Important: #107629 - Reference Index check moved to Install Tool

Description

The Reference Index check and update functionality has been moved from the System > DB Check module (EXT:lowlevel) to the Maintenance section of the Install Tool (EXT:install).

This change makes this essential administrative tool more accessible and better organized alongside other common maintenance tasks like database compare, cache management, and folder structure checks.

Why this change?

The Reference Index is a critical system component that tracks relationships between records in TYPO3. Checking and updating it is a routine maintenance task that administrators perform regularly, similar to:

Analyzing database structure
Clearing caches
Checking folder permissions

Previously, this functionality was hidden in the DB Check module of EXT:lowlevel, which made it:

Hard to discover: Administrators had to know where to look
Inconsistent: Other maintenance tools were in the Install Tool
Less accessible: Required an additional system extension

Impact

For Administrators:

The Reference Index check and update functionality is now directly available in the Install Tool under Maintenance > Check and Update Reference Index.

Key benefits:

Better visibility: Found alongside other maintenance tools
No extra dependencies: Works out-of-the-box without EXT:lowlevel
Consistent location: All system maintenance tasks in one place
Faster access: Direct access via Install Tool
Same functionality: Check and update operations work exactly as before

CLI Access:

The command-line interface remains unchanged and continues to work as before:

# Check reference index
vendor/bin/typo3 referenceindex:update --check

# Update reference index
vendor/bin/typo3 referenceindex:update

Migration

No migration is required. Administrators should simply use the new location in the Install Tool's Maintenance section instead of the DB Check module.

The functionality works identically to the previous implementation.