Operators couldn't change a unit's assigned_at / assigned_until after
creating the assignment, so a unit physically deployed in December 2025
but only recorded in terra-view today would show "deployed today" and
all its real events would be invisible on the project's location page.
Backend:
- PATCH /api/projects/{project_id}/assignments/{assignment_id}
Accepts JSON body with optional assigned_at, assigned_until, notes.
- assigned_at is required (cannot be cleared)
- assigned_until can be null to mark active / indefinite
- assigned_until must be after assigned_at
- rejects overlaps with other assignments of the same unit at the
same location (different units overlapping is fine — that's a
legitimate swap window)
- assignment.status flips to "active" when assigned_until is cleared,
"completed" when set
- 404 if the assignment doesn't belong to {project_id} (security)
Frontend (vibration_location_detail.html):
- Pencil icon next to each row in the "Seismographs deployed at this
location" card. Click to open a modal with datetime-local inputs for
From + Until (blank = active) and a Notes textarea. Save reloads the
Events tab so KPI tiles and the event table reflect the new window.
- Helper line under the assignment list explains the workflow:
"Click the pencil to backdate a deployment so historical events get
attributed to this location."
Verified end-to-end against real data: backdating BE11529's assignment
on a vibration location from 2026-04-14 to 2025-12-01 surfaced 10
additional events (24 -> 34) that were previously invisible.
Validation suite (all returning correct HTTP codes):
- assigned_until < assigned_at -> 400
- cross-project assignment_id -> 404
- assigned_at cleared -> 400
- notes-only update -> 200
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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