Add new YT links. Add one more SD solution

Author: andrei-punko

README.md

@@ -262,6 +262,7 @@ We can perceive materials in this folder as project backlog or "box with other s
 | Три типа аспектов на примере AspectJ                                                             | [YouTube](https://youtu.be/S-LrdkfDSCU) | [Repo](https://github.com/andrei-punko/aspectj-sandbox)                                                                                                                                                                                          |
 | GitHub Actions: workflows, coverage, badges                                                      | [YouTube](https://youtu.be/8O9ZmQfixF4) | [Repo1](https://github.com/andrei-punko/spring-boot-3-template) [Repo2](https://github.com/andrei-punko/aspectj-sandbox) [Repo3](https://github.com/andrei-punko/java-interview-coding) [Repo4](https://github.com/andrei-punko/spring-boot-jwt) |
 | Самодельный ArrayList 2                                                                          | [YouTube](https://youtu.be/VBdYvDW8WL8) | [Code](src/main/java/by/andd3dfx/collections/custom/CustomArrayList.java)                                                                                                                                                                        |
+| Ревью и рефакторинг кода подписчика (Spring Boot сервис)                                         | [YouTube](https://youtu.be/sQQ0pkR9YRM) | [Repo](https://github.com/EkaterinaBezheskaia/CaseLabTestTask)                                                                                                                                                                                   |
 
 | Title                           |           YouTube video link            |
 |---------------------------------|:---------------------------------------:|
@@ -285,6 +286,7 @@ We can perceive materials in this folder as project backlog or "box with other s
 | Прохождение теста "продвинутый" по ООП на hh.ru                | [YouTube](https://youtu.be/CYq6ThzXj1Q) |
 | Прохождение теста "средний" по Алгоритмам на hh.ru             | [YouTube](https://youtu.be/7rTVLwpg0U8) |
 | Прохождение теста "базовый" по Git на hh.ru                    | [YouTube](https://youtu.be/DiVsSMsuxP8) |
+| Прохождение теста "средний" по Linux на hh.ru                  | [YouTube](https://youtu.be/fcCLJxcMhdA) |
 
 </details>
 

interview-materials/system-design/04.shop-checks-restapi.txt

@@ -0,0 +1,53 @@
+
+* Design REST API to work with shop checks
+
+** Create check
+POST /api/v1/check
+request: {
+	"point_id": ...
+}
+201
+
+** Get check by id
+PUT /api/v1/check/{id}
+request: {
+	"items": [
+		{
+			"item_id": ...,
+			"product_id": ...,
+			"quantity": ...
+		},
+		{
+			"item_id": ...,
+			"product_id": ...,
+			"weight": ...
+		},
+		...
+	]
+}
+200
+
+** Delete check
+DELETE /api/v1/check/{id}/{item_id}
+204
+
+** Get discount
+GET /api/v1/check/{id}/discount
+response: {
+	"value": ...,
+	"reason": ...
+}
+200
+
+** Get checks with pagination
+GET /api/v1/check?day=...&page=2&size=50
+response: {
+	... (payload)
+	pageInfo: {
+		page: ...,
+		size: 50,
+		hasNext: true,
+		...
+	}
+}
+200