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`TCA`

The folder EXT:my_extension/Configuration/TCA/ may contain or override TCA (TYPO3 configuration array) data.

All files in this directory are automatically included during the TYPO3 bootstrap.

`<tablename>.php`

One file per database table, using the name of the table for the file, plus ".php". Only for new tables.

`Overrides`

For extending existing tables.

General advice: One file per database table, using the name of the table for the file, plus .php. For more information, see the chapter Extending the TCA array.