title: Airflow DAG processing for new clients
body: <p>I'm new to Airflow and I understand how DAGs' <code>start_date</code> + <code>time_interval</code> work for my own company for example pulling Google Ads historical data.</p>
  <p>But we're doing analysis for multiple clients data.</p>
  <p>How do I structure DAGs to handle new client's data? I don't want to create a new DAG for every client onboarded, even if programmatically, that seems poor.</p>
  <p>Also since new clients can come in any time, I'd like to pull data when clients create accounts which is event driven. I could use the experimental Event Driven API but is there a better approach?</p>
  <p>Is Airflow not a good solution for this use case?</p>