BUG-14: Patch poller was INSERT-ing a new row every poll cycle instead of
UPSERT-ing, creating 51 duplicate rows in host_patch_data for a single host.
Changes:
- patch_poller.rs: Changed INSERT to INSERT...ON CONFLICT (host_id) DO UPDATE
so each host only has one row that gets updated on each poll
- Migration 006: Added UNIQUE constraint on host_id, cleaned up 50 duplicate
rows keeping only the latest polled_at per host
The dashboard showing 174 pending patches and 0% compliance is expected
behavior - the patch data was collected before the job ran and the poller
runs every 30 minutes. The next poll cycle will refresh the data.
