Merge pull request 'dev' (#252) from dev into main

Reviewed-on: #252
2026-10-27 20:39:01 +00:00
parent 9676a270da 9e003125c2
commit 1b617c7910
24 changed files with 1491 additions and 213 deletions
--- a/backend/src/mcp/fileUploads.ts
+++ b/backend/src/mcp/fileUploads.ts
@@ -0,0 +1,93 @@
+import { assertToolPermission } from "./authz"
+import { assertInternalDocumentAccess, MCP_FILE_LIMIT } from "./documentFiles"
+import { McpContext, McpTool } from "./types"
+import { createScannerInboxService, validateScannerFile } from "../modules/scanner-inbox.service"
+import { uploadIncomingInvoiceFile } from "./tools/accounting"
+import { secrets } from "../utils/secrets"
+
+export const MCP_UPLOAD_PATH = "/api/mcp/files"
+export const uploadTargets = ["inbox", "incoming_invoice"] as const
+export type UploadTarget = typeof uploadTargets[number]
+
+export type McpFileUpload = {
+    target: UploadTarget
+    filename: string
+    body: Buffer
+    mimeType?: string | null
+    invoiceId?: number | null
+    prepare?: boolean
+}
+
+export function mcpUploadUrl() {
+    const base = secrets.API_BASE_URL?.replace(/\/+$/, "")
+    return base ? `${base}${MCP_UPLOAD_PATH}` : MCP_UPLOAD_PATH
+}
+
+const badRequest = (message: string, statusCode = 400) => Object.assign(new Error(message), { statusCode })
+
+/** Reads the query options of the binary upload endpoint. */
+export function parseUploadQuery(query: Record<string, unknown>) {
+    const target = (query.target ?? "inbox") as UploadTarget
+    if (!uploadTargets.includes(target)) throw badRequest(`target muss ${uploadTargets.join(" oder ")} sein.`)
+    let invoiceId: number | null = null
+    if (query.invoiceId !== undefined && query.invoiceId !== "") {
+        invoiceId = Number(query.invoiceId)
+        if (!Number.isSafeInteger(invoiceId) || invoiceId < 1) throw badRequest("invoiceId muss eine positive ganze Zahl sein.")
+    }
+    if (query.prepare !== undefined && !["true", "false"].includes(String(query.prepare))) throw badRequest("prepare muss true oder false sein.")
+    if (target === "inbox" && (invoiceId || query.prepare !== undefined)) throw badRequest("invoiceId und prepare gelten nur für target=incoming_invoice.")
+    const filename = typeof query.filename === "string" && query.filename.trim() ? query.filename.trim() : null
+    return { target, invoiceId, prepare: String(query.prepare) !== "false", filename }
+}
+
+export async function storeMcpFileUpload(context: McpContext, upload: McpFileUpload) {
+    if (!upload.body.length) throw badRequest("Die Datei ist leer.")
+    if (upload.body.length > MCP_FILE_LIMIT) throw badRequest("MCP-Uploads sind auf 20 MiB begrenzt.", 413)
+    if (upload.target === "inbox") {
+        assertToolPermission(context, { name: "documents.files.upload", requiredPermissions: ["documents.write"] })
+        await assertInternalDocumentAccess(context)
+        const mimeType = validateScannerFile(upload.filename, upload.body)
+        const result = await createScannerInboxService(context.server.db).upload(context.tenantId, context.userId, upload.filename, upload.body)
+        return { ...result, filename: upload.filename, mimeType, size: upload.body.length }
+    }
+    assertToolPermission(context, { name: "accounting.incoming_invoices.files.upload", requiredPermissions: ["accounting.incoming_invoices.write"] })
+    return uploadIncomingInvoiceFile(context, {
+        filename: upload.filename,
+        buffer: upload.body,
+        mimeType: upload.mimeType || "application/octet-stream",
+        invoiceId: upload.invoiceId,
+        prepare: upload.prepare,
+    })
+}
+
+export const uploadUrlTool: McpTool = {
+    name: "documents.files.upload_url",
+    title: "Upload-Adresse für Dateien",
+    description: "Liefert die HTTP-Adresse, über die Dateien ohne Base64 direkt hochgeladen werden (multipart/form-data oder Rohdaten, maximal 20 MiB). Für Uploads mit Dateizugriff, z. B. per curl, statt documents.files.upload oder accounting.incoming_invoices.files.upload verwenden.",
+    // Informational only; the endpoint checks the permission of the chosen target.
+    requiredPermissions: [],
+    inputSchema: { type: "object", properties: {}, additionalProperties: false },
+    async handler() {
+        const url = mcpUploadUrl()
+        return {
+            url,
+            method: "POST",
+            authentication: "Authorization: Bearer <derselbe MCP-Token>",
+            bodies: {
+                multipart: "multipart/form-data mit dem Dateifeld file; der Dateiname wird aus dem Upload übernommen.",
+                raw: "Dateiinhalt als Body mit passendem Content-Type (application/pdf, image/jpeg, image/png, image/tiff, application/xml oder application/octet-stream) und Query-Parameter filename.",
+            },
+            query: {
+                target: "inbox (Standard, Dokumentenablage, benötigt documents.write) oder incoming_invoice (Eingangsrechnung, benötigt accounting.incoming_invoices.write).",
+                filename: "Dateiname; bei Rohdaten erforderlich, bei multipart optional zum Überschreiben.",
+                invoiceId: "Nur incoming_invoice: vorhandenen Eingangsbeleg verknüpfen.",
+                prepare: "Nur incoming_invoice: false unterdrückt die automatische Belegvorbereitung (Standard true).",
+            },
+            response: "JSON wie beim entsprechenden Base64-Werkzeug.",
+            examples: [
+                `curl -H "Authorization: Bearer $FEDEO_MCP_TOKEN" -F "file=@rechnung.pdf" "${url}?target=incoming_invoice"`,
+                `curl -H "Authorization: Bearer $FEDEO_MCP_TOKEN" -H "Content-Type: application/pdf" --data-binary @scan.pdf "${url}?filename=scan.pdf"`,
+            ],
+        }
+    },
+}
--- a/backend/src/mcp/registry.ts
+++ b/backend/src/mcp/registry.ts
@@ -3,6 +3,8 @@ import { masterdataTools } from "./tools/masterdata"
 import { organisationTools } from "./tools/organisation"
 import { wikiTools } from "./tools/wiki"
 import { documentTools } from "./tools/documents"
+import { archiveTools } from "./tools/archive"
+import { uploadUrlTool } from "./fileUploads"

 export const mcpTools = [
    ...accountingTools,
@@ -10,6 +12,8 @@ export const mcpTools = [
    ...organisationTools,
    ...wikiTools,
    ...documentTools,
+    ...archiveTools,
+    uploadUrlTool,
 ]

 export const mcpToolMap = new Map(mcpTools.map((tool) => [tool.name, tool]))
--- a/backend/src/mcp/tools/accounting.ts
+++ b/backend/src/mcp/tools/accounting.ts
@@ -1,6 +1,6 @@
 import { outgoingAddressSchema, outgoingRowsSchema, outgoingReportSchema } from "../documentSchemas"
 import { limitFromArgs, offsetFromArgs, paginatedResult, paginationProperties } from "../pagination"
-import { and, desc, eq, ilike, or } from "drizzle-orm"
+import { and, desc, eq, ilike, inArray, or } from "drizzle-orm"
 import { randomUUID } from "node:crypto"
 import { validateBankAllocationCostCentre } from "../../modules/bank-allocation-details"
 import {
@@ -22,11 +22,14 @@ import { saveFile } from "../../utils/files"
 import { insertHistoryItem } from "../../utils/history"
 import { executeManualGeneration, finishManualGeneration } from "../../modules/serialexecution.service"
 import { updateOutgoingDocumentCostCentres } from "../../modules/outgoing-document-cost-centres.service"
+import { updateIncomingInvoiceCostCentres } from "../../modules/incoming-invoice-cost-centres.service"
+import { loadBankBalances } from "../../modules/bank-balances.service"
+import { dateField } from "../masterdataFields"
 import {
    prepareStatementAllocationInput,
    statementAllocationUuidArg,
 } from "../statementAllocations"
-import { McpTool } from "../types"
+import { McpContext, McpTool } from "../types"
 import { outgoingStatusTools } from "./outgoingStatus"

 export { prepareStatementAllocationInput } from "../statementAllocations"
@@ -309,6 +312,98 @@ const loadIncomingInvoiceFileDefaults = async (context: { server: any; tenantId:
    }
 }

+export type IncomingInvoiceFileUpload = {
+    filename: string
+    buffer: Buffer
+    mimeType: string
+    invoiceId?: number | null
+    invoiceArgs?: Record<string, unknown> | null
+    prepare?: boolean
+}
+
+/** Shared by the Base64 tool and the binary MCP upload endpoint. */
+export async function uploadIncomingInvoiceFile(context: McpContext, upload: IncomingInvoiceFileUpload) {
+    const { filename, buffer, mimeType } = upload
+    const invoiceId = upload.invoiceId || null
+    const invoiceArgs = upload.invoiceArgs || null
+    const shouldPrepare = upload.prepare !== false && !invoiceId && !invoiceArgs
+    if (!buffer.length) throw new Error("Datei ist leer")
+    if (buffer.length > MAX_MCP_UPLOAD_BYTES) throw new Error("Datei ist größer als 20 MB")
+
+    let linkedInvoice: any = null
+
+    if (invoiceId) {
+        const [existing] = await context.server.db
+            .select()
+            .from(incominginvoices)
+            .where(and(eq(incominginvoices.id, invoiceId), eq(incominginvoices.tenant, context.tenantId)))
+            .limit(1)
+
+        if (!existing) throw new Error("Eingangsbeleg nicht gefunden")
+        linkedInvoice = existing
+    } else if (invoiceArgs) {
+        const payload = buildIncomingInvoicePayload(invoiceArgs, context.userId, context.tenantId, true)
+        payload.state = "Entwurf"
+
+        const [createdInvoice] = await context.server.db
+            .insert(incominginvoices)
+            .values(payload as any)
+            .returning()
+
+        linkedInvoice = createdInvoice
+    }
+
+    const defaults = await loadIncomingInvoiceFileDefaults(context)
+    const saved = await saveFile(
+        context.server,
+        context.tenantId,
+        null,
+        {
+            filename,
+            content: buffer,
+            contentType: mimeType,
+        },
+        defaults.folderId,
+        defaults.fileTagId,
+        {
+            incominginvoice: linkedInvoice?.id || null,
+            createdBy: context.userId,
+            updatedBy: context.userId,
+            updatedAt: new Date(),
+        }
+    )
+
+    if (!saved) throw new Error("Datei konnte nicht gespeichert werden")
+
+    if (shouldPrepare) {
+        // Only the uploaded file; other open invoice files stay for an explicit preparation run.
+        await context.server.services.prepareIncomingInvoices.run(context.tenantId, { fileIds: [saved.id] })
+    }
+
+    const [file] = await context.server.db
+        .select()
+        .from(files)
+        .where(and(eq(files.id, saved.id), eq(files.tenant, context.tenantId)))
+        .limit(1)
+
+    if (file?.incominginvoice && !linkedInvoice) {
+        const [preparedInvoice] = await context.server.db
+            .select()
+            .from(incominginvoices)
+            .where(and(eq(incominginvoices.id, file.incominginvoice), eq(incominginvoices.tenant, context.tenantId)))
+            .limit(1)
+
+        linkedInvoice = preparedInvoice || null
+    }
+
+    return {
+        file,
+        invoice: linkedInvoice,
+        validation: linkedInvoice ? validateIncomingInvoiceData(linkedInvoice as Record<string, any>) : null,
+        prepared: Boolean(shouldPrepare && linkedInvoice),
+    }
+}
+
 const buildIncomingInvoicePayload = (
    args: Record<string, unknown>,
    userId: string,
@@ -1011,7 +1106,7 @@ export const accountingTools: McpTool[] = [
    {
        name: "accounting.incoming_invoices.files.upload",
        title: "Datei für Eingangsbeleg hochladen",
-        description: "Lädt eine PDF- oder Bilddatei als Base64 hoch, verknüpft sie optional mit einem Eingangsbeleg oder stößt die automatische Vorbereitung an.",
+        description: "Lädt eine PDF- oder Bilddatei als Base64 hoch, verknüpft sie optional mit einem Eingangsbeleg oder stößt die automatische Vorbereitung dieser Datei an. Mit Dateizugriff besser ohne Base64 über die Adresse aus documents.files.upload_url (target=incoming_invoice) hochladen.",
        requiredPermissions: ["accounting.incoming_invoices.write"],
        inputSchema: {
            type: "object",
@@ -1047,83 +1142,14 @@ export const accountingTools: McpTool[] = [
            const filename = stringArg(args, "filename")
            if (!filename) throw new Error("filename ist erforderlich")

