diff --git a/src/lib/server/pos-service.test.ts b/src/lib/server/pos-service.test.ts
index dc259c8..4a0136f 100644
--- a/src/lib/server/pos-service.test.ts
+++ b/src/lib/server/pos-service.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect, vi } from "vitest";
-import { checkoutSale, listActiveStockCatalog } from "./pos-service";
+import { checkoutSale, listActiveStockCatalog, listSalesInRange } from "./pos-service";
 
 function stubPb(items: unknown[]) {
   return {
@@ -279,3 +279,89 @@ describe("checkoutSale", () => {
     expect(updates).toEqual([]);
   });
 });
+
+describe("listSalesInRange", () => {
+  it("fetches sales in the range and their line items in one follow-up call", async () => {
+    const salesGetList = vi.fn().mockResolvedValue({
+      items: [
+        { id: "sale-1", total: 100 },
+        { id: "sale-2", total: 200 },
+      ],
+    });
+    const itemsGetList = vi.fn().mockResolvedValue({
+      items: [
+        { id: "si-1", sale: "sale-1", qty: 2 },
+        { id: "si-2", sale: "sale-2", qty: 1 },
+      ],
+    });
+    const pb = {
+      collection: (name: string) => {
+        if (name === "pos_sales") {
+          return {
+            getFullList: vi.fn(),
+            getOne: vi.fn(),
+            create: vi.fn(),
+            update: vi.fn(),
+            getList: salesGetList,
+          };
+        }
+        if (name === "pos_sale_items") {
+          return {
+            getFullList: vi.fn(),
+            getOne: vi.fn(),
+            create: vi.fn(),
+            update: vi.fn(),
+            getList: itemsGetList,
+          };
+        }
+        throw new Error(`unexpected collection ${name}`);
+      },
+    };
+
+    const result = await listSalesInRange(pb, {
+      from: "2026-08-30 00:00:00",
+      to: "2026-08-30 23:59:59",
+    });
+
+    expect(result.sales).toHaveLength(2);
+    expect(result.items).toHaveLength(2);
+    expect(salesGetList).toHaveBeenCalledWith(1, 500, {
+      filter: "created >= '2026-08-30 00:00:00' && created <= '2026-08-30 23:59:59'",
+      sort: "-created",
+    });
+    expect(itemsGetList).toHaveBeenCalledWith(1, 2000, {
+      filter: "sale = 'sale-1' || sale = 'sale-2'",
+    });
+  });
+
+  it("skips the items query when there are no sales in range", async () => {
+    const salesGetList = vi.fn().mockResolvedValue({ items: [] });
+    const itemsGetList = vi.fn();
+    const pb = {
+      collection: (name: string) =>
+        name === "pos_sales"
+          ? {
+              getFullList: vi.fn(),
+              getOne: vi.fn(),
+              create: vi.fn(),
+              update: vi.fn(),
+              getList: salesGetList,
+            }
+          : {
+              getFullList: vi.fn(),
+              getOne: vi.fn(),
+              create: vi.fn(),
+              update: vi.fn(),
+              getList: itemsGetList,
+            },
+    };
+
+    const result = await listSalesInRange(pb, {
+      from: "2026-08-30 00:00:00",
+      to: "2026-08-30 23:59:59",
+    });
+
+    expect(result).toEqual({ sales: [], items: [] });
+    expect(itemsGetList).not.toHaveBeenCalled();
+  });
+});
diff --git a/src/lib/server/pos-service.ts b/src/lib/server/pos-service.ts
index f701033..ef1ab90 100644
--- a/src/lib/server/pos-service.ts
+++ b/src/lib/server/pos-service.ts
@@ -264,3 +264,30 @@ export async function checkoutSale(
 
   return { ok: true, sale, items, stockErrors, duplicate: false };
 }
+
+// ─── listSalesInRange ───────────────────────────────────────────────
+
+export type PosSalesRangeResult = {
+  sales: PosSale[];
+  items: PosSaleItem[];
+};
+
+/**
+ * Sales + their line items for history.html / cashup.html. `from`/`to`
+ * are PB datetime filter strings (e.g. "2026-08-30 00:00:00").
+ */
+export async function listSalesInRange(
+  pb: PosPb,
+  range: { from: string; to: string },
+): Promise<PosSalesRangeResult> {
+  const salesPage = await pb.collection("pos_sales").getList<PosSale>(1, 500, {
+    filter: `created >= '${escapePbValue(range.from)}' && created <= '${escapePbValue(range.to)}'`,
+    sort: "-created",
+  });
+  const sales = salesPage.items;
+  if (sales.length === 0) return { sales: [], items: [] };
+
+  const filter = sales.map((s) => `sale = '${escapePbValue(s.id)}'`).join(" || ");
+  const itemsPage = await pb.collection("pos_sale_items").getList<PosSaleItem>(1, 2000, { filter });
+  return { sales, items: itemsPage.items };
+}