add UNIQUE or UNQ name to unique indexes in database tables

[jakwinkler]

Description (*)

This table eav_attribute_label has an index defined in db_schema.xml

    <index referenceId="EAV_ATTRIBUTE_LABEL_ATTRIBUTE_ID_STORE_ID" indexType="btree">
        <column name="attribute_id"/>
        <column name="store_id"/>
    </index>

I work on fast database import scripts and tried to add a new unique index in that table:

    <table name="eav_attribute_label">
        <constraint xsi:type="unique" referenceId="EAV_ATTRIBUTE_LABEL_ATTRIBUTE_ID_STORE_ID_UNQ">
            <column name="attribute_id"/>
            <column name="store_id"/>
        </constraint>
    </table>

but unique index name create by Magento 2 is: EAV_ATTRIBUTE_LABEL_ATTRIBUTE_ID_STORE_ID which is identical to the index defined above and that breaks installation / running db:upgrade schema

Expected behavior (*)

Unique indexes should contain UNQ / UNIQUE in referenceId

Benefits

No conflicts on core tables when new indexes or unique indexes are added. Ability to create multiple insert scripts.

Additional information

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