Phase 1A done

package.json

@@ -11,8 +11,8 @@
     "build:api": "tsc -p tsconfig.json",
     "build:web": "next build",
     "start": "node dist/server/index.js",
-    "test": "tsx --test tests/power-calculation.test.ts tests/consumer-linking.service.test.ts tests/consumer-schema-options.test.ts",
+    "test": "tsx --test tests/power-calculation.test.ts tests/consumer-linking.service.test.ts tests/consumer-schema-options.test.ts tests/legacy-consumer-migration-planner.test.ts",
-    "test:watch": "tsx --watch --test tests/power-calculation.test.ts tests/consumer-linking.service.test.ts tests/consumer-schema-options.test.ts",
+    "test:watch": "tsx --watch --test tests/power-calculation.test.ts tests/consumer-linking.service.test.ts tests/consumer-schema-options.test.ts tests/legacy-consumer-migration-planner.test.ts",
     "db:generate": "drizzle-kit generate",
     "db:migrate": "drizzle-kit migrate"
   },

src/db/migrations/0008_circuit_first_model.sql

@@ -0,0 +1,99 @@
+CREATE TABLE `circuit_sections` (
+	`id` text PRIMARY KEY NOT NULL,
+	`circuit_list_id` text NOT NULL,
+	`key` text NOT NULL,
+	`display_name` text NOT NULL,
+	`prefix` text NOT NULL,
+	`sort_order` integer NOT NULL DEFAULT 0,
+	FOREIGN KEY (`circuit_list_id`) REFERENCES `circuit_lists`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `circuit_sections_list_key_unique` ON `circuit_sections` (`circuit_list_id`,`key`);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `circuit_sections_list_prefix_unique` ON `circuit_sections` (`circuit_list_id`,`prefix`);
+--> statement-breakpoint
+
+CREATE TABLE `circuits` (
+	`id` text PRIMARY KEY NOT NULL,
+	`circuit_list_id` text NOT NULL,
+	`section_id` text NOT NULL,
+	`equipment_identifier` text NOT NULL,
+	`display_name` text,
+	`sort_order` integer NOT NULL DEFAULT 0,
+	`protection_type` text,
+	`protection_rated_current` real,
+	`protection_characteristic` text,
+	`cable_type` text,
+	`cable_cross_section` text,
+	`cable_length` real,
+	`rcd_assignment` text,
+	`terminal_designation` text,
+	`voltage` real,
+	`status` text,
+	`is_reserve` integer NOT NULL DEFAULT 0,
+	`remark` text,
+	FOREIGN KEY (`circuit_list_id`) REFERENCES `circuit_lists`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`section_id`) REFERENCES `circuit_sections`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `circuits_list_equipment_identifier_unique` ON `circuits` (`circuit_list_id`,`equipment_identifier`);
+--> statement-breakpoint
+
+CREATE TABLE `circuit_device_rows` (
+	`id` text PRIMARY KEY NOT NULL,
+	`circuit_id` text NOT NULL,
+	`linked_project_device_id` text,
+	`legacy_consumer_id` text,
+	`sort_order` integer NOT NULL DEFAULT 0,
+	`name` text NOT NULL,
+	`display_name` text NOT NULL,
+	`phase_type` text,
+	`connection_kind` text,
+	`cost_group` text,
+	`category` text,
+	`level` text,
+	`room_id` text,
+	`room_number_snapshot` text,
+	`room_name_snapshot` text,
+	`quantity` integer NOT NULL,
+	`power_per_unit` real NOT NULL,
+	`simultaneity_factor` real NOT NULL,
+	`cos_phi` real,
+	`remark` text,
+	`overridden_fields` text,
+	FOREIGN KEY (`circuit_id`) REFERENCES `circuits`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`linked_project_device_id`) REFERENCES `project_devices`(`id`) ON UPDATE no action ON DELETE set null,
+	FOREIGN KEY (`room_id`) REFERENCES `rooms`(`id`) ON UPDATE no action ON DELETE set null
+);
+--> statement-breakpoint
+
+CREATE TABLE `legacy_consumer_circuit_migrations` (
+	`consumer_id` text PRIMARY KEY NOT NULL,
+	`circuit_id` text NOT NULL,
+	`circuit_device_row_id` text NOT NULL,
+	`circuit_list_id` text NOT NULL,
+	`created_at_iso` text NOT NULL,
+	FOREIGN KEY (`circuit_id`) REFERENCES `circuits`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`circuit_device_row_id`) REFERENCES `circuit_device_rows`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`circuit_list_id`) REFERENCES `circuit_lists`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+
+CREATE TABLE `legacy_consumer_migration_reports` (
+	`id` text PRIMARY KEY NOT NULL,
+	`circuit_list_id` text NOT NULL,
+	`legacy_consumer_count` integer NOT NULL,
+	`created_circuit_count` integer NOT NULL,
+	`created_device_row_count` integer NOT NULL,
+	`duplicate_grouped_count` integer NOT NULL,
+	`generated_identifier_count` integer NOT NULL,
+	`unassigned_row_count` integer NOT NULL,
+	`warnings_json` text NOT NULL,
+	`generated_identifiers_json` text NOT NULL,
+	`duplicate_groups_json` text NOT NULL,
+	`created_at_iso` text NOT NULL,
+	FOREIGN KEY (`circuit_list_id`) REFERENCES `circuit_lists`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `legacy_consumer_migration_reports_list_unique` ON `legacy_consumer_migration_reports` (`circuit_list_id`);
+

