feat: added spend limits to customer billing controls

shared/models/cusModels/billingControls/customerBillingControls.ts

@@ -1,7 +1,7 @@
 import { z } from "zod/v4";
 import {
 	type EntityBillingControls,
-	type EntityBillingControlsInput,
+	type EntityBillingControlsParams,
 	EntityBillingControlsSchema,
 } from "./entityBillingControls.js";
 import { PurchaseLimitIntervalEnum } from "./purchaseLimitInterval.js";
@@ -47,6 +47,32 @@ export const CustomerBillingControlsSchema = z.object({
 	}),
 });
 
+export const CustomerBillingControlsParamsSchema =
+	CustomerBillingControlsSchema.check((ctx) => {
+		const billingControls = ctx.value;
+		const featureIds = new Set<string>();
+
+		for (const [index, spendLimit] of (
+			billingControls.spend_limits ?? []
+		).entries()) {
+			if (!spendLimit.feature_id) {
+				continue;
+			}
+
+			if (featureIds.has(spendLimit.feature_id)) {
+				ctx.issues.push({
+					code: "custom",
+					message: "Only one spend limit entry is allowed per feature_id",
+					input: spendLimit.feature_id,
+					path: ["spend_limits", index, "feature_id"],
+				});
+				return;
+			}
+
+			featureIds.add(spendLimit.feature_id);
+		}
+	});
+
 export type AutoTopupPurchaseLimit = z.infer<
 	typeof AutoTopupPurchaseLimitSchema
 >;
@@ -55,9 +81,13 @@ export type CustomerBillingControls = z.infer<
 	typeof CustomerBillingControlsSchema
 >;
 
-export type CustomerBillingControlsInput = z.input<
-	typeof CustomerBillingControlsSchema
+export type CustomerBillingControlsParams = z.input<
+	typeof CustomerBillingControlsParamsSchema
 >;
 
 export { EntityBillingControlsSchema, DbSpendLimitSchema };
-export type { EntityBillingControls, EntityBillingControlsInput, DbSpendLimit };
+export type {
+	EntityBillingControls,
+	EntityBillingControlsParams,
+	DbSpendLimit,
+};