few improvements

src/main/java/_11/asktpk/artisanconnectbackend/Controller/ArtisanConnectController.java

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+package _11.asktpk.artisanconnectbackend.Controller;
+
+import _11.asktpk.artisanconnectbackend.Model.Notice;
+import _11.asktpk.artisanconnectbackend.Repository.NoticeRepository;
+import _11.asktpk.artisanconnectbackend.Service.PostgresDatabase;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RequestMapping("/api/v1")
+@RestController
+public class ArtisanConnectController {
+    @Autowired
+    private PostgresDatabase postgresDatabase;
+
+    @GetMapping("/notices/all")
+    public List<Notice> getAllNotices() {
+        return postgresDatabase.get();
+    }
+
+    @ResponseStatus(HttpStatus.CREATED)
+    @PostMapping("/notices/add")
+    public void addNotice(@RequestBody Notice notice) {
+        postgresDatabase.add(notice);
+    }
+}

src/main/java/_11/asktpk/artisanconnectbackend/Model/Notice.java

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+package _11.asktpk.artisanconnectbackend.Model;
+
+import jakarta.persistence.*;
+import java.sql.Blob;
+
+@Entity
+public class Notice {
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column
+    private String title;
+
+    @Column
+    private String username;
+
+    @Column
+    private String description;
+
+    public Notice() {
+        this.title = "";
+        this.username = "";
+        this.description = "";
+    }
+
+    public Notice(String nTitle, String nUsername, String nDescription) {
+        this.title = nTitle;
+        this.username = nUsername;
+        this.description = nDescription;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String user) {
+        this.username = user;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+}

src/main/java/_11/asktpk/artisanconnectbackend/Repository/NoticeRepository.java

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+package _11.asktpk.artisanconnectbackend.Repository;
+
+import _11.asktpk.artisanconnectbackend.Model.Notice;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface NoticeRepository extends JpaRepository<Notice, Long> {
+}

src/main/java/_11/asktpk/artisanconnectbackend/Service/IDatabase.java

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+package _11.asktpk.artisanconnectbackend.Service;
+
+import _11.asktpk.artisanconnectbackend.Model.Notice;
+
+import java.util.List;
+
+public interface IDatabase {
+    void add(Notice newNotice);
+    List<Notice> get();
+}

src/main/java/_11/asktpk/artisanconnectbackend/Service/PostgresDatabase.java

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+package _11.asktpk.artisanconnectbackend.Service;
+
+import _11.asktpk.artisanconnectbackend.Model.Notice;
+import _11.asktpk.artisanconnectbackend.Repository.NoticeRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class PostgresDatabase implements IDatabase{
+    @Autowired
+    private NoticeRepository noticeRepository;
+
+    @Override
+    public void add(Notice newNotice) {
+        noticeRepository.save(newNotice);
+    }
+
+    @Override
+    public List<Notice> get() {
+        return noticeRepository.findAll();
+    }
+}