Few improvements such as

application.properties.prod file
new DTO for response when adding notice

src/main/java/_11/asktpk/artisanconnectbackend/dto/NoticeAdditionDTO.java

@@ -0,0 +1,19 @@
+package _11.asktpk.artisanconnectbackend.dto;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter @Setter
+public class NoticeAdditionDTO {
+    public Long noticeId;
+    public String message;
+
+    public NoticeAdditionDTO(String message) {
+        this.message = message;
+    }
+
+    public NoticeAdditionDTO(Long noticeId, String message) {
+        this.noticeId = noticeId;
+        this.message = message;
+    }
+}