# Current Product Backlog

This document records the next agreed product improvements. It describes
requirements and intended sequencing, not proof of implementation.

## Circuit List Editor

- Open the ProjectDevice drawer on the right so it does not cover the leading
  circuit identifier and display-name columns.
- Format displayed power values in kW with at most three decimal places.
- Format displayed factors and percentage-like values with at most two decimal
  places.
- Do not round persisted values; formatting applies only to the displayed
  value outside edit mode.
- Replace the separate `Zeilensumme` and `Stromkreissumme` columns with one
  `Gesamtsumme` column:
  - device rows show their device-row total;
  - circuit summary rows show the complete circuit total;
  - compact single-device rows show the identical device/circuit total once.
- Collect the remaining editor interaction issues before changing additional
  behavior.

## Project History

- Every listed logical snapshot, including automatic snapshots, must be
  explicitly restorable from the project history UI.
- Show which project change produced a snapshot. Prefer immutable revision
  metadata over storing a second free-form description of the same change.
- Keep restoration auditable as a new project revision and preserve persistent
  undo/redo.

## Distribution Boards

- Assign an optional project floor to a distribution board.
- Store a supply classification for each distribution board:
  - `AV` (Allgemeine Stromversorgung)
  - `SV` (Sicherheitsstromversorgung)
  - `EV` (Ersatzstromversorgung)
  - `USV` (Unterbrechungsfreie Stromversorgung)
- Include both fields in project snapshots and portable project
  export/import.
- Persist changes through project commands so they remain undoable after a
  restart.

## Device Voltage Defaults

- Derive voltage from the selected phase type and the project settings:
  - single-phase uses the project's single-phase voltage;
  - three-phase uses the project's three-phase voltage.
- Apply this default consistently when creating global devices, project
  devices and manual circuit-list entries.
- Define explicit override behavior before implementation so a user-entered
  exceptional voltage is not silently overwritten when phase type or project
  settings change.

## Project Overview Import

- Add JSON project import to the project overview so a portable project file
  can create a new project without first opening another project.
- Keep replacement of an existing project inside that project's settings.
- Validate format version and checksum before creating project data.

## Recommended Sequence

1. Circuit-list presentation improvements.
2. Project-overview import as a new project.
3. Distribution-board floor and supply fields.
4. Device voltage default and override semantics.
5. Snapshot-to-revision descriptions and history presentation.

The Revit/CSV/IFCGUID round-trip remains a separate jointly planned phase and
must not be inferred from these tasks.