diff --git a/API.company.md b/API.company.md
index 7e8e468..2d3296c 100644
--- a/API.company.md
+++ b/API.company.md
@@ -9,8 +9,7 @@ This document is auto-generated from the JSDoc comments in `src/store` by runnin
 Creates a new company together with its root category, POS customer group, default language and tax rates, and links it to the given Google auth user.
 
 ```js
-const fn = create(pool);
-const company = await fn({
+const company = await store.company.create({
   iso639: 'de',
   name: 'Acme',
   taxrate: 19,
@@ -27,8 +26,7 @@ const company = await fn({
 Deletes a company by its id.
 
 ```js
-const fn = del(pool);
-await fn(1);
+await store.company.delete(1);
 ```
 
 ## `company.getById`
@@ -38,8 +36,7 @@ await fn(1);
 Returns a single company by its id.
 
 ```js
-const fn = getById(pool);
-const company = await fn(1);
+const company = await store.company.getById(1);
 // => { id, name, ... }
 ```
 
@@ -50,8 +47,7 @@ const company = await fn(1);
 Returns a single company by its name.
 
 ```js
-const fn = getByName(pool);
-const company = await fn('Acme');
+const company = await store.company.getByName('Acme');
 // => { id, name, ... }
 ```
 
@@ -62,8 +58,7 @@ const company = await fn('Acme');
 Lists the companies accessible to the given Google auth user.
 
 ```js
-const fn = list(pool);
-const companies = await fn(42);
+const companies = await store.company.list(42);
 // => [{ id, name, ... }]
 ```
 
@@ -74,7 +69,6 @@ const companies = await fn(42);
 Updates an existing company's name, language and tax rates.
 
 ```js
-const fn = update(pool);
-const result = await fn(1, { iso639: 'de', name: 'Acme', taxrate: 19, reducedtaxrate: 7 });
+const result = await store.company.update(1, { iso639: 'de', name: 'Acme', taxrate: 19, reducedtaxrate: 7 });
 // => { id, rootCategoryId, languageId, taxrateId, reducedtaxrateId, taxfreerateId }
 ```
diff --git a/API.companyuser.md b/API.companyuser.md
index 22f3606..b104706 100644
--- a/API.companyuser.md
+++ b/API.companyuser.md
@@ -9,8 +9,7 @@ This document is auto-generated from the JSDoc comments in `src/store` by runnin
 Adds a company user linking a company to a Google auth account.
 
 ```js
-const fn = add(pool);
-const id = await fn(1, 42);
+const id = await store.companyuser.add(1, 42);
 // => 7
 ```
 
@@ -21,8 +20,7 @@ const id = await fn(1, 42);
 Deletes a company user link by its id.
 
 ```js
-const fn = del(pool);
-await fn(7);
+await store.companyuser.delete(7);
 ```
 
 ## `companyuser.getByEmail`
@@ -32,7 +30,6 @@ await fn(7);
 Returns the company user ids associated with the given email address.
 
 ```js
-const fn = getByEmail(pool);
-const ids = await fn('user@example.com');
+const ids = await store.companyuser.getByEmail('user@example.com');
 // => [1, 2, 3]
 ```
diff --git a/API.lang.md b/API.lang.md
index 5d20b48..31250f8 100644
--- a/API.lang.md
+++ b/API.lang.md
@@ -9,8 +9,7 @@ This document is auto-generated from the JSDoc comments in `src/store` by runnin
 Creates a new language by its ISO 639 code.
 
 ```js
-const fn = create(pool);
-const id = await fn('de');
+const id = await store.lang.create('de');
 // => 1
 ```
 
@@ -21,8 +20,7 @@ const id = await fn('de');
 Deletes a language by its id.
 
 ```js
-const fn = del(pool);
-await fn(1);
+await store.lang.delete(1);
 ```
 
 ## `lang.ensure`
@@ -32,8 +30,7 @@ await fn(1);
 Returns the id of a language by ISO code, creating it if it does not exist.
 
 ```js
-const fn = ensure(pool);
-const id = await fn('de');
+const id = await store.lang.ensure('de');
 // => 1
 ```
 
@@ -44,9 +41,8 @@ const id = await fn('de');
 Returns a language row by its ISO 639 code.
 