src/db/repositories/circuit-device-row.repository.ts

@@ -0,0 +1,61 @@
+import crypto from "node:crypto";
+import { asc, inArray } from "drizzle-orm";
+import { db } from "../client.js";
+import { circuitDeviceRows } from "../schema/circuit-device-rows.js";
+
+export class CircuitDeviceRowRepository {
+  async listByCircuitList(circuitIds: string[]) {
+    if (!circuitIds.length) {
+      return [];
+    }
+    return db
+      .select()
+      .from(circuitDeviceRows)
+      .where(inArray(circuitDeviceRows.circuitId, circuitIds))
+      .orderBy(asc(circuitDeviceRows.sortOrder));
+  }
+
+  async create(input: {
+    circuitId: string;
+    linkedProjectDeviceId?: string;
+    legacyConsumerId?: string;
+    sortOrder: number;
+    name: string;
+    displayName: string;
+    phaseType?: string;
+    connectionKind?: string;
+    costGroup?: string;
+    category?: string;
+    roomId?: string;
+    roomNumberSnapshot?: string;
+    roomNameSnapshot?: string;
+    quantity: number;
+    powerPerUnit: number;
+    simultaneityFactor: number;
+    cosPhi?: number;
+    remark?: string;
+  }) {
+    await db.insert(circuitDeviceRows).values({
+      id: crypto.randomUUID(),
+      circuitId: input.circuitId,
+      linkedProjectDeviceId: input.linkedProjectDeviceId ?? null,
+      legacyConsumerId: input.legacyConsumerId ?? null,
+      sortOrder: input.sortOrder,
+      name: input.name,
+      displayName: input.displayName,
+      phaseType: input.phaseType ?? null,
+      connectionKind: input.connectionKind ?? null,
+      costGroup: input.costGroup ?? null,
+      category: input.category ?? null,
+      roomId: input.roomId ?? null,
+      roomNumberSnapshot: input.roomNumberSnapshot ?? null,
+      roomNameSnapshot: input.roomNameSnapshot ?? null,
+      quantity: input.quantity,
+      powerPerUnit: input.powerPerUnit,
+      simultaneityFactor: input.simultaneityFactor,
+      cosPhi: input.cosPhi ?? null,
+      remark: input.remark ?? null,
+      overriddenFields: null,
+    });
+  }
+}

src/db/repositories/circuit-section.repository.ts

@@ -0,0 +1,42 @@
+import crypto from "node:crypto";
+import { and, asc, eq } from "drizzle-orm";
+import { db } from "../client.js";
+import { circuitSections } from "../schema/circuit-sections.js";
+
+export class CircuitSectionRepository {
+  async listByCircuitList(circuitListId: string) {
+    return db
+      .select()
+      .from(circuitSections)
+      .where(eq(circuitSections.circuitListId, circuitListId))
+      .orderBy(asc(circuitSections.sortOrder));
+  }
+
+  async createDefaults(circuitListId: string) {
+    const defaults = [
+      { key: "lighting", displayName: "Lighting", prefix: "-1F", sortOrder: 10 },
+      { key: "single_phase", displayName: "Single-phase circuits", prefix: "-2F", sortOrder: 20 },
+      { key: "three_phase", displayName: "Three-phase circuits", prefix: "-3F", sortOrder: 30 },
+      { key: "unassigned", displayName: "Unassigned", prefix: "-UF", sortOrder: 90 },
+    ];
+
+    for (const entry of defaults) {
+      const existing = await db
+        .select({ id: circuitSections.id })
+        .from(circuitSections)
+        .where(
+          and(eq(circuitSections.circuitListId, circuitListId), eq(circuitSections.key, entry.key))
+        )
+        .limit(1);
+      if (existing.length) {
+        continue;
+      }
+      await db.insert(circuitSections).values({
+        id: crypto.randomUUID(),
+        circuitListId,
+        ...entry,
+      });
+    }
+  }
+}
+

src/db/repositories/circuit.repository.ts

@@ -0,0 +1,50 @@
+import crypto from "node:crypto";
+import { asc, eq } from "drizzle-orm";
+import { db } from "../client.js";
+import { circuits } from "../schema/circuits.js";
+
+export class CircuitRepository {
+  async listByCircuitList(circuitListId: string) {
+    return db
+      .select()
+      .from(circuits)
+      .where(eq(circuits.circuitListId, circuitListId))
+      .orderBy(asc(circuits.sortOrder), asc(circuits.equipmentIdentifier));
+  }
+
+  async create(input: {
+    circuitListId: string;
+    sectionId: string;
+    equipmentIdentifier: string;
+    displayName?: string;
+    sortOrder: number;
+    protectionType?: string;
+    protectionRatedCurrent?: number;
+    protectionCharacteristic?: string;
+    cableType?: string;
+    cableCrossSection?: string;
+    cableLength?: number;
+    voltage?: number;
+    remark?: string;
+  }) {
+    const id = crypto.randomUUID();
+    await db.insert(circuits).values({
+      id,
+      circuitListId: input.circuitListId,
+      sectionId: input.sectionId,
+      equipmentIdentifier: input.equipmentIdentifier,
+      displayName: input.displayName ?? null,
+      sortOrder: input.sortOrder,
+      protectionType: input.protectionType ?? null,
+      protectionRatedCurrent: input.protectionRatedCurrent ?? null,
+      protectionCharacteristic: input.protectionCharacteristic ?? null,
+      cableType: input.cableType ?? null,
+      cableCrossSection: input.cableCrossSection ?? null,
+      cableLength: input.cableLength ?? null,
+      voltage: input.voltage ?? null,
+      remark: input.remark ?? null,
+    });
+    return id;
+  }
+}
+

src/db/repositories/consumer.repository.ts

@@ -12,6 +12,10 @@ export class ConsumerRepository {
     return db.select().from(consumers).where(eq(consumers.projectId, projectId));
   }
 
