Feature/dto

src/main/java/org/example/alfs/dto/comment/CommentCreateDTO.java

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+package org.example.alfs.dto.comment;
+
+import jakarta.validation.constraints.NotBlank;
+import lombok.Data;
+
+/*
+ * DTO used to create a comment on a ticket.
+ * Can be used by reporter, investigator and admin.
+ */
+@Data
+public class CommentCreateDTO {
+
+    @NotBlank
+    private String message;
+}

src/main/java/org/example/alfs/dto/comment/CommentViewDTO.java

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+package org.example.alfs.dto.comment;
+
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+/*
+ * DTO returned when retrieving comments for a ticket.
+ *
+ * Contains comment message, creation timestamp and information
+ * about who created the comment. The author can be either an
+ * anonymous reporter or a logged-in user such as an investigator
+ * or admin.
+ *
+ * Used when displaying ticket conversation history.
+ */
+@Data
+public class CommentViewDTO {
+
+    private Long id;
+    private String message;
+    private String author;
+    private String role;
+    private LocalDateTime createdAt;
+}

src/main/java/org/example/alfs/dto/ticket/TicketAssignDTO.java

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+package org.example.alfs.dto.ticket;
+
+import jakarta.validation.constraints.NotNull;
+import lombok.Data;
+
+/*
+Admin assigns ticket to investigator
+ */
+@Data
+public class TicketAssignDTO {
+
+    @NotNull
+    private Long investigatorId;
+}

src/main/java/org/example/alfs/dto/ticket/TicketCreateDTO.java

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+package org.example.alfs.dto.ticket;
+
+import jakarta.validation.constraints.NotBlank;
+import lombok.Data;
+
+/*
+ * Reporter creates ticket
+ * The reporter provides the initial information describing the incident.
+ *
+ * The reporter cannot modify the ticket after creation. Any additional
+ * information must be provided through comments.
+ */
+
+@Data
+public class TicketCreateDTO {
+
+
+    @NotBlank
+    private String title;
+
+    @NotBlank
+    private String description;
+}

src/main/java/org/example/alfs/dto/ticket/TicketStatusUpdateDTO.java

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+package org.example.alfs.dto.ticket;
+
+import jakarta.validation.constraints.NotNull;
+import lombok.Data;
+import org.example.alfs.enums.TicketStatus;
+
+/*
+*Investigator changes tickets status
+*The status represents the lifecycle of the ticket
+* (e.g. OPEN, IN_PROGRESS, RESOLVED, CLOSED).
+*/
+@Data
+public class TicketStatusUpdateDTO {
+
+    @NotNull
+    private TicketStatus status;
+
+
+}

src/main/java/org/example/alfs/dto/ticket/TicketViewDTO.java

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+package org.example.alfs.dto.ticket;
+
+import lombok.Data;
+import org.example.alfs.enums.TicketStatus;
+
+import java.time.LocalDateTime;
+
+/*
+ * DTO returned when retrieving ticket information.
+ *
+ * Contains the main ticket data such as title, description, status,
+ * creation timestamp and assigned handler.
+ *
+ * Used by admin and investigators when viewing tickets.
+ */
+@Data
+public class TicketViewDTO {
+
+    private Long id;
+    private String title;
+    private String description;
+    private TicketStatus status;
+    private LocalDateTime createdAt;
+
+    private Long assignedInvestigatorId;
+}