 ```js
-const fn = getByIso639(pool);
-const lang = await fn('de');
-// => { id, iso639 }
+const lang = await store.lang.getByIso639('de');
+// => { id: 1, iso639: 'de' }
 ```
 
 ## `lang.list`
@@ -56,7 +52,6 @@ const lang = await fn('de');
 Lists all languages.
 
 ```js
-const fn = list(pool);
-const languages = await fn();
-// => [{ id, iso639 }]
+const languages = await store.lang.list();
+// => [{ id: 1, iso639: 'de' }]
 ```
diff --git a/API.tax.md b/API.tax.md
index d6f77c4..40462b7 100644
--- a/API.tax.md
+++ b/API.tax.md
@@ -9,8 +9,7 @@ This document is auto-generated from the JSDoc comments in `src/store` by runnin
 Creates a new tax rate.
 
 ```js
-const fn = create(pool);
-const id = await fn(19);
+const id = await store.tax.create(19);
 // => 1
 ```
 
@@ -21,8 +20,7 @@ const id = await fn(19);
 Returns the id of a tax rate, creating it if it does not exist.
 
 ```js
-const fn = ensure(pool);
-const id = await fn(19);
+const id = await store.tax.ensure(19);
 // => 1
 ```
 
@@ -33,9 +31,8 @@ const id = await fn(19);
 Returns a tax row by its rate.
 
 ```js
-const fn = getByRate(pool);
-const tax = await fn(19);
-// => { id, rate }
+const tax = await store.tax.getByRate(19);
+// => { id: 1, rate: 19 }
 ```
 
 ## `tax.list`
@@ -45,7 +42,6 @@ const tax = await fn(19);
 Lists all tax rates.
 
