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A practical architecture note for Magento custom modules: use etc/db_schema.xml for DDL, idempotent data patches for DML, and setup:upgrade as the single deployment path.
Declarative schema in Magento 2 replaces fragile upgrade scripts with a single source of truth in db_schema.xml. Here's how to add a column, backfill it with a Data Patch, and verify the result.
Replace legacy Install/Upgrade scripts with db_schema.xml: the minimal design, the whitelist trust boundary, operational checks, and the failure modes that bite in production.
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