diff --git a/src/lib/server/shopping/repository.ts b/src/lib/server/shopping/repository.ts
new file mode 100644
index 0000000..bc0efd7
--- /dev/null
+++ b/src/lib/server/shopping/repository.ts
@@ -0,0 +1,67 @@
+import type Database from 'better-sqlite3';
+
+export type ShoppingCartRecipe = {
+  recipe_id: number;
+  title: string;
+  image_path: string | null;
+  servings: number;
+  servings_default: number;
+};
+
+export type ShoppingListRow = {
+  name_key: string;
+  unit_key: string;
+  display_name: string;
+  display_unit: string | null;
+  total_quantity: number | null;
+  from_recipes: string;
+  checked: 0 | 1;
+};
+
+export type ShoppingListSnapshot = {
+  recipes: ShoppingCartRecipe[];
+  rows: ShoppingListRow[];
+  uncheckedCount: number;
+};
+
+export function addRecipeToCart(
+  _db: Database.Database,
+  _recipeId: number,
+  _profileId: number | null,
+  _servings?: number
+): void {
+  throw new Error('not implemented');
+}
+
+export function removeRecipeFromCart(_db: Database.Database, _recipeId: number): void {
+  throw new Error('not implemented');
+}
+
+export function setCartServings(
+  _db: Database.Database,
+  _recipeId: number,
+  _servings: number
+): void {
+  throw new Error('not implemented');
+}
+
+export function listShoppingList(_db: Database.Database): ShoppingListSnapshot {
+  throw new Error('not implemented');
+}
+
+export function toggleCheck(
+  _db: Database.Database,
+  _nameKey: string,
+  _unitKey: string,
+  _checked: boolean
+): void {
+  throw new Error('not implemented');
+}
+
+export function clearCheckedItems(_db: Database.Database): void {
+  throw new Error('not implemented');
+}
+
+export function clearCart(_db: Database.Database): void {
+  throw new Error('not implemented');
+}