 ```js
-const fn = list(pool);
-const taxes = await fn();
-// => [{ id, rate }]
+const taxes = await store.tax.list();
+// => [{ id: 1, rate: 19 }]
 ```
diff --git a/src/store/company/create.js b/src/store/company/create.js
index b3e9e53..947ede0 100644
--- a/src/store/company/create.js
+++ b/src/store/company/create.js
@@ -11,29 +11,34 @@ import langEnsure from '../lang/ensure.js';
 import taxEnsure from '../tax/ensure.js';
 import request from '../request.js';
 
-/**
- * Creates a new company together with its root category, POS customer group,
- * default language and tax rates, and links it to the given Google auth user.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that creates a company.
- *
- * @example
- * const fn = create(pool);
- * const company = await fn({
- *   iso639: 'de',
- *   name: 'Acme',
- *   taxrate: 19,
- *   reducedtaxrate: 7,
- *   googleAuthId: 42,
- * });
- * // => { id, rootCategoryId, languageId, taxrateId, reducedtaxrateId, taxfreerateId, posCustomerGroupId }
- */
 export default function create(pool) {
   const nameTaken = getByName(pool);
   const ensureLang = langEnsure(pool);
   const ensureTax = taxEnsure(pool);
 
+  /**
+   * Creates a new company together with its root category, POS customer group,
+   * default language and tax rates, and links it to the given Google auth user.
+   *
+   * @param {object} input - The company creation input.
+   * @param {string} input.iso639 - The ISO 639 language code for the company.
+   * @param {string} input.name - The company name (must be unique).
+   * @param {number} input.taxrate - The standard tax rate in percent.
+   * @param {number} input.reducedtaxrate - The reduced tax rate in percent.
+   * @param {number} input.googleAuthId - The id of the Google auth user to link.
+   * @returns {Promise<{id: number, rootCategoryId: number, languageId: number, taxrateId: number, reducedtaxrateId: number, taxfreerateId: number, posCustomerGroupId: number}>} The created company ids.
+   * @throws {Error} If the company name is already taken.
+   *
+   * @example
+   * const company = await store.company.create({
+   *   iso639: 'de',
+   *   name: 'Acme',
+   *   taxrate: 19,
+   *   reducedtaxrate: 7,
+   *   googleAuthId: 42,
+   * });
+   * // => { id, rootCategoryId, languageId, taxrateId, reducedtaxrateId, taxfreerateId, posCustomerGroupId }
+   */
   return async ({ iso639, name, taxrate, reducedtaxrate, googleAuthId }) => {
     const tx = pool.transaction();
     await tx.begin();
diff --git a/src/store/company/delete.js b/src/store/company/delete.js
index 283f4ca..6477bd8 100644
--- a/src/store/company/delete.js
+++ b/src/store/company/delete.js
@@ -1,16 +1,15 @@
 import { DELETE } from '../../sql/company.js';
 
-/**
- * Deletes a company by its id.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that deletes a company.
- *
- * @example
- * const fn = del(pool);
- * await fn(1);
- */
 export default function del(pool) {
+  /**
+   * Deletes a company by its id.
+   *
+   * @param {number} companyId - The id of the company to delete.
+   * @returns {Promise<void>}
+   *
+   * @example
+   * await store.company.delete(1);
+   */
   return async (companyId) => {
     await pool
       .request()
diff --git a/src/store/company/getById.js b/src/store/company/getById.js
index 04b35fb..1468282 100644
--- a/src/store/company/getById.js
+++ b/src/store/company/getById.js
@@ -1,18 +1,18 @@
 import { GET_BY_ID } from '../../sql/company.js';
 import request from '../request.js';
 
-/**
- * Returns a single company by its id.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that fetches a company by id.
- *
- * @example
- * const fn = getById(pool);
- * const company = await fn(1);
- * // => { id, name, ... }
- */
 export default function getById(pool) {
+  /**
+   * Returns a single company by its id.
+   *
+   * @param {number} id - The id of the company.
+   * @param {object} [tx] - Optional transaction to run within.
+   * @returns {Promise<object|undefined>} The company row, or `undefined` if not found.
+   *
+   * @example
+   * const company = await store.company.getById(1);
+   * // => { id, name, ... }
+   */
   return async (id, tx) => {
     const result = await request(pool, tx)
       .input('id', id)
diff --git a/src/store/company/getByName.js b/src/store/company/getByName.js
index 3197c7f..1097132 100644
--- a/src/store/company/getByName.js
+++ b/src/store/company/getByName.js
@@ -1,18 +1,18 @@
 import { GET_BY_NAME } from '../../sql/company.js';
 import request from '../request.js';
 
-/**
- * Returns a single company by its name.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that fetches a company by name.
- *
- * @example
- * const fn = getByName(pool);
- * const company = await fn('Acme');
- * // => { id, name, ... }
- */
 export default function getByName(pool) {
+  /**
+   * Returns a single company by its name.