-            const buffer = base64BufferArg(args, "contentBase64")
-            const mimeType = stringArg(args, "mimeType") || "application/octet-stream"
-            const invoiceId = numberArg(args, "invoiceId")
-            const invoiceArgs = optionalObjectArg(args, "invoice") as Record<string, unknown> | null
-            const shouldPrepare = args.prepare !== false && !invoiceId && !invoiceArgs
-
-            let linkedInvoice: any = null
-
-            if (invoiceId) {
-                const [existing] = await context.server.db
-                    .select()
-                    .from(incominginvoices)
-                    .where(and(eq(incominginvoices.id, invoiceId), eq(incominginvoices.tenant, context.tenantId)))
-                    .limit(1)
-
-                if (!existing) throw new Error("Eingangsbeleg nicht gefunden")
-                linkedInvoice = existing
-            } else if (invoiceArgs) {
-                const payload = buildIncomingInvoicePayload(invoiceArgs, context.userId, context.tenantId, true)
-                payload.state = "Entwurf"
-
-                const [createdInvoice] = await context.server.db
-                    .insert(incominginvoices)
-                    .values(payload as any)
-                    .returning()
-
-                linkedInvoice = createdInvoice
-            }
-
-            const defaults = await loadIncomingInvoiceFileDefaults(context)
-            const saved = await saveFile(
-                context.server,
-                context.tenantId,
-                null,
-                {
-                    filename,
-                    content: buffer,
-                    contentType: mimeType,
-                },
-                defaults.folderId,
-                defaults.fileTagId,
-                {
-                    incominginvoice: linkedInvoice?.id || null,
-                    createdBy: context.userId,
-                    updatedBy: context.userId,
-                    updatedAt: new Date(),
-                }
-            )
-
-            if (!saved) throw new Error("Datei konnte nicht gespeichert werden")
-
-            if (shouldPrepare) {
-                await context.server.services.prepareIncomingInvoices.run(context.tenantId)
-            }
-
-            const [file] = await context.server.db
-                .select()
-                .from(files)
-                .where(and(eq(files.id, saved.id), eq(files.tenant, context.tenantId)))
-                .limit(1)
-
-            if (file?.incominginvoice && !linkedInvoice) {
-                const [preparedInvoice] = await context.server.db
-                    .select()
-                    .from(incominginvoices)
-                    .where(and(eq(incominginvoices.id, file.incominginvoice), eq(incominginvoices.tenant, context.tenantId)))
-                    .limit(1)
-
-                linkedInvoice = preparedInvoice || null
-            }
-
-            return {
-                file,
-                invoice: linkedInvoice,
-                validation: linkedInvoice ? validateIncomingInvoiceData(linkedInvoice as Record<string, any>) : null,
-                prepared: Boolean(shouldPrepare && linkedInvoice),
-            }
+            return uploadIncomingInvoiceFile(context, {
+                filename,
+                buffer: base64BufferArg(args, "contentBase64"),
+                mimeType: stringArg(args, "mimeType") || "application/octet-stream",
+                invoiceId: numberArg(args, "invoiceId"),
+                invoiceArgs: optionalObjectArg(args, "invoice") as Record<string, unknown> | null,
+                prepare: args.prepare !== false,
+            })
        },
    },
    {
@@ -1152,6 +1178,62 @@ export const accountingTools: McpTool[] = [
            return validateIncomingInvoiceData(rows[0] as Record<string, any>)
        },
    },
+    {
+        name: "accounting.incoming_invoices.prepare",
+        title: "Belegvorbereitung starten",
+        description: "Startet die Belegvorbereitung wie der Button „Belege vorbereiten“: Dateien vom Typ Eingangsrechnung ohne verknüpften Beleg werden ausgelesen (strukturierte E-Rechnung, sonst KI) und als Eingangsbeleg-Entwurf angelegt. Optional nur für bestimmte Datei-IDs. Kann je Datei einige Sekunden dauern.",
+        requiredPermissions: ["accounting.incoming_invoices.write"],
+        inputSchema: {
+            type: "object",
+            properties: {
+                fileIds: {
+                    type: "array",
+                    items: { type: "string", format: "uuid" },
+                    minItems: 1,
+                    maxItems: 50,
+                    description: "Optionale Datei-IDs; ohne Angabe alle offenen Eingangsrechnungsdateien.",
+                },
+            },
+            additionalProperties: false,
+        },
+        async handler(context, args) {
+            let fileIds: string[] | undefined
+            if (args.fileIds !== undefined) {
+                if (!Array.isArray(args.fileIds) || !args.fileIds.length || args.fileIds.length > 50) {
+                    throw new Error("fileIds muss 1 bis 50 Datei-IDs enthalten")
+                }
+                if (args.fileIds.some((id) => typeof id !== "string" || !UUID_PATTERN.test(id))) {
+                    throw new Error("fileIds darf nur gültige UUIDs enthalten")
+                }
+                fileIds = [...new Set((args.fileIds as string[]).map((id) => id.toLowerCase()))]
+            }
+
+            const result = await context.server.services.prepareIncomingInvoices.run(context.tenantId, { fileIds })
+            if (result.error && !result.filesFound) throw new Error(result.error)
+
+            const invoiceIds = result.created.map((entry) => entry.invoiceId)
+            const invoices = invoiceIds.length
+                ? await context.server.db
+                    .select()
+                    .from(incominginvoices)
+                    .where(and(eq(incominginvoices.tenant, context.tenantId), inArray(incominginvoices.id, invoiceIds)))
+                : []
+            const handled = new Set([...result.created, ...result.skipped].map((entry) => entry.fileId))
+
+            return {
+                filesFound: result.filesFound,
+                created: result.created.map((entry) => {
+                    const invoice = invoices.find((row) => row.id === entry.invoiceId) || null
+                    return { ...entry, invoice, validation: invoice ? validateIncomingInvoiceData(invoice as Record<string, any>) : null }
+                }),
+                skipped: [
+                    ...result.skipped,
+                    ...(fileIds || []).filter((id) => !handled.has(id))
+                        .map((fileId) => ({ fileId, reason: "Keine offene Eingangsrechnungsdatei (nicht gefunden, archiviert, anderer Dateityp oder bereits vorbereitet)" })),
+                ],
+            }
+        },
+    },
    {
        name: "accounting.incoming_invoices.create",
        title: "Eingangsbeleg erstellen",
@@ -1229,6 +1311,44 @@ export const accountingTools: McpTool[] = [
            return { invoice: updated, validation: validateIncomingInvoiceData(updated as Record<string, any>) }
        },
    },
+    {
+        name: "accounting.incoming_invoices.cost_centres.update",
+        title: "Kostenstellen eines Eingangsbelegs ändern",
+        description: "Ändert ausschließlich die Positionskostenstellen eines Eingangsbelegs, auch wenn er gebucht oder einer Bankbuchung zugewiesen ist.",
+        requiredPermissions: ["accounting.incoming_invoices.write"],
+        inputSchema: {
+            type: "object",
+            required: ["id", "accountCostCentres"],
+            properties: {
+                id: { type: "number" },
+                accountCostCentres: {
+                    type: "array",
+                    minItems: 1,
+                    items: {
+                        type: "object",
+                        required: ["index", "costcentre"],
+                        properties: {
+                            index: { type: "integer", minimum: 0, description: "Nullbasierter Index der Position in accounts." },
+                            costcentre: { type: ["string", "null"], description: "UUID der Positionskostenstelle oder null." },
+                        },
+                    },
+                },
+            },
+        },
+        async handler(context, args) {
+            const id = numberArg(args, "id")
+            if (!id) throw new Error("id ist erforderlich")
+
+            const invoice = await updateIncomingInvoiceCostCentres(
+                context.server,
+                context.tenantId,
+                context.userId,
+                id,
+                { accountCostCentres: args.accountCostCentres as any },
+            )
+            return { invoice }
+        },
+    },
    {
        name: "accounting.incoming_invoices.book",
        title: "Eingangsbeleg buchen",
@@ -1310,6 +1430,26 @@ export const accountingTools: McpTool[] = [
            return { invoice: updated }
        },
    },
+    {
+        name: "accounting.bank_accounts.balances",
+        title: "Kontostände abfragen",
+        description: "Liefert die Kontostände der Bankkonten und Kassenbücher des aktiven Mandanten samt Summe. Bankkonten zeigen den zuletzt synchronisierten Buchungssaldo; mit asOf wird der Stand zu einem vergangenen Datum aus den Bankumsätzen zurückgerechnet. Kassenbücher ergeben sich aus Anfangsbestand und Buchungen.",
+        requiredPermissions: ["accounting.bank.read"],
+        inputSchema: {
+            type: "object",
+            properties: {
+                account: { type: "number", description: "Optionale Bankkonto-ID; ohne Angabe alle Konten." },
+                asOf: { ...dateField.schema, description: "Optionaler Stichtag YYYY-MM-DD (Stand zum Tagesende)." },
+            },
+        },
+        async handler(context, args) {
+            const account = numberArg(args, "account")
+            const asOf = args.asOf === undefined || args.asOf === null ? null : dateField.parse(args.asOf, "asOf")
+            const result = await loadBankBalances(context.server, context.tenantId, { account, asOf })
+            if (account && !result.accounts.length) throw new Error("Bankkonto nicht gefunden")
+            return result
+        },
+    },
    {
        name: "accounting.bank_statements.list",
        title: "Bankumsätze auflisten",
--- a/backend/src/mcp/tools/archive.ts
+++ b/backend/src/mcp/tools/archive.ts
@@ -0,0 +1,150 @@
+import { and, desc, eq, getTableColumns, ilike, or } from "drizzle-orm"
+import * as tables from "../../../db/schema"
+import { assertToolPermission } from "../authz"
+import { assertInternalDocumentAccess } from "../documentFiles"
+import { idField, InputField, numericField, objectField, textField, uuidField } from "../masterdataFields"
+import { limitFromArgs, offsetFromArgs, paginatedResult, paginationProperties } from "../pagination"
+import { McpContext, McpTool } from "../types"
+import { insertHistoryItem } from "../../utils/history"
+import { recalculateServicePricesForTenant } from "../../modules/service-price-recalculation.service"
+
+type ArchiveEntity = {
+    label: string
+    table: any
+    /** Key used by the history log and the generic resource routes. */
+    resource: string
+    permission: string
+    searchColumns: string[]
+    uuid?: boolean
+    internalDocuments?: boolean
+}
+
+const masterdata = (label: string, table: any, resource: string, namespace: string, searchColumns: string[], uuid = false): ArchiveEntity =>
+    ({ label, table, resource, permission: `masterdata.${namespace}`, searchColumns, uuid })
+
+/** Every entity the MCP can archive; restore checks the matching write permission. */
+export const archiveEntities: Record<string, ArchiveEntity> = {
+    customers: masterdata("Kunde", tables.customers, "customers", "customers", ["name", "customerNumber"]),
+    vendors: masterdata("Lieferant", tables.vendors, "vendors", "vendors", ["name", "vendorNumber"]),
+    contacts: masterdata("Kontakt", tables.contacts, "contacts", "contacts", ["fullName", "email"]),
+    products: masterdata("Artikel", tables.products, "products", "products", ["name", "article_number"]),
+    services: masterdata("Leistung", tables.services, "services", "services", ["name"]),
+    cost_centres: masterdata("Kostenstelle", tables.costcentres, "costcentres", "cost_centres", ["name", "number"], true),
+    branches: masterdata("Niederlassung", tables.branches, "branches", "branches", ["name", "number"]),
+    teams: masterdata("Team", tables.teams, "teams", "teams", ["name"]),
+    vehicles: masterdata("Fahrzeug", tables.vehicles, "vehicles", "vehicles", ["name", "license_plate"]),
+    inventory_items: masterdata("Inventar", tables.inventoryitems, "inventoryitems", "inventory_items", ["name", "articleNumber"]),
+    projects: { label: "Projekt", table: tables.projects, resource: "projects", permission: "organisation.projects", searchColumns: ["name", "projectNumber"] },
