feat(mcp): manage master data and cost centre hierarchies

backend/src/modules/bootstrap.service.ts

@@ -24,15 +24,25 @@ const adminPermissions = [
     "mcp.tokens.write",
     "staff.time.read_all",
     "masterdata.customers.read",
+    "masterdata.customers.write",
     "masterdata.vendors.read",
+    "masterdata.vendors.write",
     "masterdata.contacts.read",
+    "masterdata.contacts.write",
     "masterdata.products.read",
+    "masterdata.products.write",
     "masterdata.services.read",
+    "masterdata.services.write",
     "masterdata.cost_centres.read",
+    "masterdata.cost_centres.write",
     "masterdata.branches.read",
+    "masterdata.branches.write",
     "masterdata.teams.read",
+    "masterdata.teams.write",
     "masterdata.vehicles.read",
+    "masterdata.vehicles.write",
     "masterdata.inventory_items.read",
+    "masterdata.inventory_items.write",
     "masterdata.units.read",
     "accounting.outgoing_documents.read",
     "accounting.outgoing_documents.write",

backend/src/modules/cost-centre-hierarchy.service.ts

@@ -0,0 +1,56 @@
+import { FastifyInstance } from "fastify"
+import { eq } from "drizzle-orm"
+import { costcentres } from "../../db/schema"
+
+export 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
+}