+   *
+   * @param {string} name - The company name.
+   * @param {object} [tx] - Optional transaction to run within.
+   * @returns {Promise<object|undefined>} The company row, or `undefined` if not found.
+   *
+   * @example
+   * const company = await store.company.getByName('Acme');
+   * // => { id, name, ... }
+   */
   return async (name, tx) => {
     const result = await request(pool, tx)
       .input('name', name)
diff --git a/src/store/company/list.js b/src/store/company/list.js
index 7ef868b..2a0a41c 100644
--- a/src/store/company/list.js
+++ b/src/store/company/list.js
@@ -1,17 +1,16 @@
 import { LIST } from '../../sql/company.js';
 
-/**
- * Lists the companies accessible to the given Google auth user.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that lists companies.
- *
- * @example
- * const fn = list(pool);
- * const companies = await fn(42);
- * // => [{ id, name, ... }]
- */
 export default function list(pool) {
+  /**
+   * Lists the companies accessible to the given Google auth user.
+   *
+   * @param {number} googleAuthId - The id of the Google auth user.
+   * @returns {Promise<Array<object>>} The accessible company rows.
+   *
+   * @example
+   * const companies = await store.company.list(42);
+   * // => [{ id, name, ... }]
+   */
   return async (googleAuthId) => {
     const result = await pool
       .request()
diff --git a/src/store/company/update.js b/src/store/company/update.js
index 5849590..f5b17f0 100644
--- a/src/store/company/update.js
+++ b/src/store/company/update.js
@@ -5,23 +5,28 @@ import langEnsure from '../lang/ensure.js';
 import taxEnsure from '../tax/ensure.js';
 import request from '../request.js';
 
-/**
- * Updates an existing company's name, language and tax rates.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that updates a company.
- *
- * @example
- * const fn = update(pool);
- * const result = await fn(1, { iso639: 'de', name: 'Acme', taxrate: 19, reducedtaxrate: 7 });
- * // => { id, rootCategoryId, languageId, taxrateId, reducedtaxrateId, taxfreerateId }
- */
 export default function update(pool) {
   const byId = getById(pool);
   const byName = getByName(pool);
   const ensureLang = langEnsure(pool);
   const ensureTax = taxEnsure(pool);
 
+  /**
+   * Updates an existing company's name, language and tax rates.
+   *
+   * @param {number} id - The id of the company to update.
+   * @param {object} input - The update input.
+   * @param {string} input.iso639 - The ISO 639 language code.
+   * @param {string} input.name - The new company name (must be unique).
+   * @param {number} input.taxrate - The standard tax rate in percent.
+   * @param {number} input.reducedtaxrate - The reduced tax rate in percent.
+   * @returns {Promise<{id: number, rootCategoryId: number, languageId: number, taxrateId: number, reducedtaxrateId: number, taxfreerateId: number}>} The updated company ids.
+   * @throws {Error} If the company is not found or the name is taken.
+   *
+   * @example
+   * const result = await store.company.update(1, { iso639: 'de', name: 'Acme', taxrate: 19, reducedtaxrate: 7 });
+   * // => { id, rootCategoryId, languageId, taxrateId, reducedtaxrateId, taxfreerateId }
+   */
   return async (id, { iso639, name, taxrate, reducedtaxrate }) => {
     const tx = pool.transaction();
     await tx.begin();
diff --git a/src/store/companyuser/add.js b/src/store/companyuser/add.js
index 085fb53..29cedd2 100644
--- a/src/store/companyuser/add.js
+++ b/src/store/companyuser/add.js
@@ -1,17 +1,17 @@
 import { ADD } from '../../sql/companyuser.js';
 
-/**
- * Adds a company user linking a company to a Google auth account.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that creates the company user link.
- *
- * @example
- * const fn = add(pool);
- * const id = await fn(1, 42);
- * // => 7
- */
 export default function add(pool) {
+  /**
+   * Adds a company user linking a company to a Google auth account.
+   *
+   * @param {number} companyId - The id of the company.
+   * @param {number} googleAuthId - The id of the Google auth account.
+   * @returns {Promise<number>} The id of the created company user link.
+   *
+   * @example
+   * const id = await store.companyuser.add(1, 42);
+   * // => 7
+   */
   return async (companyId, googleAuthId) => {
     const result = await pool
       .request()
diff --git a/src/store/companyuser/delete.js b/src/store/companyuser/delete.js
index 0d5f28f..f0b5ffe 100644
--- a/src/store/companyuser/delete.js
+++ b/src/store/companyuser/delete.js
@@ -1,16 +1,15 @@
 import { DELETE } from '../../sql/companyuser.js';
 
-/**
- * Deletes a company user link by its id.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that removes the company user link.
- *
- * @example
- * const fn = del(pool);
- * await fn(7);
- */
 export default function del(pool) {
+  /**
+   * Deletes a company user link by its id.
+   *
