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Continue to ChatCreate Unique Key Column in db_schema.xml file Magento 2. https://www.rakeshjesadiya.com/create-unique-key-column-in-db_schema-xml-file-magento-2/
Create Unique Key Column in db_schema.xml file Magento 2. https://www.rakeshjesadiya.com/create-unique-key-column-in-db_schema-xml-file-magento-2/