+  async listByCircuitList(circuitListId: string) {
+    return db.select().from(consumers).where(eq(consumers.circuitListId, circuitListId));
+  }
+
   async create(input: CreateConsumerInput) {
     const id = crypto.randomUUID();
     const normalizedName = input.name?.trim() || "Unbenannter Eintrag";

src/db/schema/circuit-device-rows.ts

@@ -0,0 +1,35 @@
+import { integer, real, sqliteTable, text } from "drizzle-orm/sqlite-core";
+import { circuits } from "./circuits.js";
+import { projectDevices } from "./project-devices.js";
+import { rooms } from "./rooms.js";
+
+export const circuitDeviceRows = sqliteTable("circuit_device_rows", {
+  id: text("id").primaryKey(),
+  circuitId: text("circuit_id")
+    .notNull()
+    .references(() => circuits.id, { onDelete: "cascade" }),
+  linkedProjectDeviceId: text("linked_project_device_id").references(() => projectDevices.id, {
+    onDelete: "set null",
+  }),
+  legacyConsumerId: text("legacy_consumer_id"),
+  sortOrder: integer("sort_order").notNull().default(0),
+  name: text("name").notNull(),
+  displayName: text("display_name").notNull(),
+  phaseType: text("phase_type"),
+  connectionKind: text("connection_kind"),
+  costGroup: text("cost_group"),
+  category: text("category"),
+  level: text("level"),
+  roomId: text("room_id").references(() => rooms.id, {
+    onDelete: "set null",
+  }),
+  roomNumberSnapshot: text("room_number_snapshot"),
+  roomNameSnapshot: text("room_name_snapshot"),
+  quantity: integer("quantity").notNull(),
+  powerPerUnit: real("power_per_unit").notNull(),
+  simultaneityFactor: real("simultaneity_factor").notNull(),
+  cosPhi: real("cos_phi"),
+  remark: text("remark"),
+  overriddenFields: text("overridden_fields"),
+});
+

src/db/schema/circuit-sections.ts

@@ -0,0 +1,21 @@
+import { integer, sqliteTable, text, unique } from "drizzle-orm/sqlite-core";
+import { circuitLists } from "./circuit-lists.js";
+
+export const circuitSections = sqliteTable(
+  "circuit_sections",
+  {
+    id: text("id").primaryKey(),
+    circuitListId: text("circuit_list_id")
+      .notNull()
+      .references(() => circuitLists.id, { onDelete: "cascade" }),
+    key: text("key").notNull(),
+    displayName: text("display_name").notNull(),
+    prefix: text("prefix").notNull(),
+    sortOrder: integer("sort_order").notNull().default(0),
+  },
+  (table) => [
+    unique("circuit_sections_list_key_unique").on(table.circuitListId, table.key),
+    unique("circuit_sections_list_prefix_unique").on(table.circuitListId, table.prefix),
+  ]
+);
+

src/db/schema/circuits.ts

@@ -0,0 +1,33 @@
+import { integer, real, sqliteTable, text, unique } from "drizzle-orm/sqlite-core";
+import { circuitLists } from "./circuit-lists.js";
+import { circuitSections } from "./circuit-sections.js";
+
+export const circuits = sqliteTable(
+  "circuits",
+  {
+    id: text("id").primaryKey(),
+    circuitListId: text("circuit_list_id")
+      .notNull()
+      .references(() => circuitLists.id, { onDelete: "cascade" }),
+    sectionId: text("section_id")
+      .notNull()
+      .references(() => circuitSections.id, { onDelete: "cascade" }),
+    equipmentIdentifier: text("equipment_identifier").notNull(),
+    displayName: text("display_name"),
+    sortOrder: integer("sort_order").notNull().default(0),
+    protectionType: text("protection_type"),
+    protectionRatedCurrent: real("protection_rated_current"),
+    protectionCharacteristic: text("protection_characteristic"),
+    cableType: text("cable_type"),
+    cableCrossSection: text("cable_cross_section"),
+    cableLength: real("cable_length"),
+    rcdAssignment: text("rcd_assignment"),
+    terminalDesignation: text("terminal_designation"),
+    voltage: real("voltage"),
+    status: text("status"),
+    isReserve: integer("is_reserve").notNull().default(0),
+    remark: text("remark"),
+  },
+  (table) => [unique("circuits_list_equipment_identifier_unique").on(table.circuitListId, table.equipmentIdentifier)]
+);
+

src/db/schema/legacy-consumer-circuit-migrations.ts

@@ -0,0 +1,19 @@
+import { sqliteTable, text } from "drizzle-orm/sqlite-core";
+import { circuitDeviceRows } from "./circuit-device-rows.js";
+import { circuitLists } from "./circuit-lists.js";
+import { circuits } from "./circuits.js";
+
+export const legacyConsumerCircuitMigrations = sqliteTable("legacy_consumer_circuit_migrations", {
+  consumerId: text("consumer_id").primaryKey(),
+  circuitId: text("circuit_id")
+    .notNull()
+    .references(() => circuits.id, { onDelete: "cascade" }),
+  circuitDeviceRowId: text("circuit_device_row_id")
+    .notNull()
+    .references(() => circuitDeviceRows.id, { onDelete: "cascade" }),
+  circuitListId: text("circuit_list_id")
+    .notNull()
+    .references(() => circuitLists.id, { onDelete: "cascade" }),
+  createdAtIso: text("created_at_iso").notNull(),
+});
+

src/db/schema/legacy-consumer-migration-report.ts

@@ -0,0 +1,24 @@
+import { integer, sqliteTable, text, unique } from "drizzle-orm/sqlite-core";
+import { circuitLists } from "./circuit-lists.js";
+
+export const legacyConsumerMigrationReports = sqliteTable(
+  "legacy_consumer_migration_reports",
+  {
+    id: text("id").primaryKey(),
+    circuitListId: text("circuit_list_id")
+      .notNull()
+      .references(() => circuitLists.id, { onDelete: "cascade" }),
+    legacyConsumerCount: integer("legacy_consumer_count").notNull(),
+    createdCircuitCount: integer("created_circuit_count").notNull(),
+    createdDeviceRowCount: integer("created_device_row_count").notNull(),
+    duplicateGroupedCount: integer("duplicate_grouped_count").notNull(),
+    generatedIdentifierCount: integer("generated_identifier_count").notNull(),
+    unassignedRowCount: integer("unassigned_row_count").notNull(),
+    warningsJson: text("warnings_json").notNull(),
+    generatedIdentifiersJson: text("generated_identifiers_json").notNull(),
+    duplicateGroupsJson: text("duplicate_groups_json").notNull(),
+    createdAtIso: text("created_at_iso").notNull(),
+  },
+  (table) => [unique("legacy_consumer_migration_reports_list_unique").on(table.circuitListId)]
+);
+

