`available-units` and `available-modems` now accept `include_benched=true`
to also return units/modems with `deployed=False`. Default is False so
the existing location-detail swap modal is unchanged. Each row carries
a `deployed` boolean for badge rendering. The Unit Swap wizard fetches
with the flag enabled — exactly the candidates a field tech pulls off
the shelf.
The /swap endpoint now flips the incoming unit (and modem) back to
`deployed=True` when they came in benched, keeping the legacy roster
flag consistent with the active-assignment signal.
Adds the symmetric half of the orphan-pairing fix: when a newly-paired
modem still claims a different seismograph (whose
`deployed_with_modem_id` was never cleared in a past swap), break that
stale back-reference before re-pairing.
`locations-with-assignments` includes `modem.deployed` so the wizard
can badge the current modem in the location card, the "Keep current
modem" choice, the picker rows, and the review screen.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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