+    events: { label: "Termin", table: tables.events, resource: "events", permission: "organisation.events", searchColumns: ["name"] },
+    tasks: { label: "Aufgabe", table: tables.tasks, resource: "tasks", permission: "organisation.tasks", searchColumns: ["name"] },
+    outgoing_documents: { label: "Ausgangsbeleg", table: tables.createddocuments, resource: "createddocuments", permission: "accounting.outgoing_documents", searchColumns: ["documentNumber", "title"] },
+    incoming_invoices: { label: "Eingangsbeleg", table: tables.incominginvoices, resource: "incominginvoices", permission: "accounting.incoming_invoices", searchColumns: ["reference", "description"] },
+    files: { label: "Datei", table: tables.files, resource: "files", permission: "documents", searchColumns: ["name"], uuid: true, internalDocuments: true },
+}
+
+const entityField: InputField = {
+    schema: { type: "string", enum: Object.keys(archiveEntities), description: "Art des archivierten Datensatzes." },
+    parse(value, path) {
+        if (typeof value !== "string" || !Object.prototype.hasOwnProperty.call(archiveEntities, value)) throw new Error(`${path}: unbekannte Entität`)
+        return value
+    },
+}
+const entityIdField: InputField = {
+    schema: { type: ["integer", "string"], description: "ID des Datensatzes; UUID bei cost_centres und files, sonst ganze Zahl." },
+    parse: (value) => value,
+}
+const searchField: InputField = {
+    schema: { type: "string", maxLength: 200, description: "Optionaler Suchtext, z. B. Name oder Nummer." },
+    parse(value, path) {
+        const text = textField().parse(value, path)
+        if (text.length > 200) throw new Error(`${path}: maximal 200 Zeichen`)
+        return text
+    },
+}
+const listInput = objectField({
+    entity: entityField,
+    search: searchField,
+    limit: { ...numericField(true, 1, 100), schema: paginationProperties.limit },
+    offset: { ...numericField(true, 0), schema: paginationProperties.offset },
+})
+const restoreInput = objectField({ entity: entityField, id: entityIdField })
+
+const columnKey = (table: any, ...names: string[]) => names.find((name) => name in getTableColumns(table))
+
+/** asToolResult hides records flagged archived; archived rows are marked explicitly instead. */
+const withoutArchivedFlag = ({ archived: _archived, path: _path, extractedText: _text, ...row }: Record<string, any>) => row
+
+async function authorize(context: McpContext, tool: McpTool, entity: ArchiveEntity, access: "read" | "write") {
+    assertToolPermission(context, { name: tool.name, requiredPermissions: [`${entity.permission}.${access}`] })
+    if (entity.internalDocuments) await assertInternalDocumentAccess(context)
+}
+
+export function prepareArchiveRestoreInput(args: Record<string, unknown>) {
+    const input = restoreInput.parse(args, "arguments")
+    if (!input.entity) throw new Error("entity ist erforderlich")
+    if (input.id === undefined || input.id === null) throw new Error("id ist erforderlich")
+    const entity = archiveEntities[input.entity]
+    return { key: input.entity as string, entity, id: (entity.uuid ? uuidField : idField).parse(input.id, "id") }
+}
+
+const listTool: McpTool = {
+    name: "archive.entities.list",
+    title: "Archivierte Einträge auflisten",
+    description: "Listet archivierte Datensätze einer Entitätsart im aktiven Mandanten, zuletzt geänderte zuerst. IDs anschließend mit archive.entities.restore wiederherstellen.",
+    // Checked per entity in the handler.
+    requiredPermissions: [],
+    inputSchema: { ...listInput.schema, required: ["entity"] },
+    async handler(context, args) {
+        const input = listInput.parse(args, "arguments")
+        if (!input.entity) throw new Error("entity ist erforderlich")
+        const entity = archiveEntities[input.entity]
+        await authorize(context, listTool, entity, "read")
+        const table = entity.table
+        const conditions: any[] = [eq(table.tenant, context.tenantId), eq(table.archived, true)]
+        if (input.search) {
+            const pattern = `%${input.search.replace(/[\\%_]/g, "\\$&")}%`
+            conditions.push(or(...entity.searchColumns.map((column) => ilike(table[column], pattern))))
+        }
+        const updatedAt = columnKey(table, "updatedAt", "updated_at")!
+        const rows = await context.server.db.select().from(table).where(and(...conditions))
+            .orderBy(desc(table[updatedAt]), desc(table.id)).limit(limitFromArgs(input) + 1).offset(offsetFromArgs(input))
+        const result = paginatedResult(rows, input)
+        return { ...result, entity: input.entity, rows: result.rows.map((row: any) => ({ ...withoutArchivedFlag(row), isArchived: true })) }
+    },
+}
+
+const restoreTool: McpTool = {
+    name: "archive.entities.restore",
+    title: "Archivierten Eintrag wiederherstellen",
+    description: `Stellt einen archivierten Datensatz im aktiven Mandanten wieder her (entity: ${Object.keys(archiveEntities).join(", ")}). Benötigt die Schreibberechtigung der jeweiligen Entität.`,
+    requiredPermissions: [],
+    readOnly: false,
+    inputSchema: { ...restoreInput.schema, required: ["entity", "id"] },
+    async handler(context, args) {
+        const { key, entity, id } = prepareArchiveRestoreInput(args)
+        await authorize(context, restoreTool, entity, "write")
+        const table = entity.table
+        return context.server.db.transaction(async (tx) => {
+            const server = { ...context.server, db: tx } as unknown as McpContext["server"]
+            const scope = and(eq(table.id, id), eq(table.tenant, context.tenantId))
+            const [existing] = await tx.select().from(table).where(scope).limit(1).for("update")
+            if (!existing) throw new Error(`${entity.label} nicht gefunden`)
+            if (!existing.archived) throw new Error(`${entity.label} ist nicht archiviert`)
+            const [result] = await tx.update(table).set({
+                archived: false,
+                [columnKey(table, "updatedAt", "updated_at")!]: new Date(),
+                [columnKey(table, "updatedBy", "updated_by")!]: context.userId,
+            }).where(scope).returning()
+            if (["products", "services"].includes(entity.resource)) {
+                await recalculateServicePricesForTenant(server, context.tenantId, context.userId)
+            }
+            await insertHistoryItem(server, {
+                tenant_id: context.tenantId, created_by: context.userId, entity: entity.resource, entityId: result.id,
+                action: "restored", oldVal: existing, newVal: result,
+            })
+            return { entity: key, id: result.id, success: true, action: "restored", record: withoutArchivedFlag(result) }
+        })
+    },
+}
+
+export const archiveTools: McpTool[] = [listTool, restoreTool]
--- a/backend/src/mcp/tools/documents.ts
+++ b/backend/src/mcp/tools/documents.ts
@@ -135,7 +135,7 @@ export function createDocumentTools(dependencies: Dependencies = {}): McpTool[]
                const body = await readFile(file.path, MCP_FILE_LIMIT)
                return { ...metadata, size: body.length, contentBase64: body.toString("base64") }
            }),
-        tool("files.upload", "PDF oder Scan hochladen", "Lädt eine vollständige PDF-, JPEG-, PNG- oder TIFF-Datei als Base64 (maximal 20 MiB, ohne Data-URL-Präfix) in die Dokumentenablage. Danach documents.inbox.file verwenden. Gleicher Dateiname und Inhalt werden nicht erneut angelegt; anderer Inhalt unter demselben Namen wird abgewiesen.", true,
+        tool("files.upload", "PDF oder Scan hochladen", "Lädt eine vollständige PDF-, JPEG-, PNG- oder TIFF-Datei als Base64 (maximal 20 MiB, ohne Data-URL-Präfix) in die Dokumentenablage. Mit Dateizugriff besser ohne Base64 über die Adresse aus documents.files.upload_url hochladen. Danach documents.inbox.file verwenden. Gleicher Dateiname und Inhalt werden nicht erneut angelegt; anderer Inhalt unter demselben Namen wird abgewiesen.", true,
            { filename: filenameField, contentBase64: { schema: { type: "string", minLength: 1, maxLength: Math.ceil(MCP_FILE_LIMIT / 3) * 4 }, parse: value => value } },
            ["filename", "contentBase64"], async (context, args) => {
                const { body, mimeType } = decodeDocumentUpload(args.filename as string, args.contentBase64)
--- a/backend/src/mcp/types.ts
+++ b/backend/src/mcp/types.ts
@@ -23,6 +23,8 @@ export type McpTool = {
    title: string
    description: string
    requiredPermissions: string[]
+    /** Overrides the readOnlyHint derived from requiredPermissions, e.g. for per-entity checks. */
+    readOnly?: boolean
    inputSchema: Record<string, unknown>
    handler: (context: McpContext, args: Record<string, unknown>) => Promise<unknown>
 }
--- a/backend/src/modules/bank-balances.service.ts
+++ b/backend/src/modules/bank-balances.service.ts
@@ -0,0 +1,71 @@
+import { FastifyInstance } from "fastify"
+import { and, eq, sql } from "drizzle-orm"
+import { bankaccounts, bankstatements } from "../../db/schema"
+
+export const CASHBOOK_BANK_ID = "fedeo-cashbook"
+
+type BalanceAccount = Pick<typeof bankaccounts.$inferSelect, "id" | "name" | "iban" | "ownerName" | "bankId" | "datevNumber" | "balance" | "expired" | "syncedAt">
+
+const roundMoney = (value: number) => Math.round(value * 100) / 100
+
+/**
+ * Bank accounts store the last synced booked balance; cashbooks store their opening balance
+ * and derive the current balance from their bookings. For a past date, bank balances are
+ * reconstructed by reverting the statements booked after that date.
+ */
+export function calculateAccountBalance(account: BalanceAccount, statementSum: number, asOf: string | null) {
+    const cashbook = account.bankId === CASHBOOK_BANK_ID
+    const stored = Number(account.balance || 0)
+    const balance = cashbook ? stored + statementSum : stored - statementSum
+    return {
+        id: account.id,
+        type: cashbook ? "cashbook" : "bank",
+        name: account.name || account.ownerName || (cashbook ? "Kassenbuch" : "Bankkonto"),
+        iban: cashbook ? null : account.iban,
+        datevNumber: account.datevNumber,
+        expired: account.expired,
+        balance: roundMoney(balance),
+        currency: "EUR",
+        ...(cashbook ? { openingBalance: roundMoney(stored) } : { syncedBalance: roundMoney(stored), syncedAt: account.syncedAt }),
+        source: cashbook ? "cashbook_bookings" : asOf ? "bank_sync_reconstructed" : "bank_sync",
+    }
+}
+
+export async function loadBankBalances(server: FastifyInstance, tenantId: number, options: { account?: number | null; asOf?: string | null } = {}) {
+    const asOf = options.asOf || null
+    const conditions = [eq(bankaccounts.tenant, tenantId), eq(bankaccounts.archived, false)]
+    if (options.account) conditions.push(eq(bankaccounts.id, options.account))
+    const accounts = await server.db.select().from(bankaccounts).where(and(...conditions)).orderBy(bankaccounts.name, bankaccounts.id)
+
+    const sums = async (dateCondition: any) => {
+        const rows = await server.db
+            .select({ account: bankstatements.account, total: sql<string>`coalesce(sum(${bankstatements.amount}), 0)` })
+            .from(bankstatements)
+            .where(and(eq(bankstatements.tenant, tenantId), eq(bankstatements.archived, false), ...(dateCondition ? [dateCondition] : [])))
+            .groupBy(bankstatements.account)
+        return new Map(rows.map((row) => [row.account, Number(row.total)]))
+    }
+    // Synced statements may carry a full timestamp; compare the calendar day only.
+    const bookingDay = sql`left(${bankstatements.date}, 10)`
+    // Cashbooks need bookings up to the date, bank accounts only those after it.
+    const cashbookSums = await sums(asOf ? sql`${bookingDay} <= ${asOf}` : null)
+    const bankSums = asOf ? await sums(sql`${bookingDay} > ${asOf}`) : new Map<number, number>()
+
+    const balances = accounts.map((account) => calculateAccountBalance(
+        account,
+        (account.bankId === CASHBOOK_BANK_ID ? cashbookSums : bankSums).get(account.id) || 0,
+        asOf,
+    ))
+    const active = balances.filter((account) => !account.expired)
+    return {
+        asOf,
+        accounts: balances,
+        totals: {
+            balance: roundMoney(active.reduce((sum, account) => sum + account.balance, 0)),
+            bank: roundMoney(active.filter((account) => account.type === "bank").reduce((sum, account) => sum + account.balance, 0)),
+            cashbook: roundMoney(active.filter((account) => account.type === "cashbook").reduce((sum, account) => sum + account.balance, 0)),
+            currency: "EUR",
+            note: "Summen ohne abgelaufene Bankverbindungen.",
+        },
+    }
+}
--- a/backend/src/modules/cron/prepareIncomingInvoices.ts
+++ b/backend/src/modules/cron/prepareIncomingInvoices.ts
@@ -17,7 +17,7 @@ import {
    incominginvoices,
 } from "../../../db/schema"

