Prevent duplicate invoice number reservations

backend/src/utils/functions.ts

@@ -5,7 +5,7 @@ import bwipjs from "bwip-js"
 import Sharp from "sharp"
 
 import { tenants } from "../../db/schema"
-import { eq } from "drizzle-orm"
+import { eq, sql } from "drizzle-orm"
 
 export const useNextNumberRangeNumber = async (
     server: FastifyInstance,
@@ -19,7 +19,12 @@ export const useNextNumberRangeNumber = async (
         cancellationInvoices: "invoices",
     }
 
-    const [tenant] = await server.db
+    return server.db.transaction(async (tx) => {
+        // Serialisiert Nummernvergaben dieses Mandanten auch ueber mehrere
+        // Backend-Prozesse hinweg, bis die Transaktion abgeschlossen ist.
+        await tx.execute(sql`select pg_advisory_xact_lock(${tenantId})`)
+
+        const [tenant] = await tx
             .select()
             .from(tenants)
             .where(eq(tenants.id, tenantId))
@@ -54,12 +59,13 @@ export const useNextNumberRangeNumber = async (
             },
         }
 
-    await server.db
+        await tx
             .update(tenants)
             .set({ numberRanges: updatedRanges })
             .where(eq(tenants.id, tenantId))
 
         return { usedNumber }
+    })
 }
 
 export async function encodeBase64ToNiimbot(base64Png: string, printDirection: "top" | "left" = "top") {

frontend/pages/createDocument/edit/[[id]].vue

@@ -1761,7 +1761,7 @@ const saveDocument = async (state, resetup = false) => {
   itemInfo.value.state = state
   normalizeCustomSurchargePercentage()
 
-  if (state !== "Entwurf") {
+  if (state !== "Entwurf" && !itemInfo.value.documentNumber) {
     console.log("???")
 
     const type = itemInfo.value.type