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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, EmailStr
from pydantic import Field
from typing import Optional
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String
from sqlalchemy import func
from sqlalchemy.exc import IntegrityError
from psycopg2.extras import Json
# Initialize FastAPI App
app = FastAPI()
# OAuth2 Scheme
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
# PostgreSQL Database Connection
SQLALCHEMY_DATABASE_URL = "postgresql://user:password@localhost/dbname"
engine = create_engine(SQLALCHEMY_DATABASE_URL)
# ... full runnable version includes tests & documentation
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