src/domain/models/circuit-device-row.model.ts

@@ -0,0 +1,24 @@
+export interface CircuitDeviceRow {
+  id: string;
+  circuitId: string;
+  linkedProjectDeviceId?: string;
+  legacyConsumerId?: string;
+  sortOrder: number;
+  name: string;
+  displayName: string;
+  phaseType?: string;
+  connectionKind?: string;
+  costGroup?: string;
+  category?: string;
+  level?: string;
+  roomId?: string;
+  roomNumberSnapshot?: string;
+  roomNameSnapshot?: string;
+  quantity: number;
+  powerPerUnit: number;
+  simultaneityFactor: number;
+  cosPhi?: number;
+  remark?: string;
+  overriddenFields?: string;
+}
+

src/domain/models/circuit-section.model.ts

@@ -0,0 +1,9 @@
+export interface CircuitSection {
+  id: string;
+  circuitListId: string;
+  key: string;
+  displayName: string;
+  prefix: string;
+  sortOrder: number;
+}
+

src/domain/models/circuit-tree.model.ts

@@ -0,0 +1,72 @@
+export interface CircuitTreeDeviceRow {
+  id: string;
+  linkedProjectDeviceId?: string;
+  legacyConsumerId?: string;
+  sortOrder: number;
+  name: string;
+  displayName: string;
+  phaseType?: string;
+  connectionKind?: string;
+  costGroup?: string;
+  category?: string;
+  level?: string;
+  roomId?: string;
+  roomNumberSnapshot?: string;
+  roomNameSnapshot?: string;
+  quantity: number;
+  powerPerUnit: number;
+  simultaneityFactor: number;
+  cosPhi?: number;
+  remark?: string;
+  overriddenFields?: string;
+  rowTotalPower: number;
+}
+
+export interface CircuitTreeCircuit {
+  id: string;
+  circuitListId: string;
+  sectionId: string;
+  equipmentIdentifier: string;
+  displayName?: string;
+  sortOrder: number;
+  protectionType?: string;
+  protectionRatedCurrent?: number;
+  protectionCharacteristic?: string;
+  cableType?: string;
+  cableCrossSection?: string;
+  cableLength?: number;
+  rcdAssignment?: string;
+  terminalDesignation?: string;
+  voltage?: number;
+  status?: string;
+  isReserve: boolean;
+  remark?: string;
+  circuitTotalPower: number;
+  deviceRows: CircuitTreeDeviceRow[];
+}
+
+export interface CircuitTreeSectionBlock {
+  id: string;
+  key: string;
+  displayName: string;
+  prefix: string;
+  sortOrder: number;
+  circuits: CircuitTreeCircuit[];
+}
+
+export interface CircuitTreeResponse {
+  circuitListId: string;
+  sections: CircuitTreeSectionBlock[];
+}
+
+export interface LegacyMigrationReport {
+  circuitListId: string;
+  legacyConsumerCount: number;
+  createdCircuitCount: number;
+  createdDeviceRowCount: number;
+  groupedDuplicateCircuitNumbers: Array<{ normalizedCircuitNumber: string; count: number }>;
+  generatedIdentifiers: string[];
+  unassignedRows: Array<{ consumerId: string; reason: string }>;
+  warnings: string[];
+}
+

src/domain/models/circuit.model.ts

@@ -0,0 +1,21 @@
+export interface Circuit {
+  id: string;
+  circuitListId: string;
+  sectionId: string;
+  equipmentIdentifier: string;
+  displayName?: string;
+  sortOrder: number;
+  protectionType?: string;
+  protectionRatedCurrent?: number;
+  protectionCharacteristic?: string;
+  cableType?: string;
+  cableCrossSection?: string;
+  cableLength?: number;
+  rcdAssignment?: string;
+  terminalDesignation?: string;
+  voltage?: number;
+  status?: string;
+  isReserve: boolean;
+  remark?: string;
+}
+

src/domain/services/legacy-consumer-migration-planner.ts

@@ -0,0 +1,57 @@
+export interface LegacyConsumerForPlanning {
+  id: string;
+  circuitNumber: string | null;
+  category: string | null;
+  phaseType: string | null;
+  phaseCount: number | null;
+}
+
+export function normalizeCircuitNumber(value: string | null): string | null {
+  if (!value) {
+    return null;
+  }
+  const trimmed = value.trim().toUpperCase();
+  if (!trimmed) {
+    return null;
+  }
+  if (!/^-\d+F\d+$/.test(trimmed)) {
+    return null;
+  }
+  return trimmed;
+}
+
+export function inferSectionKeyFromLegacyInput(consumer: LegacyConsumerForPlanning): string | null {
+  const category = (consumer.category ?? "").toLowerCase();
+  if (category.includes("light") || category.includes("beleuchtung")) {
+    return "lighting";
+  }
+  if (consumer.phaseCount === 3) {
+    return "three_phase";
+  }
+  if (consumer.phaseCount === 1) {
+    return "single_phase";
+  }
+
+  const phaseType = (consumer.phaseType ?? "").toLowerCase();
+  if (phaseType.includes("three") || phaseType.includes("3")) {
+    return "three_phase";
+  }
+  if (phaseType.includes("single") || phaseType.includes("1")) {
+    return "single_phase";
+  }
+  return null;
+}
+
+export function inferSectionKeyFromEquipmentIdentifier(equipmentIdentifier: string): string | null {
+  if (equipmentIdentifier.startsWith("-1F")) {
+    return "lighting";
+  }
+  if (equipmentIdentifier.startsWith("-2F")) {
+    return "single_phase";
+  }
+  if (equipmentIdentifier.startsWith("-3F")) {
+    return "three_phase";
+  }
+  return null;
+}
+