-import { eq, and, isNull, not } from "drizzle-orm"
+import { eq, and, inArray, isNull, not } from "drizzle-orm"

 const formatInvoiceItemDescription = (item: any) => {
    const parts = [
@@ -86,8 +86,25 @@ const mapGptDataToIncomingInvoice = (data: any, tenantId: number) => {
    return itemInfo
 }

+export type IncomingInvoicePreparationResult = {
+    filesFound: number
+    created: Array<{ fileId: string, invoiceId: number, source: string | null }>
+    skipped: Array<{ fileId: string, reason: string }>
+    error?: string
+}
+
+export type IncomingInvoicePreparationStatus = {
+    running: boolean
+    startedAt: string | null
+    finishedAt: string | null
+    result: IncomingInvoicePreparationResult | null
+}
+
+class FileAlreadyPreparedError extends Error {}
+
 export function prepareIncomingInvoices(server: FastifyInstance) {
-    const processInvoices = async (tenantId:number) => {
+    const processInvoices = async (tenantId:number, fileIds?: string[]) => {
+        const result: IncomingInvoicePreparationResult = { filesFound: 0, created: [], skipped: [] }
        console.log("▶ Starting Incoming Invoice Preparation")

        const tenantsRes = await server.db
@@ -98,7 +115,7 @@ export function prepareIncomingInvoices(server: FastifyInstance) {

        if (!tenantsRes.length) {
            console.log("No tenants with autoPrepareIncomingInvoices = true")
-            return
+            return { ...result, error: "Mandant nicht gefunden" }
        }

        console.log(`Processing tenants: ${tenantsRes.map(t => t.id).join(", ")}`)
@@ -124,6 +141,7 @@ export function prepareIncomingInvoices(server: FastifyInstance) {
            const invoiceFileTag = tagRes?.[0]?.id
            if (!invoiceFileTag) {
                server.log.error(`❌ Missing filetag 'invoices' for tenant ${tenantId}`)
+                result.error = "Dateityp für Eingangsrechnungen fehlt"
                continue
            }

@@ -137,10 +155,13 @@ export function prepareIncomingInvoices(server: FastifyInstance) {
                        eq(files.type, invoiceFileTag),
                        isNull(files.incominginvoice),
                        eq(files.archived, false),
-                        not(isNull(files.path))
+                        not(isNull(files.path)),
+                        ...(fileIds ? [inArray(files.id, fileIds)] : [])
                    )
                )

+            result.filesFound += filesRes.length
+
            if (!filesRes.length) {
                console.log(`No invoice files for tenant ${tenantId}`)
                continue
@@ -150,95 +171,152 @@ export function prepareIncomingInvoices(server: FastifyInstance) {
            // 3️⃣ Strukturierte E-Rechnung bevorzugen, GPT als PDF-Fallback verwenden
            // -------------------------------------------------------------
            for (const file of filesRes) {
-                console.log(`Processing file ${file.id} for tenant ${tenantId}`)
-
-                let fileData: Buffer
-
                try {
-                    fileData = await loadFileBuffer(file.path!)
+                    await processFile(tenantId, file, result)
                } catch (error) {
-                    server.log.error(error, `Datei ${file.id} konnte nicht aus S3 geladen werden.`)
-                    continue
-                }
-
-                const electronicInvoice = await detectElectronicInvoice(fileData, file)
-
-                let itemInfo: any = null
-
-                if (electronicInvoice) {
-                    server.log.info({
-                        fileId: file.id,
-                        container: electronicInvoice.container,
-                        syntax: electronicInvoice.syntax,
-                        attachmentName: electronicInvoice.attachmentName,
-                    }, "Strukturierte E-Rechnung erkannt.")
-
-                    try {
-                        const parsedInvoice = parseElectronicInvoice(electronicInvoice.xml, electronicInvoice.syntax)
-                        const vendor = await findElectronicInvoiceVendor(server, tenantId, parsedInvoice)
-                        itemInfo = mapElectronicInvoiceToIncomingInvoice(
-                            parsedInvoice,
-                            tenantId,
-                            vendor?.id || null,
-                            electronicInvoice.container,
-                            electronicInvoice.attachmentName,
-                        )
-                    } catch (error) {
-                        server.log.error(error, `E-Rechnung aus Datei ${file.id} konnte nicht verarbeitet werden.`)
-
-                        if (electronicInvoice.container === "xml") continue
-                    }
-                }
-
-                if (!itemInfo) {
-                    const data = await getInvoiceDataFromGPT(server, file, tenantId, fileData)
-
-                    if (!data) {
-                        server.log.warn(`GPT returned no data for file ${file.id}`)
+                    if (error instanceof FileAlreadyPreparedError) {
+                        result.skipped.push({ fileId: file.id, reason: "Datei wurde bereits vorbereitet" })
                        continue
                    }
-
-                    itemInfo = mapGptDataToIncomingInvoice(data, tenantId)
+                    server.log.error(error, `Datei ${file.id} konnte nicht vorbereitet werden.`)
+                    result.skipped.push({ fileId: file.id, reason: "Eingangsbeleg konnte nicht angelegt werden" })
                }
+            }
+        }

-                // ---------------------------------------------------------
-                // 4️⃣ IncomingInvoice erstellen
-                // ---------------------------------------------------------
-                const inserted = await server.db
-                    .insert(incominginvoices)
-                    .values(itemInfo)
-                    .returning()
+        return result
+    }

-                const newInvoice = inserted?.[0]
+    const processFile = async (tenantId: number, file: typeof files.$inferSelect, result: IncomingInvoicePreparationResult) => {
+        console.log(`Processing file ${file.id} for tenant ${tenantId}`)

-                if (!newInvoice) {
-                    server.log.error(`Failed to insert incoming invoice for file ${file.id}`)
-                    continue
+        let fileData: Buffer
+
+        try {
+            fileData = await loadFileBuffer(file.path!)
+        } catch (error) {
+            server.log.error(error, `Datei ${file.id} konnte nicht aus S3 geladen werden.`)
+            result.skipped.push({ fileId: file.id, reason: "Datei konnte nicht geladen werden" })
+            return
+        }
+
+        const electronicInvoice = await detectElectronicInvoice(fileData, file)
+
+        let itemInfo: any = null
+
+        if (electronicInvoice) {
+            server.log.info({
+                fileId: file.id,
+                container: electronicInvoice.container,
+                syntax: electronicInvoice.syntax,
+                attachmentName: electronicInvoice.attachmentName,
+            }, "Strukturierte E-Rechnung erkannt.")
+
+            try {
+                const parsedInvoice = parseElectronicInvoice(electronicInvoice.xml, electronicInvoice.syntax)
+                const vendor = await findElectronicInvoiceVendor(server, tenantId, parsedInvoice)
+                itemInfo = mapElectronicInvoiceToIncomingInvoice(
+                    parsedInvoice,
+                    tenantId,
+                    vendor?.id || null,
+                    electronicInvoice.container,
+                    electronicInvoice.attachmentName,
+                )
+            } catch (error) {
+                server.log.error(error, `E-Rechnung aus Datei ${file.id} konnte nicht verarbeitet werden.`)
+
+                if (electronicInvoice.container === "xml") {
+                    result.skipped.push({ fileId: file.id, reason: "E-Rechnung konnte nicht verarbeitet werden" })
+                    return
                }
+            }
+        }

-                // ---------------------------------------------------------
-                // 5️⃣ Datei mit incominginvoice-ID verbinden
-                // ---------------------------------------------------------
-                await server.db
-                    .update(files)
-                    .set({ incominginvoice: newInvoice.id })
-                    .where(eq(files.id, file.id))
+        if (!itemInfo) {
+            const data = await getInvoiceDataFromGPT(server, file, tenantId, fileData)

-                console.log(`IncomingInvoice ${newInvoice.id} created for file ${file.id}`)
+            if (!data) {
+                server.log.warn(`GPT returned no data for file ${file.id}`)
+                result.skipped.push({ fileId: file.id, reason: "Keine Belegdaten erkannt" })
+                return
            }

+            itemInfo = mapGptDataToIncomingInvoice(data, tenantId)
        }

+        // ---------------------------------------------------------
+        // 4️⃣ IncomingInvoice anlegen und Datei atomar verknüpfen.
+        // Die Verknüpfung greift nur, solange die Datei noch frei ist;
+        // sonst wird der Beleg verworfen, damit keine Dubletten entstehen.
+        // ---------------------------------------------------------
+        const newInvoice = await server.db.transaction(async (tx) => {
+            const [invoice] = await tx
+                .insert(incominginvoices)
+                .values(itemInfo)
+                .returning()

-        return
+            if (!invoice) throw new Error("Eingangsbeleg konnte nicht angelegt werden")
+
+            const linked = await tx
+                .update(files)
+                .set({ incominginvoice: invoice.id })
+                .where(and(eq(files.id, file.id), isNull(files.incominginvoice)))
+                .returning({ id: files.id })
+
+            if (!linked.length) throw new FileAlreadyPreparedError()
+
+            return invoice
+        })
+
+        result.created.push({ fileId: file.id, invoiceId: newInvoice.id, source: newInvoice.preparationSource ?? null })
+        console.log(`IncomingInvoice ${newInvoice.id} created for file ${file.id}`)
    }

-    return {
-        run: async (tenant:number) => {
-            await processInvoices(tenant)
+    // Serialize runs per tenant so concurrent triggers cannot prepare the same file twice.
+    const running = new Map<number, Promise<unknown>>()
+    const backgroundRuns = new Map<number, IncomingInvoicePreparationStatus>()
+
+    const run = async (tenant:number, options: { fileIds?: string[] } = {}) => {
+        const previous = running.get(tenant) || Promise.resolve()
+        const current = previous.catch(() => undefined).then(() => processInvoices(tenant, options.fileIds))
+        running.set(tenant, current)
+        try {
+            const result = await current
            console.log("Incoming Invoice Preparation Completed.")
-
+            return result
+        } finally {
+            if (running.get(tenant) === current) running.delete(tenant)
        }
    }

