Defense-in-Depth

When to Use

• After fixing any data-related bug
• Protecting critical data paths
• Preventing bug recurrence
• Building robust systems
• When single validation points have failed

When NOT to Use

• Greenfield prototyping where speed matters more than robustness and requirements are still fluid
• Non-data-related bugs such as logic errors, race conditions, or algorithmic mistakes
• UI styling issues where visual correctness is the concern, not data integrity

Core Concept