src/domain/services/legacy-consumer-migration.service.ts

@@ -0,0 +1,289 @@
+import crypto from "node:crypto";
+import { and, eq } from "drizzle-orm";
+import { db } from "../../db/client.js";
+import { CircuitRepository } from "../../db/repositories/circuit.repository.js";
+import { CircuitDeviceRowRepository } from "../../db/repositories/circuit-device-row.repository.js";
+import { CircuitListRepository } from "../../db/repositories/circuit-list.repository.js";
+import { CircuitSectionRepository } from "../../db/repositories/circuit-section.repository.js";
+import { ConsumerRepository } from "../../db/repositories/consumer.repository.js";
+import { RoomRepository } from "../../db/repositories/room.repository.js";
+import { circuitDeviceRows } from "../../db/schema/circuit-device-rows.js";
+import { legacyConsumerCircuitMigrations } from "../../db/schema/legacy-consumer-circuit-migrations.js";
+import { legacyConsumerMigrationReports } from "../../db/schema/legacy-consumer-migration-report.js";
+import type { LegacyMigrationReport } from "../models/circuit-tree.model.js";
+import {
+  inferSectionKeyFromEquipmentIdentifier,
+  inferSectionKeyFromLegacyInput,
+  normalizeCircuitNumber,
+} from "./legacy-consumer-migration-planner.js";
+
+type LegacyConsumerRow = Awaited<ReturnType<ConsumerRepository["listByCircuitList"]>>[number];
+
+function parseEquipmentSequence(equipmentIdentifier: string, prefix: string): number | null {
+  if (!equipmentIdentifier.startsWith(prefix)) {
+    return null;
+  }
+  const suffix = equipmentIdentifier.slice(prefix.length);
+  if (!/^\d+$/.test(suffix)) {
+    return null;
+  }
+  return Number(suffix);
+}
+
+
+export class LegacyConsumerMigrationService {
+  private readonly circuitListRepository = new CircuitListRepository();
+  private readonly sectionRepository = new CircuitSectionRepository();
+  private readonly circuitRepository = new CircuitRepository();
+  private readonly circuitDeviceRowRepository = new CircuitDeviceRowRepository();
+  private readonly consumerRepository = new ConsumerRepository();
+  private readonly roomRepository = new RoomRepository();
+
+  async migrateCircuitList(projectId: string, circuitListId: string): Promise<LegacyMigrationReport> {
+    const list = await this.circuitListRepository.findById(projectId, circuitListId);
+    if (!list) {
+      throw new Error("Circuit list not found in project.");
+    }
+
+    await this.sectionRepository.createDefaults(circuitListId);
+    const sections = await this.sectionRepository.listByCircuitList(circuitListId);
+    const sectionByKey = new Map(sections.map((section) => [section.key, section]));
+    const unassignedSection = sectionByKey.get("unassigned");
+    if (!unassignedSection) {
+      throw new Error("Unassigned section is required.");
+    }
+
+    const existingCircuits = await this.circuitRepository.listByCircuitList(circuitListId);
+    const usedEquipmentIdentifiers = new Set(
+      existingCircuits.map((circuit) => circuit.equipmentIdentifier.toUpperCase())
+    );
+
+    const legacyConsumers = await this.consumerRepository.listByCircuitList(circuitListId);
+    const rooms = await this.roomRepository.listByProject(projectId);
+    const roomById = new Map(rooms.map((room) => [room.id, room]));
+
+    const report: LegacyMigrationReport = {
+      circuitListId,
+      legacyConsumerCount: legacyConsumers.length,
+      createdCircuitCount: 0,
+      createdDeviceRowCount: 0,
+      groupedDuplicateCircuitNumbers: [],
+      generatedIdentifiers: [],
+      unassignedRows: [],
+      warnings: [],
+    };
+
+    const migratedRows = await db
+      .select({ consumerId: legacyConsumerCircuitMigrations.consumerId })
+      .from(legacyConsumerCircuitMigrations)
+      .where(eq(legacyConsumerCircuitMigrations.circuitListId, circuitListId));
+    const migratedConsumerIds = new Set(migratedRows.map((row) => row.consumerId));
+    const consumersToMigrate = legacyConsumers.filter((consumer) => !migratedConsumerIds.has(consumer.id));
+
+    const byNormalizedCircuitNumber = new Map<string, LegacyConsumerRow[]>();
+    const withoutNormalizedCircuitNumber: LegacyConsumerRow[] = [];
+    for (const consumer of consumersToMigrate) {
+      const normalized = normalizeCircuitNumber(consumer.circuitNumber ?? null);
+      if (!normalized) {
+        withoutNormalizedCircuitNumber.push(consumer);
+        continue;
+      }
+      if (!byNormalizedCircuitNumber.has(normalized)) {
+        byNormalizedCircuitNumber.set(normalized, []);
+      }
+      byNormalizedCircuitNumber.get(normalized)!.push(consumer);
+    }
+
+    report.groupedDuplicateCircuitNumbers = [...byNormalizedCircuitNumber.entries()]
+      .filter(([, grouped]) => grouped.length > 1)
+      .map(([normalizedCircuitNumber, grouped]) => ({ normalizedCircuitNumber, count: grouped.length }));
+
+    const groups: Array<{
+      equipmentIdentifier: string | null;
+      consumers: LegacyConsumerRow[];
+      inferredSectionKey: string | null;
+      isGeneratedIdentifier: boolean;
+    }> = [];
+
+    for (const [normalizedCircuitNumber, grouped] of byNormalizedCircuitNumber.entries()) {
+      groups.push({
+        equipmentIdentifier: normalizedCircuitNumber,
+        consumers: grouped,
+        inferredSectionKey: inferSectionKeyFromEquipmentIdentifier(normalizedCircuitNumber),
+        isGeneratedIdentifier: false,
+      });
+    }
+
+    for (const consumer of withoutNormalizedCircuitNumber) {
+      groups.push({
+        equipmentIdentifier: null,
+        consumers: [consumer],
+        inferredSectionKey: inferSectionKeyFromLegacyInput(consumer),
+        isGeneratedIdentifier: true,
+      });
+    }
+
+    let nextSortOrder = existingCircuits.length ? Math.max(...existingCircuits.map((circuit) => circuit.sortOrder)) + 10 : 10;
+
+    const maxBySectionPrefix = new Map<string, number>();
+    for (const circuit of existingCircuits) {
+      const section = sections.find((entry) => entry.id === circuit.sectionId);
+      if (!section) {
+        continue;
+      }
+      const sequence = parseEquipmentSequence(circuit.equipmentIdentifier.toUpperCase(), section.prefix.toUpperCase());
+      if (sequence === null) {
+        continue;
+      }
+      const current = maxBySectionPrefix.get(section.prefix.toUpperCase()) ?? 0;
+      maxBySectionPrefix.set(section.prefix.toUpperCase(), Math.max(current, sequence));
+    }
+
+    for (const group of groups) {
+      const representative = group.consumers[0];