+    const status = (tenant: number): IncomingInvoicePreparationStatus =>
+        backgroundRuns.get(tenant) || { running: false, startedAt: null, finishedAt: null, result: null }
+
+    // Startet die Vorbereitung losgelöst von der Anfrage; ein laufender Vorgang wird nicht erneut gestartet.
+    const start = (tenant: number): IncomingInvoicePreparationStatus => {
+        const current = status(tenant)
+        if (current.running) return current
+
+        const next: IncomingInvoicePreparationStatus = { running: true, startedAt: new Date().toISOString(), finishedAt: null, result: null }
+        backgroundRuns.set(tenant, next)
+
+        run(tenant)
+            .then((result) => {
+                backgroundRuns.set(tenant, { ...next, running: false, finishedAt: new Date().toISOString(), result })
+            })
+            .catch((error) => {
+                server.log.error(error, `Belegvorbereitung für Mandant ${tenant} fehlgeschlagen.`)
+                backgroundRuns.set(tenant, {
+                    ...next,
+                    running: false,
+                    finishedAt: new Date().toISOString(),
+                    result: { filesFound: 0, created: [], skipped: [], error: "Belegvorbereitung fehlgeschlagen" },
+                })
+            })
+
+        return next
+    }
+
+    return { run, start, status }
+
 }
--- a/backend/src/modules/incoming-invoice-cost-centres.service.ts
+++ b/backend/src/modules/incoming-invoice-cost-centres.service.ts
@@ -0,0 +1,126 @@
+import { and, eq, inArray } from "drizzle-orm"
+import { FastifyInstance } from "fastify"
+import { costcentres, incominginvoices } from "../../db/schema"
+import { insertHistoryItem } from "../utils/history"
+
+export type AccountCostCentreAssignment = {
+    index: number
+    costcentre: string | null
+}
+
+export type IncomingInvoiceCostCentreUpdate = {
+    accountCostCentres?: AccountCostCentreAssignment[]
+}
+
+const serviceError = (message: string, statusCode = 400) =>
+    Object.assign(new Error(message), { statusCode })
+const UUID_PATTERN = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i
+
+export function normalizeAccountCostCentreAssignments(input: unknown): AccountCostCentreAssignment[] {
+    if (!Array.isArray(input)) throw serviceError("accountCostCentres muss ein Array sein")
+    if (!input.length) throw serviceError("Mindestens eine Positionskostenstelle ist erforderlich")
+
+    const seen = new Set<number>()
+    return input.map((assignment) => {
+        const index = assignment?.index
+        const costcentre = assignment?.costcentre
+        if (!Number.isInteger(index) || index < 0) throw serviceError("Jede Positionszuordnung benötigt einen gültigen index")
+        if (seen.has(index)) throw serviceError(`Position ${index + 1} ist mehrfach angegeben`)
+        seen.add(index)
+        if (costcentre !== null && (typeof costcentre !== "string" || !UUID_PATTERN.test(costcentre))) {
+            throw serviceError(`Ungültige Kostenstelle für Position ${index + 1}`)
+        }
+        return { index, costcentre }
+    })
+}
+
+export function applyAccountCostCentreAssignments(
+    accounts: unknown,
+    assignments: AccountCostCentreAssignment[] = [],
+) {
+    if (!Array.isArray(accounts)) throw serviceError("Der Eingangsbeleg enthält keine Positionen")
+
+    for (const { index } of assignments) {
+        const account = accounts[index]
+        if (!account || typeof account !== "object" || Array.isArray(account)) {
+            throw serviceError(`Position ${index + 1} wurde im Eingangsbeleg nicht gefunden`)
+        }
+    }
+
+    const assignmentMap = new Map(assignments.map((assignment) => [assignment.index, assignment.costcentre]))
+    return accounts.map((account, index) => {
+        if (!assignmentMap.has(index)) return account
+        const { costcentre: _legacyCostCentre, ...rest } = account as Record<string, unknown>
+        return { ...rest, costCentre: assignmentMap.get(index) ?? null }
+    })
+}
+
+export async function updateIncomingInvoiceCostCentres(
+    server: FastifyInstance,
+    tenantId: number,
+    userId: string,
+    invoiceId: number,
+    input: IncomingInvoiceCostCentreUpdate,
+) {
+    const assignments = normalizeAccountCostCentreAssignments(input?.accountCostCentres)
+
+    const [existing] = await server.db
+        .select()
+        .from(incominginvoices)
+        .where(and(
+            eq(incominginvoices.id, invoiceId),
+            eq(incominginvoices.tenant, tenantId),
+            eq(incominginvoices.archived, false),
+        ))
+        .limit(1)
+
+    if (!existing) throw serviceError("Eingangsbeleg nicht gefunden", 404)
+
+    const referencedCostCentreIds = [...new Set(
+        assignments.map((assignment) => assignment.costcentre).filter((id): id is string => Boolean(id)),
+    )]
+
+    if (referencedCostCentreIds.length) {
+        const validCostCentres = await server.db
+            .select({ id: costcentres.id })
+            .from(costcentres)
+            .where(and(
+                eq(costcentres.tenant, tenantId),
+                eq(costcentres.archived, false),
+                inArray(costcentres.id, referencedCostCentreIds),
+            ))
+
+        if (validCostCentres.length !== referencedCostCentreIds.length) {
+            throw serviceError("Mindestens eine Kostenstelle wurde nicht gefunden oder ist archiviert")
+        }
+    }
+
+    const [updated] = await server.db
+        .update(incominginvoices)
+        .set({
+            accounts: applyAccountCostCentreAssignments(existing.accounts, assignments),
+            updatedAt: new Date(),
+            updatedBy: userId,
+        })
+        .where(and(
+            eq(incominginvoices.id, invoiceId),
+            eq(incominginvoices.tenant, tenantId),
+            eq(incominginvoices.archived, false),
+        ))
+        .returning()
+
+    if (!updated) throw serviceError("Eingangsbeleg nicht gefunden", 404)
+
+    await insertHistoryItem(server, {
+        tenant_id: tenantId,
+        created_by: userId,
+        entity: "incominginvoices",
+        entityId: invoiceId,
+        action: "updated",
+        oldVal: existing,
+        newVal: updated,
+        text: "Kostenstellen des Eingangsbelegs geändert",
+    })
+
+    return updated
+}
--- a/backend/src/routes/banking.ts
+++ b/backend/src/routes/banking.ts
@@ -10,6 +10,7 @@ import { DE_BANK_CODE_TO_BIC } from "../utils/deBankBics"
 import { centralServicesClient } from "../modules/push-server.client"
 import { findBankInstitutionByBic } from "../modules/banking-institution"
 import { normalizeBankAllocationDetails, validateBankAllocationCostCentre } from "../modules/bank-allocation-details"
+import { CASHBOOK_BANK_ID } from "../modules/bank-balances.service"

 import {
    bankrequisitions,
@@ -33,9 +34,7 @@ import {
    desc,
 } from "drizzle-orm"

-
 export default async function bankingRoutes(server: FastifyInstance) {
-    const CASHBOOK_BANK_ID = "fedeo-cashbook"
    const ContraAccounts = aliasedTable(accounts, "contra_accounts")
    const ContraCustomers = aliasedTable(customers, "contra_customers")
    const ContraVendors = aliasedTable(vendors, "contra_vendors")
--- a/backend/src/routes/functions.ts
+++ b/backend/src/routes/functions.ts
@@ -22,6 +22,7 @@ import {citys, files} from "../../db/schema";
 import {and, eq, isNull, not} from "drizzle-orm";
 import {cancelManualGeneration, executeManualGeneration, finishManualGeneration} from "../modules/serialexecution.service";
 import { updateOutgoingDocumentCostCentres } from "../modules/outgoing-document-cost-centres.service";
+import { updateIncomingInvoiceCostCentres } from "../modules/incoming-invoice-cost-centres.service";
 import { s3 } from "../utils/s3";
 import { secrets } from "../utils/secrets";
 import { storeExtractedTextForFile } from "../utils/documentText";
@@ -334,6 +335,26 @@ export default async function functionRoutes(server: FastifyInstance) {
        }
    })

+    server.put('/functions/incoming-invoices/:id/cost-centres', async (req, reply) => {
+        try {
+            const { id } = req.params as { id: string }
+            const invoiceId = Number(id)
+            if (!Number.isFinite(invoiceId)) return reply.code(400).send({ error: "Ungültige Eingangsbeleg-ID" })
+
+            const invoice = await updateIncomingInvoiceCostCentres(
+                server,
+                req.user.tenant_id,
+                req.user.user_id,
+                invoiceId,
+                req.body as any,
+            )
+            return { invoice }
+        } catch (error) {
+            const statusCode = (error as any)?.statusCode || 500
+            return reply.code(statusCode).send({ error: error instanceof Error ? error.message : "Kostenstellen konnten nicht geändert werden" })
+        }
+    })
+
    server.post('/functions/services/bankstatementsync', async (req, reply) => {
        const result = await server.services.bankStatements.run(req.user.tenant_id);
        if (result.errors.length > 0) {
@@ -348,8 +369,11 @@ export default async function functionRoutes(server: FastifyInstance) {
    })

    server.post('/functions/services/prepareincominginvoices', async (req, reply) => {
+        return reply.code(202).send(server.services.prepareIncomingInvoices.start(req.user.tenant_id))
+    })

-        await server.services.prepareIncomingInvoices.run(req.user.tenant_id)
+    server.get('/functions/services/prepareincominginvoices', async (req) => {
+        return server.services.prepareIncomingInvoices.status(req.user.tenant_id)
    })

    server.get('/functions/liquidity-forecast', async (req, reply) => {
--- a/backend/src/routes/mcp.ts
+++ b/backend/src/routes/mcp.ts
@@ -11,6 +11,11 @@ import { s3 } from "../utils/s3"
 import { secrets } from "../utils/secrets"
 import { GetObjectCommand } from "@aws-sdk/client-s3"
 import { sanitizeFilename } from "../utils/filename"
+import multipart from "@fastify/multipart"
+import { MCP_FILE_LIMIT } from "../mcp/documentFiles"
+import { parseUploadQuery, storeMcpFileUpload } from "../mcp/fileUploads"
+
+const RAW_UPLOAD_TYPES = ["application/pdf", "application/octet-stream", "application/xml", "text/xml", "image/jpeg", "image/png", "image/tiff"]

 const SUPPORTED_PROTOCOL_VERSIONS = [
    "2025-11-25",
@@ -62,7 +67,13 @@ const requireMcpTokenManagementPermission = (req: any) => {
    throw Object.assign(new Error("Fehlende Berechtigung: mcp.tokens.write"), { statusCode: 403 })
 }

-export default async function mcpRoutes(server: FastifyInstance) {
+type McpRouteOptions = {
+    /** Replaceable in tests to avoid object storage. */
+    storeUpload?: typeof storeMcpFileUpload
+}
+
+export default async function mcpRoutes(server: FastifyInstance, options: McpRouteOptions = {}) {
+    const storeUpload = options.storeUpload || storeMcpFileUpload
    server.get("/mcp/tokens", async (req, reply) => {
        try {
            requireMcpTokenManagementPermission(req)
@@ -221,6 +232,37 @@ export default async function mcpRoutes(server: FastifyInstance) {
        }
    })

+    // Binary uploads without Base64; parsers stay scoped so JSON-RPC parsing is unaffected.
+    await server.register(async (uploads) => {
+        await uploads.register(multipart, { limits: { fileSize: MCP_FILE_LIMIT, files: 1 } })
+        uploads.addContentTypeParser(RAW_UPLOAD_TYPES, { parseAs: "buffer", bodyLimit: MCP_FILE_LIMIT }, (_req, body, done) => done(null, body))
+
+        uploads.post("/mcp/files", async (req, reply) => {
+            try {
+                const context = await createMcpContext(server, req)
+                const query = parseUploadQuery(req.query as Record<string, unknown>)
+                let body: Buffer
+                let filename = query.filename
+                let mimeType = req.headers["content-type"]?.split(";")[0].trim() || null
+                if (req.isMultipart()) {
+                    const part = await req.file()
+                    if (!part || part.fieldname !== "file") return reply.code(400).send({ error: "Bitte die Datei im Feld file übertragen." })
+                    body = await part.toBuffer()
+                    filename ||= part.filename
+                    mimeType = part.mimetype
+                } else if (Buffer.isBuffer(req.body)) {
+                    body = req.body
+                } else {
+                    return reply.code(415).send({ error: `Bitte multipart/form-data oder einen der Content-Types ${RAW_UPLOAD_TYPES.join(", ")} verwenden.` })
+                }
+                if (!filename) return reply.code(400).send({ error: "filename ist erforderlich." })
+                return await storeUpload(context, { ...query, filename, body, mimeType })
+            } catch (error) {
+                return reply.code((error as any)?.statusCode || 400).send({ error: error instanceof Error ? error.message : "Upload fehlgeschlagen." })
+            }
+        })
+    })
+
    server.post("/mcp", { bodyLimit: MCP_BODY_LIMIT }, async (req, reply) => {
        const body = req.body as JsonRpcRequest | JsonRpcRequest[]
        const requests = Array.isArray(body) ? body : [body]
@@ -270,7 +312,7 @@ export default async function mcpRoutes(server: FastifyInstance) {
                        description: tool.description,
                        inputSchema: tool.inputSchema,
                        annotations: {
-                            readOnlyHint: !tool.requiredPermissions.some((permission) => permission.endsWith(".write")),
+                            readOnlyHint: tool.readOnly ?? !tool.requiredPermissions.some((permission) => permission.endsWith(".write")),
                        },
                    })),
                }))
--- a/backend/src/utils/history.ts
+++ b/backend/src/utils/history.ts
@@ -50,7 +50,7 @@ export async function insertHistoryItem(
        created_by: string | null
        entity: string
        entityId: string | number
-        action: "created" | "updated" | "unchanged" | "deleted" | "archived"
+        action: "created" | "updated" | "unchanged" | "deleted" | "archived" | "restored"
        oldVal?: any
        newVal?: any
        text?: string
@@ -62,6 +62,7 @@ export async function insertHistoryItem(
        updated: `Eintrag in ${entityLabel} geändert`,
        unchanged: `Eintrag in ${entityLabel} unverändert`,
        archived: `Eintrag in ${entityLabel} archiviert`,
+        restored: `Eintrag in ${entityLabel} wiederhergestellt`,
        deleted: `Eintrag in ${entityLabel} gelöscht`
    }

