W-03: Unify split transactions — _create_db_session() now uses flush()
instead of commit(), callers own the final commit.
W-04: Time-bound dedup key fetch to 7-day purge window.
S-01: Type admin dashboard response with RecentLoginItem/RecentAuditItem.
S-02: Convert starred events index to partial index WHERE is_starred = true.
S-03: EventTemplate.created_at default changed to func.now() for consistency.
S-04: Add single-worker scaling note to weather cache.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Remove unused imports (UserCheck, Loader2, ShieldOff) and replace
non-existent SmartphoneOff icon with Smartphone in admin components.
Includes backend query fixes, performance indexes migration, and
admin page shared utilities extraction.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
