Kostenstellenhierarchie und Auswertung mit Unterkostenstellen ergänzt

backend/db/migrations/0033_costcentres_parent.sql

@@ -0,0 +1,2 @@
+ALTER TABLE "costcentres" ADD COLUMN "parent_costcentre" uuid;
+ALTER TABLE "costcentres" ADD CONSTRAINT "costcentres_parent_costcentre_costcentres_id_fk" FOREIGN KEY ("parent_costcentre") REFERENCES "public"."costcentres"("id") ON DELETE no action ON UPDATE no action;

backend/db/migrations/meta/_journal.json

@@ -232,6 +232,13 @@
       "when": 1776298800000,
       "tag": "0032_manual_statementallocations_invoice_side",
       "breakpoints": true
+    },
+    {
+      "idx": 33,
+      "version": "7",
+      "when": 1777003200000,
+      "tag": "0033_costcentres_parent",
+      "breakpoints": true
     }
   ]
 }

backend/db/schema/costcentres.ts

@@ -29,6 +29,8 @@ export const costcentres = pgTable("costcentres", {
     number: text("number").notNull(),
     name: text("name").notNull(),
 
+    parentCostcentre: uuid("parent_costcentre").references(() => costcentres.id),
+
     vehicle: bigint("vehicle", { mode: "number" }).references(() => vehicles.id),
 
     project: bigint("project", { mode: "number" }).references(() => projects.id),

backend/src/routes/resources/main.ts

@@ -11,7 +11,7 @@ import {
     sql,
 } from "drizzle-orm"
 
-import { authProfiles } from "../../../db/schema";
+import { authProfiles, costcentres } from "../../../db/schema";
 import { resourceConfig } from "../../utils/resource.config";
 import { useNextNumberRangeNumber } from "../../utils/functions";
 import { getHistoryEntityLabel, insertHistoryItem } from "../../utils/history";
@@ -260,6 +260,59 @@ function validateMemberPayload(payload: Record<string, any>) {
     return null
 }
 
+async function validateCostCentreParent(
+    server: FastifyInstance,
+    tenantId: number,
+    costCentreId: string | null,
+    parentCostcentreId: string | null
+) {
+    if (!parentCostcentreId) {
+        return null
+    }
+
+    const hierarchyRows = await server.db
+        .select({
+            id: costcentres.id,
+            parentCostcentre: costcentres.parentCostcentre,
+        })
+        .from(costcentres)
+        .where(eq(costcentres.tenant, tenantId))
+
+    const hierarchyMap = new Map(
+        hierarchyRows.map((row) => [row.id, row.parentCostcentre || null])
+    )
+
+    if (!hierarchyMap.has(parentCostcentreId)) {
+        return "Die übergeordnete Kostenstelle wurde nicht gefunden."
+    }
+
+    if (costCentreId && parentCostcentreId === costCentreId) {
+        return "Eine Kostenstelle kann nicht sich selbst als übergeordnete Kostenstelle haben."
+    }
+
+    if (!costCentreId) {
+        return null
+    }
+
+    let currentParentId: string | null = parentCostcentreId
+    const visited = new Set<string>()
+
+    while (currentParentId) {
+        if (currentParentId === costCentreId) {
+            return "Die ausgewählte übergeordnete Kostenstelle würde einen Zyklus erzeugen."
+        }
+
+        if (visited.has(currentParentId)) {
+            break
+        }
+
+        visited.add(currentParentId)
+        currentParentId = hierarchyMap.get(currentParentId) || null
+    }
+
+    return null
+}
+
 function maskIban(iban: string) {
     if (!iban) return ""
     const cleaned = iban.replace(/\s+/g, "")
@@ -730,6 +783,19 @@ export default async function resourceRoutes(server: FastifyInstance) {
                 createData = prepared.data!
             }
 
+            if (resource === "costcentres") {
+                const validationError = await validateCostCentreParent(
+                    server,
+                    req.user.tenant_id,
+                    null,
+                    createData.parentCostcentre || null
+                )
+
+                if (validationError) {
+                    return reply.code(400).send({ error: validationError })
+                }
+            }
+
             if (config.numberRangeHolder && !body[config.numberRangeHolder]) {
                 const numberRangeResource = resource === "members" ? "customers" : resource
                 const result = await useNextNumberRangeNumber(server, req.user.tenant_id, numberRangeResource)
@@ -836,6 +902,21 @@ export default async function resourceRoutes(server: FastifyInstance) {
                 }
             }
 
+            if (resource === "costcentres") {
+                const validationError = await validateCostCentreParent(
+                    server,
+                    tenantId,
+                    oldRecord.id,
+                    Object.prototype.hasOwnProperty.call(data, "parentCostcentre")
+                        ? data.parentCostcentre || null
+                        : oldRecord.parentCostcentre || null
+                )
+
+                if (validationError) {
+                    return reply.code(400).send({ error: validationError })
+                }
+            }
+
             Object.keys(data).forEach((key) => {
                 const value = data[key]
                 const shouldNormalize =

backend/src/utils/resource.config.ts

@@ -164,9 +164,13 @@ export const resourceConfig = {
     costcentres: {
         table: costcentres,
         searchColumns: ["name","number","description"],
-        mtoLoad: ["vehicle","project","inventoryitem","branch"],
+        mtoLoad: ["parentCostcentre","vehicle","project","inventoryitem","branch"],
         numberRangeHolder: "number",
     },
+    parentCostcentre: {
+        table: costcentres,
+        searchColumns: ["name", "number", "description"],
+    },
     branches: {
         table: branches,
         searchColumns: ["name","number","description"],