When namespace matching fails, the VMID-only fallback now checks whether
the VMID appears on multiple PVE instances. If ambiguous, the fallback
is skipped — preventing backups from being falsely attributed to the
wrong guest. Unique VMIDs still fall back as before.
The previous commit fixed namespace disambiguation for backup alerts,
but the Overview display uses SyncGuestBackupTimes to populate backup
timestamps on VMs/Containers. This commit extends the same namespace
matching logic to that function.
Also tightened the matching algorithm to use suffix matching instead
of substring matching, preventing false positives like "pve" matching
"pve-nat".
This resolves issues where snapshots/backups persist after deletion if the
Instance field didn't match the ID prefix (due to case changes, name changes, etc).
Now consistent with how VMs, Containers, Storage, etc. are filtered.
Also adds Instance field to BackupTask model for completeness.
Addresses #1009 (refs #991)
Previously, SyncGuestBackupTimes matched backups to guests using only VMID.
This caused newly created containers to incorrectly show old backup times
from different containers on other Proxmox instances that happened to have
the same VMID.
Now uses composite key (instance+VMID) for PVE storage backups to ensure
proper isolation. PBS backups still use VMID matching (since they aggregate
from multiple sources) but only as a fallback.
Fixes issue where ollama LXC showed 'last backup 3 months ago' despite
being created yesterday.
Add tests for the remaining uncovered State methods:
- SyncGuestBackupTimes: Tests backup time sync from storage and PBS backups
- UpdateStorageBackupsForInstance: Tests storage backup updates with instance isolation
Improves internal/models coverage from 89.6% to 95.6%.