+      let section = group.inferredSectionKey ? sectionByKey.get(group.inferredSectionKey) : null;
+      if (!section) {
+        section = unassignedSection;
+      }
+
+      let equipmentIdentifier = group.equipmentIdentifier;
+      if (!equipmentIdentifier || usedEquipmentIdentifiers.has(equipmentIdentifier.toUpperCase())) {
+        const prefix = section.prefix.toUpperCase();
+        const current = maxBySectionPrefix.get(prefix) ?? 0;
+        const generatedSequence = current + 1;
+        maxBySectionPrefix.set(prefix, generatedSequence);
+        equipmentIdentifier = `${section.prefix}${generatedSequence}`;
+        report.generatedIdentifiers.push(equipmentIdentifier);
+      }
+
+      if (!group.inferredSectionKey && group.isGeneratedIdentifier) {
+        for (const consumer of group.consumers) {
+          report.unassignedRows.push({
+            consumerId: consumer.id,
+            reason: "Missing or invalid circuit number and no section inferred from phase/category.",
+          });
+        }
+      }
+
+      usedEquipmentIdentifiers.add(equipmentIdentifier.toUpperCase());
+
+      const circuitId = await this.circuitRepository.create({
+        circuitListId,
+        sectionId: section.id,
+        equipmentIdentifier,
+        displayName: representative.description ?? representative.name,
+        sortOrder: nextSortOrder,
+        protectionType: representative.protectionType ?? undefined,
+        protectionRatedCurrent: representative.protectionRatedCurrent ?? undefined,
+        protectionCharacteristic: representative.protectionCharacteristic ?? undefined,
+        cableType: representative.cableType ?? undefined,
+        cableCrossSection: representative.cableCrossSection ?? undefined,
+        voltage: representative.voltageV ?? undefined,
+        remark: undefined,
+      });
+      report.createdCircuitCount += 1;
+      nextSortOrder += 10;
+
+      let rowSortOrder = 10;
+      for (const consumer of group.consumers) {
+        const room = consumer.roomId ? roomById.get(consumer.roomId) : undefined;
+        let noteRemark = consumer.note?.trim() || consumer.comment?.trim() || undefined;
+        if (consumer.deviceType && consumer.deviceType.trim()) {
+          const legacyDeviceTypeNote = `Legacy deviceType: ${consumer.deviceType.trim()}`;
+          noteRemark = noteRemark ? `${noteRemark} | ${legacyDeviceTypeNote}` : legacyDeviceTypeNote;
+        }
+
+        await this.circuitDeviceRowRepository.create({
+          circuitId,
+          linkedProjectDeviceId: consumer.projectDeviceId ?? undefined,
+          legacyConsumerId: consumer.id,
+          sortOrder: rowSortOrder,
+          name: consumer.name,
+          displayName: consumer.description ?? consumer.name,
+          phaseType: consumer.phaseType ?? undefined,
+          connectionKind: undefined,
+          costGroup: consumer.tradeOrCostGroup ?? undefined,
+          category: consumer.category ?? undefined,
+          roomId: consumer.roomId ?? undefined,
+          roomNumberSnapshot: room?.roomNumber,
+          roomNameSnapshot: room?.roomName,
+          quantity: consumer.quantity,
+          powerPerUnit: consumer.installedPowerPerUnitKw,
+          simultaneityFactor: consumer.demandFactor,
+          cosPhi: consumer.powerFactor ?? undefined,
+          remark: noteRemark,
+        });
+        report.createdDeviceRowCount += 1;
+        rowSortOrder += 10;
+
+        const [createdRow] = await db
+          .select({ id: circuitDeviceRows.id })
+          .from(circuitDeviceRows)
+          .where(and(eq(circuitDeviceRows.circuitId, circuitId), eq(circuitDeviceRows.legacyConsumerId, consumer.id)))
+          .orderBy(circuitDeviceRows.sortOrder)
+          .limit(1);
+        if (!createdRow) {
+          throw new Error("Failed to resolve created circuit device row.");
+        }
+
+        await db.insert(legacyConsumerCircuitMigrations).values({
+          consumerId: consumer.id,
+          circuitId,
+          circuitDeviceRowId: createdRow.id,
+          circuitListId,
+          createdAtIso: new Date().toISOString(),
+        });
+      }
+    }
+
+    if (consumersToMigrate.some((consumer) => Boolean(consumer.comment?.trim()))) {
+      report.warnings.push(
+        "Legacy comment field was mapped to circuit_device_rows.remark because circuit-level vs row-level intent is ambiguous."
+      );
+    }
+
+    for (const row of report.unassignedRows) {
+      report.warnings.push(`Consumer ${row.consumerId} was migrated into unassigned section.`);
+    }
+
+    const existingReport = await db
+      .select({ id: legacyConsumerMigrationReports.id })
+      .from(legacyConsumerMigrationReports)
+      .where(eq(legacyConsumerMigrationReports.circuitListId, circuitListId))
+      .limit(1);
+    if (existingReport.length) {
+      await db
+        .update(legacyConsumerMigrationReports)
+        .set({
+          legacyConsumerCount: report.legacyConsumerCount,
+          createdCircuitCount: report.createdCircuitCount,
+          createdDeviceRowCount: report.createdDeviceRowCount,
+          duplicateGroupedCount: report.groupedDuplicateCircuitNumbers.length,
+          generatedIdentifierCount: report.generatedIdentifiers.length,
+          unassignedRowCount: report.unassignedRows.length,
+          warningsJson: JSON.stringify(report.warnings),
+          generatedIdentifiersJson: JSON.stringify(report.generatedIdentifiers),
+          duplicateGroupsJson: JSON.stringify(report.groupedDuplicateCircuitNumbers),
+          createdAtIso: new Date().toISOString(),
+        })
+        .where(eq(legacyConsumerMigrationReports.id, existingReport[0].id));
+    } else {
+      await db.insert(legacyConsumerMigrationReports).values({
+        id: crypto.randomUUID(),
+        circuitListId,
+        legacyConsumerCount: report.legacyConsumerCount,
+        createdCircuitCount: report.createdCircuitCount,
+        createdDeviceRowCount: report.createdDeviceRowCount,
+        duplicateGroupedCount: report.groupedDuplicateCircuitNumbers.length,
+        generatedIdentifierCount: report.generatedIdentifiers.length,
+        unassignedRowCount: report.unassignedRows.length,
+        warningsJson: JSON.stringify(report.warnings),
+        generatedIdentifiersJson: JSON.stringify(report.generatedIdentifiers),
+        duplicateGroupsJson: JSON.stringify(report.groupedDuplicateCircuitNumbers),
+        createdAtIso: new Date().toISOString(),
+      });
+    }
+
+    return report;
+  }
+}