--- a/backend/tests/bankBalances.test.ts
+++ b/backend/tests/bankBalances.test.ts
@@ -0,0 +1,24 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+import { calculateAccountBalance, CASHBOOK_BANK_ID } from "../src/modules/bank-balances.service"
+
+const syncedAt = new Date("2026-10-20T08:00:00Z")
+const bank = { id: 1, name: "Giro", iban: "DE00", ownerName: null, bankId: "bank", datevNumber: "1200", balance: 1000.1, expired: false, syncedAt }
+const cashbook = { ...bank, id: 2, name: "Kasse", iban: "CASH-1", bankId: CASHBOOK_BANK_ID, datevNumber: "1000", balance: 50 }
+
+test("bank accounts report the synced balance and revert later statements for a past date", () => {
+    assert.equal(calculateAccountBalance(bank, 0, null).balance, 1000.1)
+    assert.equal(calculateAccountBalance(bank, 0, null).source, "bank_sync")
+    const past = calculateAccountBalance(bank, -200.05, "2026-10-01")
+    assert.equal(past.balance, 1200.15)
+    assert.equal(past.syncedBalance, 1000.1)
+    assert.equal(past.source, "bank_sync_reconstructed")
+})
+
+test("cashbooks add their bookings to the opening balance", () => {
+    const result = calculateAccountBalance(cashbook, 12.345, null)
+    assert.equal(result.type, "cashbook")
+    assert.equal(result.balance, 62.35)
+    assert.equal(result.openingBalance, 50)
+    assert.equal(result.iban, null)
+})
--- a/backend/tests/incomingInvoiceCostCentres.test.ts
+++ b/backend/tests/incomingInvoiceCostCentres.test.ts
@@ -0,0 +1,48 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+import {
+    applyAccountCostCentreAssignments,
+    normalizeAccountCostCentreAssignments,
+} from "../src/modules/incoming-invoice-cost-centres.service"
+import { mcpToolMap } from "../src/mcp/registry"
+
+const CENTRE = "8f1c2b3a-4d5e-4f60-8a7b-9c0d1e2f3a4b"
+
+test("changes only requested account cost centres", () => {
+    const accounts = [
+        { account: 1, amountNet: 100, taxType: "19", costCentre: "old-1" },
+        { account: 2, amountNet: 50, taxType: "7", costCentre: "old-2" },
+    ]
+
+    assert.deepEqual(applyAccountCostCentreAssignments(accounts, [
+        { index: 1, costcentre: CENTRE },
+    ]), [
+        accounts[0],
+        { account: 2, amountNet: 50, taxType: "7", costCentre: CENTRE },
+    ])
+})
+
+test("rejects assignments for unknown invoice positions", () => {
+    assert.throws(
+        () => applyAccountCostCentreAssignments([{ account: 1 }], [{ index: 3, costcentre: null }]),
+        /Position 4.*nicht gefunden/,
+    )
+})
+
+test("validates cost centre assignments", () => {
+    assert.throws(() => normalizeAccountCostCentreAssignments([]), /Mindestens eine/)
+    assert.throws(() => normalizeAccountCostCentreAssignments([{ index: -1, costcentre: null }]), /gültigen index/)
+    assert.throws(() => normalizeAccountCostCentreAssignments([{ index: 0, costcentre: "x" }]), /Ungültige Kostenstelle/)
+    assert.throws(
+        () => normalizeAccountCostCentreAssignments([{ index: 0, costcentre: null }, { index: 0, costcentre: CENTRE }]),
+        /mehrfach/,
+    )
+    assert.deepEqual(normalizeAccountCostCentreAssignments([{ index: 0, costcentre: CENTRE }]), [{ index: 0, costcentre: CENTRE }])
+})
+
+test("registers a dedicated incoming invoice cost centre tool", () => {
+    const tool = mcpToolMap.get("accounting.incoming_invoices.cost_centres.update")
+
+    assert.deepEqual(tool?.requiredPermissions, ["accounting.incoming_invoices.write"])
+    assert.deepEqual(tool?.inputSchema.required, ["id", "accountCostCentres"])
+})
--- a/backend/tests/incomingInvoicePreparation.test.ts
+++ b/backend/tests/incomingInvoicePreparation.test.ts
@@ -0,0 +1,45 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+import { prepareIncomingInvoices } from "../src/modules/cron/prepareIncomingInvoices"
+
+function server(tenantLookups: { count: number }) {
+    let release: () => void = () => undefined
+    const gate = new Promise<void>((resolve) => { release = resolve })
+    const db: any = {
+        select: () => ({
+            from: () => ({
+                where: () => ({
+                    orderBy: async () => {
+                        tenantLookups.count += 1
+                        await gate
+                        return []
+                    },
+                }),
+            }),
+        }),
+    }
+    const log = { error: () => undefined, info: () => undefined, warn: () => undefined }
+    return { server: { db, log } as any, release: () => release() }
+}
+
+test("start runs the preparation in the background and does not start a second run", async () => {
+    const lookups = { count: 0 }
+    const { server: srv, release } = server(lookups)
+    const service = prepareIncomingInvoices(srv)
+
+    const first = service.start(7)
+    const second = service.start(7)
+    assert.equal(first.running, true)
+    assert.equal(second.startedAt, first.startedAt)
+    assert.equal(service.status(8).running, false)
+
+    release()
+    await new Promise((resolve) => setImmediate(resolve))
+    await new Promise((resolve) => setImmediate(resolve))
+
+    const status = service.status(7)
+    assert.equal(lookups.count, 1)
+    assert.equal(status.running, false)
+    assert.ok(status.finishedAt)
+    assert.equal(status.result?.error, "Mandant nicht gefunden")
+})
--- a/backend/tests/mcpArchiveRestore.test.ts
+++ b/backend/tests/mcpArchiveRestore.test.ts
@@ -0,0 +1,99 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+import { getTableColumns, getTableName } from "drizzle-orm"
+import { PgDialect } from "drizzle-orm/pg-core"
+import * as schema from "../db/schema"
+import { mcpToolMap } from "../src/mcp/registry"
+import { archiveEntities, prepareArchiveRestoreInput } from "../src/mcp/tools/archive"
+import { asToolResult } from "../src/mcp/result"
+
+const tenantId = 7
+const userId = "00000000-0000-4000-8000-000000000001"
+const uuid = "00000000-0000-4000-8000-000000000002"
+const dialect = new PgDialect()
+
+/** Minimal Drizzle stand-in which evaluates equality predicates, including tenant filters. */
+function fixture(initial: Record<string, any[]> = {}, listRows: any[] = []) {
+    const state = structuredClone(initial)
+    const rowsFor = (table: any) => state[getTableName(table)] ||= []
+    const matches = (table: any, where: any, row: any) => {
+        const query = dialect.sqlToQuery(where)
+        const columns = getTableColumns(table) as Record<string, any>
+        const keyFor = (name: string) => Object.keys(columns).find((key) => columns[key].name === name)!
+        return [...query.sql.matchAll(/"\w+"\."(\w+)" = \$(\d+)/g)]
+            .every((match) => row[keyFor(match[1])] === query.params[Number(match[2]) - 1])
+    }
+    const listed: string[] = []
+    const db: any = {
+        transaction: async (callback: any) => callback(db),
+        select: () => ({ from: (table: any) => {
+            let condition: any
+            const query: any = {
+                where: (where: any) => { condition = where; return query },
+                orderBy: () => query,
+                offset: () => query,
+                limit: () => query,
+                for: () => query,
+                then: (resolve: any, reject: any) => Promise.resolve().then(() => {
+                    if (listRows.length) { listed.push(dialect.sqlToQuery(condition).sql); return listRows }
+                    return rowsFor(table).filter((row) => matches(table, condition, row)).map((row) => ({ ...row }))
+                }).then(resolve, reject),
+            }
+            return query
+        } }),
+        insert: (table: any) => ({ values: async (data: any) => { rowsFor(table).push(data) } }),
+        update: (table: any) => ({ set: (data: any) => ({ where: (where: any) => ({
+            returning: async () => rowsFor(table).filter((row) => matches(table, where, row)).map((row) => ({ ...Object.assign(row, data) })),
+        }) }) }),
+    }
+    const context: any = { server: { db, log: { warn: () => undefined } }, tenantId, userId, isAdmin: true, permissions: [] }
+    return { context, rows: rowsFor, listed }
+}
+const call = async (context: any, name: string, args: Record<string, any>) => await mcpToolMap.get(`archive.entities.${name}`)!.handler(context, args) as any
+
+for (const [key, entity] of Object.entries(archiveEntities)) {
+    test(`${key}: restore unarchives within the tenant and records history`, async () => {
+        const id = entity.uuid ? uuid : 1
+        const f = fixture({
+            [getTableName(entity.table)]: [{ id, tenant: tenantId, archived: true }],
+            // Restoring documents requires an internal (non-portal) profile.
+            auth_profiles: [{ tenant_id: tenantId, user_id: userId, customer_for_portal: null }],
+        })
+        const result = await call(f.context, "restore", { entity: key, id })
+        assert.deepEqual(asToolResult(result).structuredContent?.success, true)
+        assert.equal(result.record.archived, undefined)
+        const [row] = f.rows(entity.table)
+        assert.equal(row.archived, false)
+        assert.equal(row.updatedBy ?? row.updated_by, userId)
+        await assert.rejects(call(f.context, "restore", { entity: key, id }), /nicht archiviert/)
+    })
+}
+
+test("restore rejects foreign tenants, unknown entities, invalid IDs and missing write permission", async () => {
+    const f = fixture({ customers: [{ id: 1, tenant: 8, archived: true }], tasks: [{ id: 2, tenant: tenantId, archived: true }] })
+    await assert.rejects(call(f.context, "restore", { entity: "customers", id: 1 }), /nicht gefunden/)
+    assert.equal(f.rows(schema.customers)[0].archived, true)
+    await assert.rejects(call(f.context, "restore", { entity: "accounts", id: 1 }), /unbekannte Entität/)
+    assert.throws(() => prepareArchiveRestoreInput({ entity: "cost_centres", id: 1 }), /UUID/)
+    assert.throws(() => prepareArchiveRestoreInput({ entity: "tasks", id: "abc" }), /ganze Zahl/)
+    f.context.isAdmin = false
+    f.context.permissions = ["organisation.tasks.read"]
+    await assert.rejects(call(f.context, "restore", { entity: "tasks", id: 2 }), /Fehlende Berechtigung.*organisation\.tasks\.write/)
+    f.context.permissions.push("organisation.tasks.write")
+    await call(f.context, "restore", { entity: "tasks", id: 2 })
+    assert.equal(f.rows(schema.tasks)[0].archived, false)
+})
+
+test("list returns archived rows visibly and requires the read permission", async () => {
+    const f = fixture({}, [{ id: 1, tenant: tenantId, archived: true, name: "Alt" }])
+    const result = asToolResult(await call(f.context, "list", { entity: "customers", search: "Al" }))
+    assert.deepEqual(result.structuredContent?.rows, [{ id: 1, tenant: tenantId, name: "Alt", isArchived: true }])
+    assert.match(f.listed[0], /"customers"\."archived" = \$2/)
+    f.context.isAdmin = false
+    f.context.permissions = []
+    await assert.rejects(call(f.context, "list", { entity: "customers" }), /masterdata\.customers\.read/)
+})
+
+test("restore is advertised as a write tool", () => {
+    assert.equal(mcpToolMap.get("archive.entities.restore")!.readOnly, false)
+})
--- a/backend/tests/mcpFileUploads.test.ts
+++ b/backend/tests/mcpFileUploads.test.ts
@@ -0,0 +1,106 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+import { createHash } from "node:crypto"
+import Fastify from "fastify"
+import { drizzle } from "drizzle-orm/pg-proxy"
+import mcpRoutes from "../src/routes/mcp"
+import authPlugin from "../src/plugins/auth"
+import { mcpToolMap } from "../src/mcp/registry"
+import { parseUploadQuery, storeMcpFileUpload } from "../src/mcp/fileUploads"
+import { MCP_FILE_LIMIT } from "../src/mcp/documentFiles"
+import { secrets } from "../src/utils/secrets"
+
+const id = "00000000-0000-4000-8000-000000000001"
+const pdf = Buffer.from("%PDF-1.7\nMCP fixture\n%%EOF")
+const bearer = "fedeo_mcp_test_upload_token"
+const headers = { authorization: `Bearer ${bearer}` }
+
+async function app(t: any) {
+    const uploads: any[] = []
+    const db = drizzle(async (sql, params) => {
+        if (sql.includes('from "m2m_api_keys"')) {
+            assert.ok(params.includes(createHash("sha256").update(bearer).digest("hex")))
+            return { rows: [[id, 7, id, true, null, "test@example.invalid", true]] }
+        }
+        if (sql.startsWith('update "m2m_api_keys"')) return { rows: [] }
+        if (sql.includes('from "auth_users"')) return { rows: [[true]] }
+        if (sql.includes('from "tenants"')) return { rows: [[null, null]] }
+        return { rows: [] }
+    })
+    const server = Fastify()
+    t.after(() => server.close())
+    server.decorate("db", db as any)
+    await server.register(authPlugin)
+    await server.register(mcpRoutes, {
+        prefix: "/api",
+        storeUpload: async (context: any, upload: any) => { uploads.push({ tenantId: context.tenantId, ...upload }); return { stored: true } },
+    })
+    return { server, uploads }
+}
+
+const multipartBody = (filename: string, content: Buffer, field = "file") => {
+    const boundary = "----fedeo-test"
+    const payload = Buffer.concat([
+        Buffer.from(`--${boundary}\r\nContent-Disposition: form-data; name="${field}"; filename="${filename}"\r\nContent-Type: application/pdf\r\n\r\n`),
+        content,
+        Buffer.from(`\r\n--${boundary}--\r\n`),
+    ])
+    return { payload, headers: { ...headers, "content-type": `multipart/form-data; boundary=${boundary}` } }
+}
+
+test("binary endpoint accepts multipart and raw uploads without Base64", async (t) => {
+    const { server, uploads } = await app(t)
+    const multipart = multipartBody("rechnung.pdf", pdf)
+    const first = await server.inject({ method: "POST", url: "/api/mcp/files?target=incoming_invoice&invoiceId=5&prepare=false", ...multipart })
+    assert.equal(first.statusCode, 200, first.body)
+    assert.deepEqual(first.json(), { stored: true })
+    assert.equal(uploads[0].tenantId, 7)
+    assert.equal(uploads[0].target, "incoming_invoice")
+    assert.equal(uploads[0].filename, "rechnung.pdf")
+    assert.equal(uploads[0].invoiceId, 5)
+    assert.equal(uploads[0].prepare, false)
+    assert.deepEqual(uploads[0].body, pdf)
+
+    const raw = await server.inject({ method: "POST", url: "/api/mcp/files?filename=scan.pdf", headers: { ...headers, "content-type": "application/pdf" }, payload: pdf })
+    assert.equal(raw.statusCode, 200, raw.body)
+    assert.equal(uploads[1].target, "inbox")
+    assert.equal(uploads[1].mimeType, "application/pdf")
+    assert.deepEqual(uploads[1].body, pdf)
+})
+
+test("binary endpoint rejects missing auth, filenames, wrong fields, types and oversized files", async (t) => {
+    const { server, uploads } = await app(t)
+    const raw = { "content-type": "application/pdf" }
+    assert.equal((await server.inject({ method: "POST", url: "/api/mcp/files?filename=a.pdf", headers: raw, payload: pdf })).statusCode, 401)
+    assert.equal((await server.inject({ method: "POST", url: "/api/mcp/files", headers: { ...headers, ...raw }, payload: pdf })).statusCode, 400)
+    assert.equal((await server.inject({ method: "POST", url: "/api/mcp/files?filename=a.pdf", ...multipartBody("a.pdf", pdf, "other") })).statusCode, 400)
+    assert.equal((await server.inject({ method: "POST", url: "/api/mcp/files?filename=a.pdf", headers: { ...headers, "content-type": "text/html" }, payload: "<p>" })).statusCode, 415)
+    assert.equal((await server.inject({ method: "POST", url: "/api/mcp/files?filename=a.pdf&target=wiki", headers: { ...headers, ...raw }, payload: pdf })).statusCode, 400)
+    const tooLarge = Buffer.alloc(MCP_FILE_LIMIT + 1)
+    assert.equal((await server.inject({ method: "POST", url: "/api/mcp/files?filename=a.pdf", headers: { ...headers, ...raw }, payload: tooLarge })).statusCode, 413)
+    assert.equal((await server.inject({ method: "POST", url: "/api/mcp/files", ...multipartBody("a.pdf", tooLarge) })).statusCode, 413)
+    assert.equal(uploads.length, 0)
+})
+
+test("query parsing keeps invoice options to the incoming invoice target", () => {
+    assert.deepEqual(parseUploadQuery({}), { target: "inbox", invoiceId: null, prepare: true, filename: null })
+    assert.throws(() => parseUploadQuery({ invoiceId: "3" }), /nur für target=incoming_invoice/)
+    assert.throws(() => parseUploadQuery({ target: "incoming_invoice", invoiceId: "x" }), /positive ganze Zahl/)
+    assert.throws(() => parseUploadQuery({ target: "incoming_invoice", prepare: "ja" }), /true oder false/)
+})
+
+test("stored uploads require the permission of the chosen target", async () => {
+    const context: any = { server: { db: null }, tenantId: 7, userId: id, isAdmin: false, permissions: ["documents.read"] }
+    await assert.rejects(storeMcpFileUpload(context, { target: "inbox", filename: "a.pdf", body: pdf }), /documents\.write/)
+    await assert.rejects(storeMcpFileUpload(context, { target: "incoming_invoice", filename: "a.pdf", body: pdf }), /accounting\.incoming_invoices\.write/)
+    await assert.rejects(storeMcpFileUpload(context, { target: "inbox", filename: "a.pdf", body: Buffer.alloc(0) }), /leer/)
+})
+
+test("upload_url tool returns the absolute endpoint with examples", async (t) => {
+    const apiBase = secrets.API_BASE_URL
+    secrets.API_BASE_URL = "https://app.fedeo.test/backend/"
+    t.after(() => { secrets.API_BASE_URL = apiBase })
+    const result: any = await mcpToolMap.get("documents.files.upload_url")!.handler({} as any, {})
+    assert.equal(result.url, "https://app.fedeo.test/backend/api/mcp/files")
+    assert.match(result.examples[0], /-F "file=@rechnung\.pdf"/)
+})
--- a/backend/tests/mcpIncomingInvoicePreparation.test.ts
+++ b/backend/tests/mcpIncomingInvoicePreparation.test.ts
@@ -0,0 +1,41 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+import { mcpToolMap } from "../src/mcp/registry"
+
+const fileA = "00000000-0000-4000-8000-00000000000a"
+const fileB = "00000000-0000-4000-8000-00000000000b"
+const tool = mcpToolMap.get("accounting.incoming_invoices.prepare")!
+
+function context(result: any, invoices: any[] = []) {
+    const calls: any[] = []
+    const db: any = {
+        select: () => ({ from: () => ({ where: async () => invoices }) }),
+    }
+    const services = { prepareIncomingInvoices: { run: async (tenantId: number, options: any) => { calls.push({ tenantId, options }); return result } } }
+    return { calls, context: { server: { db, services }, tenantId: 7, userId: "user", isAdmin: true, permissions: [] } as any }
+}
+
+test("prepare runs for the active tenant and returns created drafts with validation", async () => {
+    const invoice = { id: 11, tenant: 7, state: "Entwurf", archived: false }
+    const { calls, context: ctx } = context({ filesFound: 1, created: [{ fileId: fileA, invoiceId: 11, source: "gpt" }], skipped: [] }, [invoice])
+    const result: any = await tool.handler(ctx, {})
+    assert.deepEqual(calls, [{ tenantId: 7, options: { fileIds: undefined } }])
+    assert.equal(result.created[0].invoice.id, 11)
+    assert.ok(result.created[0].validation)
+    assert.deepEqual(result.skipped, [])
+})
+
+test("prepare limits to given files and reports files it could not handle", async () => {
+    const { calls, context: ctx } = context({ filesFound: 1, created: [], skipped: [{ fileId: fileA, reason: "Keine Belegdaten erkannt" }] })
+    const result: any = await tool.handler(ctx, { fileIds: [fileA, fileB.toUpperCase(), fileB] })
+    assert.deepEqual(calls[0].options.fileIds, [fileA, fileB])
+    assert.deepEqual(result.skipped.map((entry: any) => entry.fileId), [fileA, fileB])
+})
+
+test("prepare validates input and surfaces tenant configuration errors", async () => {
+    const { context: ctx } = context({ filesFound: 0, created: [], skipped: [], error: "Dateityp für Eingangsrechnungen fehlt" })
+    await assert.rejects(tool.handler(ctx, { fileIds: [] }), /1 bis 50/)
+    await assert.rejects(tool.handler(ctx, { fileIds: ["abc"] }), /UUID/)
+    await assert.rejects(tool.handler(ctx, {}), /Dateityp für Eingangsrechnungen fehlt/)
+    assert.deepEqual(tool.requiredPermissions, ["accounting.incoming_invoices.write"])
+})
--- a/backend/tests/mcpPagination.test.ts
+++ b/backend/tests/mcpPagination.test.ts
@@ -40,11 +40,12 @@ for (const tool of mcpTools.filter((tool) => (tool.inputSchema.properties as any
                return values
            }) }
        }, { schema })
-        const context = { server: { db }, tenantId: 7, userId: "test" } as any
+        const context = { server: { db }, tenantId: 7, userId: "test", isAdmin: true } as any
+        const properties = tool.inputSchema.properties as any
        const ids: unknown[] = []
        let offset = 0
        for (let page = 0; page < 3; page++) {
-            const result: any = await tool.handler(context, { ...((tool.inputSchema.properties as any).id ? { id: 1 } : {}), limit: 100, offset })
+            const result: any = await tool.handler(context, { ...(properties.id ? { id: 1 } : {}), ...(properties.entity ? { entity: properties.entity.enum[0] } : {}), limit: 100, offset })
            assert.equal(result.rows.length, page < 2 ? 100 : 5)
            assert.equal(result.pagination.hasMore, page < 2)
            assert.equal(result.pagination.nextOffset, page < 2 ? offset + 100 : null)
--- a/frontend/pages/createDocument/edit/[[id]].vue
+++ b/frontend/pages/createDocument/edit/[[id]].vue
@@ -730,6 +730,12 @@ const setupPage = async () => {
    await router.replace('/createDocument')
    return
  }
+
+  if (route.query.regeneratePdf && route.params.id) {
+    await regenerateMissingPdf()
+    return
+  }
+
  loaded.value = true