+   * @param {number} id - The id of the company user link to delete.
+   * @returns {Promise<void>}
+   *
+   * @example
+   * await store.companyuser.delete(7);
+   */
   return async (id) => {
     await pool
       .request()
diff --git a/src/store/companyuser/getByEmail.js b/src/store/companyuser/getByEmail.js
index cfcb311..ed4fd19 100644
--- a/src/store/companyuser/getByEmail.js
+++ b/src/store/companyuser/getByEmail.js
@@ -1,17 +1,16 @@
 import { GET_BY_EMAIL } from '../../sql/companyuser.js';
 
-/**
- * Returns the company user ids associated with the given email address.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that resolves the company user ids for an email.
- *
- * @example
- * const fn = getByEmail(pool);
- * const ids = await fn('user@example.com');
- * // => [1, 2, 3]
- */
 export default function getByEmail(pool) {
+  /**
+   * Returns the company user ids associated with the given email address.
+   *
+   * @param {string} email - The email address.
+   * @returns {Promise<Array<number>>} The company user ids.
+   *
+   * @example
+   * const ids = await store.companyuser.getByEmail('user@example.com');
+   * // => [1, 2, 3]
+   */
   return async (email) => {
     const result = await pool
       .request()
diff --git a/src/store/lang/create.js b/src/store/lang/create.js
index 9e5682b..75be363 100644
--- a/src/store/lang/create.js
+++ b/src/store/lang/create.js
@@ -1,18 +1,18 @@
 import { CREATE } from '../../sql/language.js';
 import request from '../request.js';
 
-/**
- * Creates a new language by its ISO 639 code.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that creates a language.
- *
- * @example
- * const fn = create(pool);
- * const id = await fn('de');
- * // => 1
- */
 export default function create(pool) {
+  /**
+   * Creates a new language by its ISO 639 code.
+   *
+   * @param {string} iso639 - The ISO 639 language code (e.g. `'de'`).
+   * @param {object} [tx] - Optional transaction to run within.
+   * @returns {Promise<number>} The id of the created language.
+   *
+   * @example
+   * const id = await store.lang.create('de');
+   * // => 1
+   */
   return async (iso639, tx) => {
     const result = await request(pool, tx)
       .input('iso639', iso639)
diff --git a/src/store/lang/delete.js b/src/store/lang/delete.js
index 14fe0e9..897b851 100644
--- a/src/store/lang/delete.js
+++ b/src/store/lang/delete.js
@@ -1,16 +1,15 @@
 import { DELETE } from '../../sql/language.js';
 
-/**
- * Deletes a language by its id.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that deletes a language.
- *
- * @example
- * const fn = del(pool);
- * await fn(1);
- */
 export default function del(pool) {
+  /**
+   * Deletes a language by its id.
+   *
+   * @param {number} id - The id of the language to delete.
+   * @returns {Promise<void>}
+   *
+   * @example
+   * await store.lang.delete(1);
+   */
   return async (id) => {
     await pool
       .request()
diff --git a/src/store/lang/ensure.js b/src/store/lang/ensure.js
index 36db379..fbb4c32 100644
--- a/src/store/lang/ensure.js
+++ b/src/store/lang/ensure.js
@@ -1,20 +1,20 @@
 import getByIso639 from './getByIso639.js';
 import create from './create.js';
 
-/**
- * Returns the id of a language by ISO code, creating it if it does not exist.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that ensures a language exists.
- *
- * @example
- * const fn = ensure(pool);
- * const id = await fn('de');
- * // => 1
- */
 export default function ensure(pool) {
   const get = getByIso639(pool);
   const add = create(pool);
+  /**
+   * Returns the id of a language by ISO code, creating it if it does not exist.
+   *
+   * @param {string} iso639 - The ISO 639 language code (e.g. `'de'`).
+   * @param {object} [tx] - Optional transaction to run within.
+   * @returns {Promise<number>} The id of the language.
+   *
+   * @example
+   * const id = await store.lang.ensure('de');
+   * // => 1
+   */
   return async (iso639, tx) => {
     const row = await get(iso639, tx);
     if (row) return row.id;
diff --git a/src/store/lang/getByIso639.js b/src/store/lang/getByIso639.js
index 4a72a72..93ccdb5 100644
--- a/src/store/lang/getByIso639.js
+++ b/src/store/lang/getByIso639.js
@@ -1,18 +1,18 @@
 import { GET_BY_ISO639 } from '../../sql/language.js';
 import request from '../request.js';
 
-/**
- * Returns a language row by its ISO 639 code.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that fetches a language by ISO code.
- *
- * @example
- * const fn = getByIso639(pool);
- * const lang = await fn('de');
- * // => { id, iso639 }
- */
 export default function getByIso639(pool) {
+  /**
+   * Returns a language row by its ISO 639 code.
+   *
+   * @param {string} iso639 - The ISO 639 language code (e.g. `'de'`).
+   * @param {object} [tx] - Optional transaction to run within.
+   * @returns {Promise<{id: number, iso639: string}>} The language row, or `undefined` if not found.
