Support aggregation of attributes from multiple databases #144

Job	Run time
Linter	1m 23s
Quality control	35s
Security checks	27s
Unit tests, PHP 8.2, windows-latest	58s
Unit tests, PHP 8.3, windows-latest	1m 4s
Unit tests, PHP 8.3, ubuntu-latest	26s
Unit tests, PHP 8.4, ubuntu-latest	29s
Unit tests, PHP 8.2, ubuntu-latest	31s
Unit tests, PHP 8.1, windows-latest	1m 5s
Unit tests, PHP 8.4, windows-latest	1m 16s
Unit tests, PHP 8.1, ubuntu-latest	27s
Code coverage	0s
Cleanup artifacts	0s
	8m 41s

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