTGRES_USER", "myuser")
POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD", "mypassword")

# Create a new FastAPI app
app = FastAPI()

# OAuth2 Scheme
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Define a Pydantic model for user authentication
class User(BaseModel):
    username: str = Field(..., example="john_doe")
    email: str = Field(..., example="john@example.com")
    full_name: Optional[str] = Field(None, example="John Doe")
    disabled: Optional[bool] = Field(False, example

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