+   *
+   * @example
+   * const lang = await store.lang.getByIso639('de');
+   * // => { id: 1, iso639: 'de' }
+   */
   return async (iso639, tx) => {
     const result = await request(pool, tx)
       .input('iso639', iso639)
diff --git a/src/store/lang/list.js b/src/store/lang/list.js
index ae4ecdd..792dc95 100644
--- a/src/store/lang/list.js
+++ b/src/store/lang/list.js
@@ -1,17 +1,15 @@
 import { LIST } from '../../sql/language.js';
 
-/**
- * Lists all languages.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that lists languages.
- *
- * @example
- * const fn = list(pool);
- * const languages = await fn();
- * // => [{ id, iso639 }]
- */
 export default function list(pool) {
+  /**
+   * Lists all languages.
+   *
+   * @returns {Promise<Array<{id: number, iso639: string}>>} All language rows.
+   *
+   * @example
+   * const languages = await store.lang.list();
+   * // => [{ id: 1, iso639: 'de' }]
+   */
   return async () => {
     const result = await pool.request().query(LIST);
     return result.recordset;
diff --git a/src/store/tax/create.js b/src/store/tax/create.js
index 34320c7..1b5bbf5 100644
--- a/src/store/tax/create.js
+++ b/src/store/tax/create.js
@@ -1,18 +1,18 @@
 import { CREATE } from '../../sql/tax.js';
 import request from '../request.js';
 
-/**
- * Creates a new tax rate.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that creates a tax rate.
- *
- * @example
- * const fn = create(pool);
- * const id = await fn(19);
- * // => 1
- */
 export default function create(pool) {
+  /**
+   * Creates a new tax rate.
+   *
+   * @param {number} rate - The tax rate in percent (e.g. `19`).
+   * @param {object} [tx] - Optional transaction to run within.
+   * @returns {Promise<number>} The id of the created tax rate.
+   *
+   * @example
+   * const id = await store.tax.create(19);
+   * // => 1
+   */
   return async (rate, tx) => {
     const result = await request(pool, tx)
       .input('rate', rate)
diff --git a/src/store/tax/ensure.js b/src/store/tax/ensure.js
index 37f5494..0f8cd58 100644
--- a/src/store/tax/ensure.js
+++ b/src/store/tax/ensure.js
@@ -1,20 +1,20 @@
 import getByRate from './getByRate.js';
 import create from './create.js';
 
-/**
- * Returns the id of a tax rate, creating it if it does not exist.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that ensures a tax rate exists.
- *
- * @example
- * const fn = ensure(pool);
- * const id = await fn(19);
- * // => 1
- */
 export default function ensure(pool) {
   const get = getByRate(pool);
   const add = create(pool);
+  /**
+   * Returns the id of a tax rate, creating it if it does not exist.
+   *
+   * @param {number} rate - The tax rate in percent (e.g. `19`).
+   * @param {object} [tx] - Optional transaction to run within.
+   * @returns {Promise<number>} The id of the tax rate.
+   *
+   * @example
+   * const id = await store.tax.ensure(19);
+   * // => 1
+   */
   return async (rate, tx) => {
     const row = await get(rate, tx);
     if (row) return row.id;
diff --git a/src/store/tax/getByRate.js b/src/store/tax/getByRate.js
index f1f5f2a..c76aae7 100644
--- a/src/store/tax/getByRate.js
+++ b/src/store/tax/getByRate.js
@@ -1,18 +1,18 @@
 import { GET_BY_RATE } from '../../sql/tax.js';
 import request from '../request.js';
 
-/**
- * Returns a tax row by its rate.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that fetches a tax rate.
- *
- * @example
- * const fn = getByRate(pool);
- * const tax = await fn(19);
- * // => { id, rate }
- */
 export default function getByRate(pool) {
+  /**
+   * Returns a tax row by its rate.
+   *
+   * @param {number} rate - The tax rate in percent (e.g. `19`).
+   * @param {object} [tx] - Optional transaction to run within.
+   * @returns {Promise<{id: number, rate: number}>} The tax row, or `undefined` if not found.
+   *
+   * @example
+   * const tax = await store.tax.getByRate(19);
+   * // => { id: 1, rate: 19 }
+   */
   return async (rate, tx) => {
     const result = await request(pool, tx)
       .input('rate', rate)
diff --git a/src/store/tax/list.js b/src/store/tax/list.js
index 23187f2..28ec6a1 100644
--- a/src/store/tax/list.js
+++ b/src/store/tax/list.js
@@ -1,17 +1,15 @@
 import { LIST } from '../../sql/tax.js';
 
-/**
- * Lists all tax rates.
- *
- * @param {object} pool - The mssql connection pool.
- * @returns {Function} An async function that lists tax rates.
- *
- * @example
- * const fn = list(pool);
- * const taxes = await fn();
- * // => [{ id, rate }]
- */
 export default function list(pool) {
+  /**
+   * Lists all tax rates.
+   *
+   * @returns {Promise<Array<{id: number, rate: number}>>} All tax rate rows.
+   *
+   * @example
+   * const taxes = await store.tax.list();
+   * // => [{ id: 1, rate: 19 }]
+   */
   return async () => {
     const result = await pool.request().query(LIST);
     return result.recordset;