 }
@@ -1980,38 +1986,7 @@ const closeDocument = async () => {

    await saveDocument("Gebucht")

-    await generateDocument()
-
-    let fileData = {}
-
-    fileData.project = itemInfo.value.project
-    fileData.createddocument = itemInfo.value.id
-
-    let mappedType = documentStorageFallbackTypes[itemInfo.value.type] || itemInfo.value.type
-
-    const folders = await useEntities("folders").select()
-    console.log(folders)
-    fileData.folder = folders.find(i => i.function === mappedType && i.year === Number(dayjs().format("YYYY"))).id
-
-    const tags = await useEntities("filetags").select()
-    console.log(tags)
-    fileData.type = tags.find(i => i.createdDocumentType === mappedType).id
-
-    function dataURLtoFile(dataurl, filename) {
-      var arr = dataurl.split(","),
-          mime = arr[0].match(/:(.*?);/)[1],
-          bstr = atob(arr[arr.length - 1]),
-          n = bstr.length,
-          u8arr = new Uint8Array(n);
-      while (n--) {
-        u8arr[n] = bstr.charCodeAt(n);
-      }
-      return new File([u8arr], filename, {type: mime});
-    }
-
-    let file = dataURLtoFile(uri.value, `${itemInfo.value.documentNumber}.pdf`)
-
-    await useFiles().uploadFiles(fileData, [file])
+    await uploadGeneratedDocument()

