Third view on /tools/deployment-history. Where 'Gantt by Project' has
one row per project showing that project's deployments, 'Gantt by Unit'
inverts it — one row per seismograph, bars colored by the project the
unit was deployed to.
The natural use case: "where has BE11529 been across all my jobs?"
Spotting unit rotation patterns, idle gaps, and concurrent assignments
gets immediate visually.
Service
- deployment_history.get_deployment_history_data() now also returns a
`units` array. Each unit dict carries:
{id, bars[], first_active, assignment_count, any_active}
Each bar has the project_name + project_color baked in so the
renderer can paint by job without a second lookup.
- Units sorted: currently-active first, then by first_active ascending.
UI
- Third tab "Gantt by Unit" added next to Calendar / Gantt by Project.
- Tab switcher refactored to a small registry (_DH_TABS) so adding more
views in the future is a one-line addition.
- URL hash sync now supports #gantt and #byunit; nav buttons preserve
the active tab across month-paging.
- SVG layout: 160px label gutter (smaller than the project Gantt's
220px since unit IDs are short), 32px row height, green dot for
units with at least one active deployment. Unit ID is clickable
→ /unit/{id}; each bar is clickable → /projects/{p}.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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