ENG-3324: Monitor steward inheritance data model

[adamsachs]

Ticket ENG-3324

Description Of Changes

First step toward monitor stewardship inheritance. Adds data model support so that monitors can inherit stewards from their linked system(s) via sync.

Companion PR in fidesplus adds the API/schema layer. The background sync job that populates inherited rows is a separate ticket.

Code Changes

• Add inherit_system_stewards boolean column to MonitorConfig (default true for new monitors, backfilled false for existing)
• Extend MonitorSteward with source column (explicit/inherited, default explicit) and nullable source_system_id FK to ctl_systems
• Update unique constraint on monitorsteward from (user_id, monitor_config_id) to (user_id, monitor_config_id, source) — allows the same user to exist as both explicit and inherited
• Alembic migration with clean upgrade/downgrade (downgrade deletes inherited rows before restoring old constraint)

Steps to Confirm

1. Apply migration: verify monitorconfig.inherit_system_stewards column exists, existing rows have false, new inserts default to true
2. Verify monitorsteward table has source and source_system_id columns
3. Verify unique constraint allows same (user_id, monitor_config_id) pair with different source values
4. Run downgrade: verify inherited rows are cleaned up and old constraint is restored

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Issue Requirements are Met
• Optional: Follow-Up Issues Created

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
fides-plus-nightly	Ignored		Apr 10, 2026 1:17am
fides-privacy-center	Ignored		Apr 10, 2026 1:17am