Adds AuditLogAppendOnlyGuardTests.cs to
tests/ZB.MOM.WW.ScadaBridge.ConfigurationDatabase.Tests/ — a code-level backstop
for the DB-role DENY UPDATE / DENY DELETE control established in migration
20260602174346_CollapseAuditLogToCanonical.
The guard scans every non-Designer, non-Snapshot *.cs file in the
ConfigurationDatabase source tree and fails the test run if any line matches the
DML-syntax pattern:
UPDATE\s+(?:dbo\.)?AuditLog\b
DELETE\s+(?:FROM\s+)?(?:dbo\.)?AuditLog\b
The tight DML-syntax pattern naturally excludes false positives without extra
exclusion checks: DENY UPDATE ON dbo.AuditLog is not matched (UPDATE is followed
by ON, not the table name); ALTER TABLE … SWITCH and TRUNCATE contain no UPDATE/
DELETE keyword; comments with UPDATE/AuditLog in separate clauses are not matched.
Self-verifying unit tests (ContainsAuditLogMutation_*) prove the helper:
- returns false on clean-source lines (INSERT, SELECT, DENY DDL, ALTER SWITCH,
TRUNCATE, DELETE FROM Notifications);
- returns TRUE on planted violations (UPDATE AuditLog SET …, DELETE FROM
dbo.AuditLog WHERE …, lower-case variants);
- returns false on the exact DENY/GRANT/partition-switch strings from the
production migration files.
All 256 ConfigurationDatabase.Tests pass; solution builds 0 W / 0 E.
Joseph Doherty