# Current Product Backlog

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

## Circuit List Editor

- Collect the remaining editor interaction issues before changing additional
  behavior.

## Distribution Board Components and Protection Groups

- [x] Implement the agreed protected circuit-group and distribution-board
  component model in phased work packages.
- [x] Phase A: central protection catalog, validation, defaults and pure grouped
  BMK rules.
- [x] Phase B1: relational group, component and protection tables with shared
  BMK uniqueness.
- [x] Phase B2: complete snapshot/transfer schema for the supported project
  state.
- [x] Phase C1: new-board command with three groups and fixed header
  components.
- [x] Phase C2a1: persistent insert/delete commands for mutable group
  protection and auxiliary components.
- [x] Phase C2a2: component update and reorder commands.
- [x] Phase C2b1: empty-group insert/update/delete commands.
- [x] Phase C2b2: complete group reorder command.
- [x] Phase D1a: deterministic collision-aware group-renumber plan.
- [x] Phase D1b: persistent collision-safe group-renumber command.
- [x] Phase D2a: deterministic same-category circuit-move plan.
- [x] Phase D2b: persistent same-category circuit-move command.
- [x] Phase D3a: complete validated group-subtree snapshot and warning summary.
- [x] Phase D3b: persistent populated-group delete/restore command.
- [x] Phase E1: tree read model for components, groups and protection devices.
- [x] Phase E2a: pure header/group/footer structure projection.
- [x] Phase E2b: render the structure projection in the editor grid.
- [x] Phase E3a: create, edit and delete mutable group and footer components.
- [x] Phase E3b1: create, rename and safely delete empty circuit groups.
- [x] Phase E3b2a: persistent circuit-protection update command.
- [x] Phase E3b2b: circuit-protection defaults on insert and editor modal.
- [x] Phase E4a: persistent same-category group reorder controls.
- [x] Phase E4b: explicit group renumber, circuit moves and populated-delete warning.
  - [x] Explicit same-category group renumbering updates prefixes and all child BMK atomically.
  - [x] Single-circuit moves between same-category groups with automatic next-free BMK assignment.
  - [x] Populated-group delete warning and explicit subtree deletion.
- [x] Phase E: editor projection and editing.
- [x] Phase F: documentation and full GUI verification.
- [ ] Keep full electrical sizing and cable-dimensioning rules separate until
  the planner supplies the calculation requirements.
- Detailed specification:
  `docs/spec/09-distribution-board-components-and-protection-groups.md`

## First Release Baseline

The pre-release cleanup established the following compatibility boundary:

- [x] Pre-baseline databases, portable JSON exports, logical snapshots and
  persisted command histories are explicitly unsupported.
- [x] Migration `0000` builds the complete supported schema on an empty
  database.
- [x] The development migration chain and Drizzle metadata were replaced
  before any supported release depended on them.
- [x] Upgrade-only database, snapshot and command compatibility paths were
  removed.
- [x] Pre-cleanup development history remains available through Git history.
- [x] Clean installation, migration, startup and core workflows were verified
  against an empty database.
- [ ] Mark this compatibility boundary with the first supported release tag.
- After that release, every published migration is immutable and later schema
  changes must use new additive migrations.

## Project History

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

## Distribution Boards

- [x] Assign an optional project floor to a distribution board.
- [x] Store a supply classification for each distribution board:
  - `AV` (Allgemeine Stromversorgung)
  - `SV` (Sicherheitsstromversorgung)
  - `EV` (Ersatzstromversorgung)
  - `USV` (Unterbrechungsfreie Stromversorgung)
  - `MSR` (Mess-, Steuerungs- und Regelungstechnik)
  - `SiBe` (Sicherheitsbeleuchtung)
- [x] Let project settings select which catalog supply types are used in a
  project. Distribution-board dialogs offer only that selection; a type in
  use cannot be disabled.
- [x] Include both fields in project snapshots and portable project
  export/import.
- [x] Persist changes through project commands so they remain undoable after a
  restart.

## Device Voltage Derivation

- [x] 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.
- [x] Voltage is not editable on global devices, project devices or circuits.
  Global devices store only their phase; copying one into a project derives
  the target project's voltage.
- [x] Project-device voltage follows its phase. Circuit voltage follows the
  section phase; an unassigned circuit is three-phase only when all assigned
  device rows with a valid phase are three-phase.
- [x] Changing project voltage settings updates all project devices and circuits
  atomically in the same persistent Undo/Redo step.
- [x] Baseline migration `0000` stores only canonical derived values.
  Pre-baseline imports are intentionally unsupported.

## Building Classification

- [x] Store whether a project represents a public building.
- [x] Edit the value in the project settings and preserve it through persistent
  Undo/Redo, snapshots and portable project transfers.
- [x] Provide the value as an explicit future sizing input for selecting
  halogen-free cables and lines; automatic sizing remains deferred.

## Circuit List Power Summary

- [x] Show the total power of every circuit section.
- [x] Show the unadjusted total power of the complete distribution board.
- [x] Store a distribution-board simultaneity factor between zero and one in
  the distribution-board settings.
- [x] Show the distribution-board total after applying that factor.
- [x] Preserve the factor in project commands, snapshots and portable project
  transfers.
- [x] Keep column visibility and order as a project-specific UI preference so
  all distribution boards in the same project open with the same columns.

## Recommended Sequence

1. [x] Distribution-board floor and supply fields.
2. [x] Device voltage derivation without overrides.
3. [x] Snapshot-to-revision descriptions and history presentation.
4. [x] Distribution-board power summary and project column layout.

The Revit/CSV/IFCGUID round-trip follows the distribution-board component
foundation as a separate jointly planned phase and must not be inferred from
these tasks.