src/server/controllers/circuit-tree.controller.ts

@@ -0,0 +1,113 @@
+import type { Request, Response } from "express";
+import { CircuitRepository } from "../../db/repositories/circuit.repository.js";
+import { CircuitDeviceRowRepository } from "../../db/repositories/circuit-device-row.repository.js";
+import { CircuitListRepository } from "../../db/repositories/circuit-list.repository.js";
+import { CircuitSectionRepository } from "../../db/repositories/circuit-section.repository.js";
+import type { CircuitTreeResponse } from "../../domain/models/circuit-tree.model.js";
+import { LegacyConsumerMigrationService } from "../../domain/services/legacy-consumer-migration.service.js";
+
+const circuitListRepository = new CircuitListRepository();
+const circuitSectionRepository = new CircuitSectionRepository();
+const circuitRepository = new CircuitRepository();
+const circuitDeviceRowRepository = new CircuitDeviceRowRepository();
+const legacyConsumerMigrationService = new LegacyConsumerMigrationService();
+
+function rowTotalPower(quantity: number, powerPerUnit: number, simultaneityFactor: number): number {
+  return quantity * powerPerUnit * simultaneityFactor;
+}
+
+export async function getCircuitTree(req: Request, res: Response) {
+  const { projectId, circuitListId } = req.params;
+  if (typeof projectId !== "string" || typeof circuitListId !== "string") {
+    return res.status(400).json({ error: "Invalid parameters" });
+  }
+
+  const list = await circuitListRepository.findById(projectId, circuitListId);
+  if (!list) {
+    return res.status(404).json({ error: "Circuit list not found" });
+  }
+
+  const migrationReport = await legacyConsumerMigrationService.migrateCircuitList(projectId, circuitListId);
+  const sections = await circuitSectionRepository.listByCircuitList(circuitListId);
+  const circuits = await circuitRepository.listByCircuitList(circuitListId);
+  const rows = await circuitDeviceRowRepository.listByCircuitList(circuits.map((entry) => entry.id));
+
+  const sectionById = new Map(sections.map((section) => [section.id, section]));
+  const rowsByCircuitId = new Map<string, typeof rows>();
+  for (const row of rows) {
+    if (!rowsByCircuitId.has(row.circuitId)) {
+      rowsByCircuitId.set(row.circuitId, []);
+    }
+    rowsByCircuitId.get(row.circuitId)!.push(row);
+  }
+
+  const tree: CircuitTreeResponse = {
+    circuitListId,
+    sections: sections.map((section) => ({
+      id: section.id,
+      key: section.key,
+      displayName: section.displayName,
+      prefix: section.prefix,
+      sortOrder: section.sortOrder,
+      circuits: [],
+    })),
+  };
+  const sectionBlocks = new Map(tree.sections.map((section) => [section.id, section]));
+
+  for (const circuit of circuits) {
+    const section = sectionById.get(circuit.sectionId);
+    if (!section || section.circuitListId !== circuit.circuitListId) {
+      continue;
+    }
+    const deviceRows = (rowsByCircuitId.get(circuit.id) ?? []).map((row) => ({
+      id: row.id,
+      linkedProjectDeviceId: row.linkedProjectDeviceId ?? undefined,
+      legacyConsumerId: row.legacyConsumerId ?? undefined,
+      sortOrder: row.sortOrder,
+      name: row.name,
+      displayName: row.displayName,
+      phaseType: row.phaseType ?? undefined,
+      connectionKind: row.connectionKind ?? undefined,
+      costGroup: row.costGroup ?? undefined,
+      category: row.category ?? undefined,
+      level: row.level ?? undefined,
+      roomId: row.roomId ?? undefined,
+      roomNumberSnapshot: row.roomNumberSnapshot ?? undefined,
+      roomNameSnapshot: row.roomNameSnapshot ?? undefined,
+      quantity: row.quantity,
+      powerPerUnit: row.powerPerUnit,
+      simultaneityFactor: row.simultaneityFactor,
+      cosPhi: row.cosPhi ?? undefined,
+      remark: row.remark ?? undefined,
+      overriddenFields: row.overriddenFields ?? undefined,
+      rowTotalPower: rowTotalPower(row.quantity, row.powerPerUnit, row.simultaneityFactor),
+    }));
+    const circuitTotalPower = deviceRows.reduce((sum, row) => sum + row.rowTotalPower, 0);
+
+    sectionBlocks.get(section.id)?.circuits.push({
+      id: circuit.id,
+      circuitListId: circuit.circuitListId,
+      sectionId: circuit.sectionId,
+      equipmentIdentifier: circuit.equipmentIdentifier,
+      displayName: circuit.displayName ?? undefined,
+      sortOrder: circuit.sortOrder,
+      protectionType: circuit.protectionType ?? undefined,
+      protectionRatedCurrent: circuit.protectionRatedCurrent ?? undefined,
+      protectionCharacteristic: circuit.protectionCharacteristic ?? undefined,
+      cableType: circuit.cableType ?? undefined,
+      cableCrossSection: circuit.cableCrossSection ?? undefined,
+      cableLength: circuit.cableLength ?? undefined,
+      rcdAssignment: circuit.rcdAssignment ?? undefined,
+      terminalDesignation: circuit.terminalDesignation ?? undefined,
+      voltage: circuit.voltage ?? undefined,
+      status: circuit.status ?? undefined,
+      isReserve: Boolean(circuit.isReserve),
+      remark: circuit.remark ?? undefined,
+      circuitTotalPower,
+      deviceRows,
+    });
+  }
+
+  return res.json({ ...tree, migrationReport });
+}
+

