fix memberrlation

backend/db/schema/customers.ts

@@ -10,6 +10,7 @@ import {
 } from "drizzle-orm/pg-core"
 import { tenants } from "./tenants"
 import { authUsers } from "./auth_users"
+import { memberrelations } from "./memberrelations"
 
 export const customers = pgTable(
     "customers",
@@ -63,6 +64,7 @@ export const customers = pgTable(
 
         customPaymentType: text("custom_payment_type"), // ENUM payment_types separat?
         customTaxType: text("customTaxType"),
+        memberrelation: bigint("memberrelation", { mode: "number" }).references(() => memberrelations.id),
     }
 )