Important: #81023 - Drop EXT:typo3db_legacy 

See forge#81023

Description 

The legacy extension typo3db_legacy that contains the old non doctrine based database API known as $GLOBALS['TYPO3_DB'] has been dropped from core.

The extension is available in the TER and an install tool upgrade wizard is in place to download and load the extension as compatibility layer for extension that still rely on $GLOBALS['TYPO3_DB'] in TYPO3 v9.

If an extension should be compatible with both TYPO3 v8 and TYPO3 v9 and relies in v9 on typo3db_legacy, it should list typo3db_legacy as suggests dependency in it's ext_emconf.php file. This way, the dependency is optional and needs to be manually loaded by an administrator in the TYPO3 v9 backend, but the core still ensures typo3db_legacy is loaded before the affected extension:

'constraints' => [
    ...
    'suggests' => [
        'typo3db_legacy' => '1.0.0-1.0.99',
    ],
],
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Extensions that dropped support for TYPO3 v8 (or keeps separate branches) and did not migrate to doctrine in its v9 version, should list typo3db_legacy in the depends section of ext_emconf.php:

'constraints' => [
    ...
    'depends' => [
        'typo3db_legacy' => '1.0.0-1.0.99',
    ],
],
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