src/server/controllers/distribution-board.controller.ts

@@ -1,9 +1,11 @@
 import type { Request, Response } from "express";
 import { CircuitListRepository } from "../../db/repositories/circuit-list.repository.js";
+import { CircuitSectionRepository } from "../../db/repositories/circuit-section.repository.js";
 import { DistributionBoardRepository } from "../../db/repositories/distribution-board.repository.js";
 import { createDistributionBoardSchema } from "../../shared/validation/consumer.schemas.js";
 
 const circuitListRepository = new CircuitListRepository();
+const circuitSectionRepository = new CircuitSectionRepository();
 const distributionBoardRepository = new DistributionBoardRepository();
 
 export async function listDistributionBoardsByProject(req: Request, res: Response) {
@@ -28,10 +30,11 @@ export async function createDistributionBoard(req: Request, res: Response) {
   }
 
   const board = await distributionBoardRepository.create(projectId, parsed.data.name);
-  await circuitListRepository.createForDistributionBoard({
+  const list = await circuitListRepository.createForDistributionBoard({
     projectId,
     distributionBoardId: board.id,
     name: `${board.name} Stromkreisliste`,
   });
+  await circuitSectionRepository.createDefaults(list.id);
   return res.status(201).json(board);
 }

src/server/routes/project.routes.ts

@@ -12,6 +12,7 @@ import {
 import { listCircuitListsByProject } from "../controllers/circuit-list.controller.js";
 import { createFloor, listFloorsByProject } from "../controllers/floor.controller.js";
 import { createRoom, listRoomsByProject } from "../controllers/room.controller.js";
+import { getCircuitTree } from "../controllers/circuit-tree.controller.js";
 
 export const projectRouter = Router();
 
@@ -22,6 +23,7 @@ projectRouter.put("/:projectId", updateProjectSettings);
 projectRouter.get("/:projectId/distribution-boards", listDistributionBoardsByProject);
 projectRouter.post("/:projectId/distribution-boards", createDistributionBoard);
 projectRouter.get("/:projectId/circuit-lists", listCircuitListsByProject);
+projectRouter.get("/:projectId/circuit-lists/:circuitListId/tree", getCircuitTree);
 projectRouter.get("/:projectId/floors", listFloorsByProject);
 projectRouter.post("/:projectId/floors", createFloor);
 projectRouter.get("/:projectId/rooms", listRoomsByProject);

tests/legacy-consumer-migration-planner.test.ts

@@ -0,0 +1,57 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import {
+  inferSectionKeyFromEquipmentIdentifier,
+  inferSectionKeyFromLegacyInput,
+  normalizeCircuitNumber,
+} from "../src/domain/services/legacy-consumer-migration-planner.js";
+
+describe("legacy consumer migration planner", () => {
+  it("normalizes valid circuit numbers and rejects invalid formats", () => {
+    assert.equal(normalizeCircuitNumber(" -2f12 "), "-2F12");
+    assert.equal(normalizeCircuitNumber("2F12"), null);
+    assert.equal(normalizeCircuitNumber(""), null);
+    assert.equal(normalizeCircuitNumber(null), null);
+  });
+
+  it("infers section from equipment identifier prefix", () => {
+    assert.equal(inferSectionKeyFromEquipmentIdentifier("-1F4"), "lighting");
+    assert.equal(inferSectionKeyFromEquipmentIdentifier("-2F8"), "single_phase");
+    assert.equal(inferSectionKeyFromEquipmentIdentifier("-3F1"), "three_phase");
+    assert.equal(inferSectionKeyFromEquipmentIdentifier("-9F1"), null);
+  });
+
+  it("infers section from category/phase when circuit number is missing", () => {
+    assert.equal(
+      inferSectionKeyFromLegacyInput({
+        id: "1",
+        circuitNumber: null,
+        category: "Beleuchtung",
+        phaseType: null,
+        phaseCount: null,
+      }),
+      "lighting"
+    );
+    assert.equal(
+      inferSectionKeyFromLegacyInput({
+        id: "2",
+        circuitNumber: null,
+        category: null,
+        phaseType: "three-phase",
+        phaseCount: null,
+      }),
+      "three_phase"
+    );
+    assert.equal(
+      inferSectionKeyFromLegacyInput({
+        id: "3",
+        circuitNumber: null,
+        category: null,
+        phaseType: null,
+        phaseCount: null,
+      }),
+      null
+    );
+  });
+});
+