Document current product backlog

docs/README.md

@@ -29,6 +29,7 @@ ausdrücklich getrennt und dürfen nicht als bereits implementiert verstanden we
 - [Projektversionen und externer Modellaustausch](project-history-and-external-model-architecture.md)
 - [Zukünftige Dimensionierung](spec/06-future-sizing-and-calculations.md)
 - [Roadmap und Phasen](spec/07-implementation-phases-todo.md)
+- [Aktueller Produkt-Backlog](spec/08-current-product-backlog.md)
 
 ## Fachliche Referenzspezifikation
 

docs/spec/08-current-product-backlog.md

@@ -0,0 +1,72 @@
+# 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.