title: Add new fields in tt_content for all contentelements in typo3
body: <p>I tried to add new fields in tt_content for all Contentelemets - typo3 8.7.12. I used this tutorial: <a href="https://docs.typo3.org/typo3cms/CoreApiReference/8.7/ExtensionArchitecture/ExtendingTca/Examples/#example-2-extending-the-tt-content-table" rel="nofollow noreferrer">https://docs.typo3.org/typo3cms/CoreApiReference/8.7/ExtensionArchitecture/ExtendingTca/Examples/#example-2-extending-the-tt-content-table</a>
   - but nothing happens. I can't find any entry in the contentelements. the field iss added to the database.</p>
  
  <p>I tried this part of the tutorial with noch Problems: <a href="https://docs.typo3.org/typo3cms/CoreApiReference/8.7/ExtensionArchitecture/ExtendingTca/Examples/#example-1-extending-the-fe-users-table" rel="nofollow noreferrer">https://docs.typo3.org/typo3cms/CoreApiReference/8.7/ExtensionArchitecture/ExtendingTca/Examples/#example-1-extending-the-fe-users-table</a></p>
  
  <p>And I build a custom contentelement without any problems.</p>
  
  <p>Could anyone give me a hint to find the problem?</p>
  
  <p>Thanks
  Volker </p>