Given the current state where application data is distributed across MongoDB (NoSQL/document store) and PostgreSQL (relational/SQL), we recommend a federated data governance model that respects each database's strengths while establishing unified governance controls. This approach balances centralized policy with decentralized implementation.
2. Guiding Principles
Database-Agnostic Policies: Define governance requirements independent of underlying technology
Proportional Controls: Implement controls based on data sensitivity, not database type
Unified Metadata Layer: Single source of truth for data lineage, classification, and ownership
Minimal Application Impact: Governance implementation should not require major application rewrites
3. Proposed Governance Framework
3.1 Organizational Structure
Data Governance Council (Strategic)
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Data Stewards (Business Domain Owners)
↓
Database Custodians (Technical Implementation)
↓
Data Consumers (Application Teams)