Audit Trail Architecture: Moving Beyond Database-Backed Logging

Database audit logs have a fatal structural flaw: the same application code that writes audit records can also modify them, making them mutable rather than immutable—a vulnerability auditors will immediately challenge. In regulated industries like fintech and healthcare, this gap between perceived immutability and actual mutable history creates serious compliance risk. This guide reveals how to architect truly immutable audit systems using file-based append-only logs with request ID correlation that auditors actually trust.