title: Is it necessary to define Referential Actions in SQLAlchemy's Model-Definitions, although they are defined inside InnoDB-Table?
body: <p>I have several MySQL InnoDB tables (<code>authors, books, countrys</code>) in a Database and they are all linked by an <code>association_table</code> which looks like this:</p>
  
  <pre><code>id, fk_author_id, fk_book_id, fk_country_id
  </code></pre>
  
  <p>I have defined some Referential Actions for the foreignkeys (fk_). Do I have to define the same referencial Actions within the Model-Definitions in SQLAlchemy, or does SQLAlchemy collect this information while reflecting?</p>