Fixes #20610: Correct VLAN ID range calculation logic #20611
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Fixes: #20610
Correct an off‑by‑one in
VLANGroup._total_vlan_ids
by computing lengths with half‑open[lo, hi)
semantics duringsave()
. Removes the+1
, adds a test and includes a data migration to backfill existing_total_vlan_ids
.No schema changes.