Vertragstypen für Änderungsanfragen pflegen

backend/db/migrations/0036_allowed_contracttypes.sql

@@ -0,0 +1 @@
+ALTER TABLE "contracts" ADD COLUMN "allowedContracttypes" jsonb DEFAULT '[]'::jsonb NOT NULL;

backend/db/migrations/meta/_journal.json

@@ -246,6 +246,13 @@
       "when": 1778191200000,
       "tag": "0035_contract_history",
       "breakpoints": true
+    },
+    {
+      "idx": 35,
+      "version": "7",
+      "when": 1778194800000,
+      "tag": "0036_allowed_contracttypes",
+      "breakpoints": true
     }
   ]
 }

backend/db/schema/contracts.ts

@@ -52,6 +52,7 @@ export const contracts = pgTable(
         contracttype: bigint("contracttype", { mode: "number" }).references(
             () => contracttypes.id
         ),
+        allowedContracttypes: jsonb("allowedContracttypes").notNull().default([]),
 
         bankingIban: text("bankingIban"),
         bankingBIC: text("bankingBIC"),

backend/src/routes/portal/contracts.ts

@@ -32,6 +32,7 @@ async function getPortalContract(server: FastifyInstance, req: any, contractId:
             tenant: contracts.tenant,
             customer: contracts.customer,
             contracttype: contracts.contracttype,
+            allowedContracttypes: contracts.allowedContracttypes,
             archived: contracts.archived,
         })
         .from(contracts)
@@ -121,6 +122,14 @@ export default async function portalContractRoutes(server: FastifyInstance) {
             return reply.code(400).send({ error: "Ungültiger Vertragstyp" })
         }
 
+        const allowedContracttypes = Array.isArray(contract.allowedContracttypes)
+            ? contract.allowedContracttypes.map((id) => Number(id)).filter((id) => Number.isInteger(id))
+            : []
+
+        if (!allowedContracttypes.includes(requestedContracttype.id)) {
+            return reply.code(400).send({ error: "Dieser Vertragstyp steht für diesen Vertrag nicht zur Auswahl" })
+        }
+
         const [currentContracttype] = contract.contracttype
             ? await server.db
                 .select({