Towers can now be explicitly assigned to a backbone by setting
backbone_code. This field is included in create/update DTOs and
the response. The backbone OSRM routing merges these tower waypoints
with Closure waypoints, sorted by distance from OTB-start.
Run once on DB: ALTER TABLE towers ADD COLUMN backbone_code VARCHAR(255);
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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