ENG-2635: Standardize RDS & MySQL namespace meta field names

[JadeCara]

Ticket ENG-2635

Description Of Changes

Extend the existing alembic data migration (from PR #7500) to also rename namespace meta fields for rds_mysql and mysql connection types, and update the RDS MySQL connector to read the new field names.

PR #7500 renamed database_id → database_name and database_instance_id → database_instance_name on RDSPostgresNamespaceMeta but only migrated rds_postgres rows. This PR completes the migration for the remaining connection types:

• rds_mysql: renames both database_id → database_name and database_instance_id → database_instance_name
• mysql: renames database_id → database_name (no database_instance_id field)

Code Changes

• src/fides/api/alembic/migrations/versions/xx_..._rename_rds_namespace_meta_fields.py - Add upgrade/downgrade statements for rds_mysql and mysql connection types
• src/fides/api/service/connectors/rds_mysql_connector.py - Update namespace dict lookups from database_instance_id/database_id to database_instance_name/database_name

Steps to Confirm

1. Run alembic upgrade head — migration should apply cleanly including new rds_mysql and mysql statements
2. Run alembic downgrade <prev_rev> — downgrade should reverse all renames
3. Verify RDS MySQL connector reads database_instance_name and database_name from namespace meta

Pre-Merge Checklist

• Issue requirements met
• All CI pipelines succeeded
• CHANGELOG.md updated
  • Add a db-migration label to the entry if your change includes a DB migration
  • Add a high-risk label to the entry if your change includes a high-risk change
  • Updates unreleased work already in Changelog, no new entry necessary
• UX feedback:
  • No UX review needed
• Followup issues:
  • No followup issues
• Database migrations:
  • Ensure that your downrev is up to date with the latest revision on main
  • Ensure that your downgrade() migration is correct and works
• Documentation:
  • No documentation updates required

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
fides-plus-nightly	Ignored	Preview	Mar 6, 2026 9:02pm
fides-privacy-center	Ignored		Mar 6, 2026 9:02pm

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