    guard.value = false

@@ -2021,6 +1996,77 @@ const closeDocument = async () => {



+}
+
+// Erzeugt die PDF aus dem aktuellen Stand und hängt sie an den Beleg an, ohne den Datensatz zu speichern
+const uploadGeneratedDocument = async () => {
+  await generateDocument()
+
+  if (!uri.value) throw new Error("PDF konnte nicht erzeugt werden")
+
+  let fileData = {}
+
+  fileData.project = itemInfo.value.project
+  fileData.createddocument = itemInfo.value.id
+
+  let mappedType = documentStorageFallbackTypes[itemInfo.value.type] || itemInfo.value.type
+
+  const folders = await useEntities("folders").select()
+  console.log(folders)
+  fileData.folder = folders.find(i => i.function === mappedType && i.year === Number(dayjs().format("YYYY"))).id
+
+  const tags = await useEntities("filetags").select()
+  console.log(tags)
+  fileData.type = tags.find(i => i.createdDocumentType === mappedType).id
+
+  function dataURLtoFile(dataurl, filename) {
+    var arr = dataurl.split(","),
+        mime = arr[0].match(/:(.*?);/)[1],
+        bstr = atob(arr[arr.length - 1]),
+        n = bstr.length,
+        u8arr = new Uint8Array(n);
+    while (n--) {
+      u8arr[n] = bstr.charCodeAt(n);
+    }
+    return new File([u8arr], filename, {type: mime});
+  }
+
+  let file = dataURLtoFile(uri.value, `${itemInfo.value.documentNumber}.pdf`)
+
+  await useFiles().uploadFiles(fileData, [file])
+}
+
+const regenerateMissingPdf = async () => {
+  guard.value = false
+  const showPath = `/createDocument/show/${route.params.id}`
+
+  try {
+    const document = await useEntities("createddocuments").selectSingle(route.params.id, "*,files(*)")
+
+    if (document?.state === "Entwurf" || document?.type === "serialInvoices") {
+      toast.add({ title: "PDF kann nur für fertiggestellte Belege nacherzeugt werden", color: "error" })
+    } else if ((document?.files || []).length > 0) {
+      toast.add({ title: "Am Beleg ist bereits ein Dokument angehängt", color: "warning" })
+    } else {
+      // Vertrags- und Mandats-Watcher überschreiben beim Laden die Zahlungsdaten, für die PDF gilt der gespeicherte Stand
+      const restoreStoredPaymentData = () => {
+        itemInfo.value.payment_type = document.payment_type
+        itemInfo.value.outgoingsepamandate = normalizeEntityId(document.outgoingsepamandate)
+      }
+      await nextTick()
+      restoreStoredPaymentData()
+      await nextTick()
+      restoreStoredPaymentData()
+
+      await uploadGeneratedDocument()
+      toast.add({ title: "PDF nacherzeugt", color: "success" })
+    }
+  } catch (error) {
+    console.error(error)
+    toast.add({ title: "PDF konnte nicht nacherzeugt werden", description: error?.data?.error || error?.message, color: "error" })
+  }
+
+  await router.replace(showPath)
 }

 const getTextTemplateByType = (type, pos) => {
--- a/frontend/pages/createDocument/show/[id].vue
+++ b/frontend/pages/createDocument/show/[id].vue
@@ -110,10 +110,18 @@ const setupPage = async () => {
      links.value = createddocuments.filter(i => i.createddocument?.id === itemInfo.value.id)
    }

-    linkedDocument.value = await useFiles().selectDocument(itemInfo.value.files[0].id)
+    if (itemInfo.value.files?.length > 0) {
+      linkedDocument.value = await useFiles().selectDocument(itemInfo.value.files[0].id)
+    }
  }
 }

+const canRegeneratePdf = computed(() => itemInfo.value.id
+    && itemInfo.value.state !== 'Entwurf'
+    && itemInfo.value.type !== 'serialInvoices'
+    && Array.isArray(itemInfo.value.files)
+    && itemInfo.value.files.length === 0)
+
 setupPage()

 const getStatementLike = (allocation) => allocation?.bankstatement || (typeof allocation?.bs_id === "object" ? allocation.bs_id : null)
@@ -282,6 +290,12 @@ const togglePortalRelease = async () => {
          :loading="costCentresLoading"
          @click="openCostCentres"
      >Kostenstellen bearbeiten</UButton>
+      <UButton
+          v-if="canRegeneratePdf"
+          icon="i-heroicons-document-arrow-down"
+          variant="outline"
+          @click="router.push(`/createDocument/edit/${itemInfo.id}?regeneratePdf=1`)"
+      >PDF nacherzeugen</UButton>
      <!--      <UButton
                :to="dataStore.documents.find(i => i.createdDocument === itemInfo.id) ? dataStore.documents.find(i => i.createdDocument === itemInfo.id).url : ''"
                target="_blank"
--- a/frontend/pages/incomingInvoices/[mode]/[id].vue
+++ b/frontend/pages/incomingInvoices/[mode]/[id].vue
@@ -200,6 +200,47 @@ const getAccountLabel = (item) => {
  return account ? `${account.number || ""} ${account.label || ""}`.trim() : "-"
 }
 const getCostCentreLabel = (item) => costcentres.value.find((costcentre) => costcentre.id === item.costCentre)?.name || "-"
+
+const canEditCostCentres = computed(() => mode.value === "show" && Boolean(itemInfo.value.id) && !itemInfo.value.archived)
+const costCentresOpen = ref(false)
+const costCentresSaving = ref(false)
+const costCentreDraft = ref([])
+const costCentreOptionLabel = (id) => {
+  const centre = costcentres.value.find((item) => item.id === id)
+  return centre ? [centre.number, centre.name].filter(Boolean).join(" - ") : (id ? "Bisherige Kostenstelle" : "Keine Kostenstelle")
+}
+
+const openCostCentres = () => {
+  costCentreDraft.value = (itemInfo.value.accounts || []).map((account, index) => ({
+    index,
+    label: `${index + 1}. ${account.description || getAccountLabel(account)}`,
+    costcentre: account.costCentre || null,
+  }))
+  costCentresOpen.value = true
+}
+
+const saveCostCentres = async () => {
+  if (costCentresSaving.value) return
+  costCentresSaving.value = true
+  try {
+    const accountCostCentres = costCentreDraft.value
+        .filter((row) => row.costcentre !== (itemInfo.value.accounts[row.index]?.costCentre || null))
+        .map(({ index, costcentre }) => ({ index, costcentre }))
+    if (accountCostCentres.length) {
+      const { invoice } = await useNuxtApp().$api(`/api/functions/incoming-invoices/${itemInfo.value.id}/cost-centres`, {
+        method: "PUT",
+        body: { accountCostCentres },
+      })
+      itemInfo.value.accounts = normalizeIncomingInvoiceAccounts(invoice.accounts || [], invoice.date)
+      toast.add({ title: "Kostenstellen gespeichert", color: "success" })
+    }
+    costCentresOpen.value = false
+  } catch (error) {
+    toast.add({ title: "Kostenstellen konnten nicht gespeichert werden", description: error?.data?.error || "Bitte versuche es erneut.", color: "error" })
+  } finally {
+    costCentresSaving.value = false
+  }
+}
 const getBookingModeLabel = (item) => EXPENSE_BOOKING_MODE_ITEMS.find((mode) => mode.value === item.bookingMode)?.label || "-"
 const getTaxLabel = (item) => taxOptions.value.find((tax) => tax.key === item.taxType)?.label || "-"

@@ -362,6 +403,14 @@ const hasBlockingIncomingInvoiceErrors = computed(() => blockingIncomingInvoiceE
      >
        Bearbeiten
      </UButton>
+      <UButton
+          v-if="canEditCostCentres"
+          icon="i-heroicons-tag"
+          variant="outline"
+          @click="openCostCentres"
+      >
+        Kostenstellen bearbeiten
+      </UButton>
      <ArchiveButton
          v-if="canArchiveIncomingInvoice"
          color="error"
@@ -1060,6 +1109,27 @@ const hasBlockingIncomingInvoiceErrors = computed(() => blockingIncomingInvoiceE
    </div>
  </div>

+  <UModal v-model:open="costCentresOpen" title="Kostenstellen bearbeiten" :dismissible="!costCentresSaving" :close="!costCentresSaving" :ui="{ content: 'sm:max-w-2xl' }">
+    <template #body>
+      <p class="mb-4 text-sm text-muted">Die Kostenstellen der Positionen können jederzeit geändert werden, auch bei gebuchten oder zugewiesenen Belegen. Alle anderen Angaben bleiben unverändert.</p>
+      <div class="space-y-4">
+        <UFormField v-for="row in costCentreDraft" :key="row.index" :label="row.label">
+          <InputGroup>
+            <USelectMenu v-model="row.costcentre" :items="costcentres" value-key="id" label-key="name" :filter-fields="['name', 'number']" class="w-full" :disabled="costCentresSaving">
+              <template #default>{{ costCentreOptionLabel(row.costcentre) }}</template>
+              <template #item="{ item }">{{ [item.number, item.name].filter(Boolean).join(' - ') }}</template>
+            </USelectMenu>
+            <UButton icon="i-heroicons-x-mark" variant="outline" :aria-label="`Kostenstelle für ${row.label} entfernen`" :disabled="costCentresSaving || !row.costcentre" @click="row.costcentre = null" />
+          </InputGroup>
+        </UFormField>
+      </div>
+    </template>
+    <template #footer>
+      <UButton variant="outline" :disabled="costCentresSaving" @click="costCentresOpen = false">Abbrechen</UButton>
+      <UButton :loading="costCentresSaving" @click="saveCostCentres">Kostenstellen speichern</UButton>
+    </template>
+  </UModal>
+
 </template>

 <style scoped>
--- a/frontend/pages/incomingInvoices/index.vue
+++ b/frontend/pages/incomingInvoices/index.vue
@@ -64,35 +64,89 @@ const setupPage = async () => {
  items.value = await useEntities(type).select("*, vendor(id,name), statementallocations(id,amount)",sort.value.column,sort.value.direction === "asc")
 }

-// Funktion zum Vorbereiten der Belege
-const prepareInvoices = async () => {
-  isPreparing.value = true
-  try {
-    await $api('/api/functions/services/prepareincominginvoices', { method: 'POST' })
+// Die Belegvorbereitung läuft im Backend im Hintergrund; hier wird nur der Status abgefragt.
+const preparationEndpoint = '/api/functions/services/prepareincominginvoices'
+let preparationPollTimer = null

-    toast.add({
-      title: 'Erfolg',
-      description: 'Eingangsbelege wurden vorbereitet.',
-      icon: 'i-heroicons-check-circle',
-      color: 'green'
-    })
-
-    // Liste neu laden
-    await setupPage()
-  } catch (error) {
-    console.error(error)
+const showPreparationResult = (status) => {
+  const result = status?.result
+  if (result?.error && !result.created?.length) {
    toast.add({
      title: 'Fehler',
-      description: 'Beim Vorbereiten der Belege ist ein Fehler aufgetreten.',
+      description: result.error,
      icon: 'i-heroicons-exclamation-circle',
      color: 'red'
    })
-  } finally {
+    return
+  }
+
+  const created = result?.created?.length || 0
+  const skipped = result?.skipped?.length || 0
+  toast.add({
+    title: 'Belegvorbereitung abgeschlossen',
+    description: `${created} Eingangsbeleg(e) vorbereitet${skipped ? `, ${skipped} Datei(en) übersprungen` : ''}.`,
+    icon: 'i-heroicons-check-circle',
+    color: 'green'
+  })
+}
+
+const pollPreparation = (notify) => {
+  clearTimeout(preparationPollTimer)
+  preparationPollTimer = setTimeout(async () => {
+    try {
+      const status = await $api(preparationEndpoint)
+      if (status?.running) {
+        pollPreparation(notify)
+        return
+      }
+      isPreparing.value = false
+      if (notify) showPreparationResult(status)
+      await setupPage()
+    } catch (error) {
+      console.error(error)
+      pollPreparation(notify)
+    }
+  }, 3000)
+}
+
+const prepareInvoices = async () => {
+  isPreparing.value = true
+  try {
+    await $api(preparationEndpoint, { method: 'POST' })
+    toast.add({
+      title: 'Belegvorbereitung gestartet',
+      description: 'Die Belege werden im Hintergrund vorbereitet.',
+      icon: 'i-heroicons-sparkles'
+    })
+    pollPreparation(true)
+  } catch (error) {
+    console.error(error)
    isPreparing.value = false
+    toast.add({
+      title: 'Fehler',
+      description: 'Die Belegvorbereitung konnte nicht gestartet werden.',
+      icon: 'i-heroicons-exclamation-circle',
+      color: 'red'
+    })
  }
 }

+const resumePreparationStatus = async () => {
+  try {
+    const status = await $api(preparationEndpoint)
+    if (status?.running) {
+      isPreparing.value = true
+      pollPreparation(true)
+    }
+  } catch (error) {
+    console.error(error)
+  }
+}
+
+onBeforeUnmount(() => clearTimeout(preparationPollTimer))
+
 setupPage()
+resumePreparationStatus()

 const selectedColumns = ref(tempStore.columns[type] ? [...tempStore.columns[type]] : dataType.templateColumns.filter(i => !i.disabledInTable))
 if (!selectedColumns.value.find((column) => column.key === openAmountColumnKey)) {