DB review found four DateTime columns defaulting to db.func.now() (MySQL
session-timezone wall clock) while the rest of the schema stores naive UTC, so
one schema mixed two clocks and to_dict() labelled the local values UTC with a
'Z' suffix. Switch application.dateadded, computers.installeddate,
knowledgebase.lastupdated (default + onupdate), and slides.uploadeddate to the
module-level naive-UTC _utcnow callable already used elsewhere (apitoken.py).
ORM-side default only - no column-type change, no data migration; affects
new/updated rows.
Targeted tests pass (154); naming + pyflakes green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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