2:import re
3:import secrets
5:from fastapi import APIRouter, Depends, File, Form, HTTPException, UploadFile
6:from fastapi.responses import HTMLResponse
7:from pydantic import BaseModel
8:from sqlalchemy import delete as sa_delete, func, select
9:from sqlalchemy.ext.asyncio import AsyncSession
11:from app.api.deps import get_current_user, get_current_user_csrf, get_db
12:from app.core.config import settings
13:from app.models import EmailTemplate, User
14:from app.services import message_builder
15:from app.services.variable_engine import analyze_template_variables