Update src/main/java/com/mediamanager/model/TrackHasComposer.java

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

src/main/java/com/mediamanager/model/TrackHasArtist.java

@@ -3,7 +3,10 @@ package com.mediamanager.model;
 import jakarta.persistence.*;
 
 @Entity
-@Table(name = "trackhasartist")
+@Table(
+    name = "trackhasartist",
+    uniqueConstraints = @UniqueConstraint(columnNames = {"fk_track_id", "fk_artist_id"})
+)
 public class TrackHasArtist {
 
     @Id

src/main/java/com/mediamanager/model/TrackHasComposer.java

@@ -3,7 +3,10 @@ package com.mediamanager.model;
 import jakarta.persistence.*;
 
 @Entity
-@Table(name = "trackhascomposer")
+@Table(
+    name = "trackhascomposer",
+    uniqueConstraints = @UniqueConstraint(columnNames = {"fk_track_id", "fk_composer_id"})
+)
 public class TrackHasComposer {
 
     @Id

src/main/java/com/mediamanager/model/TrackHasGenre.java

@@ -3,7 +3,8 @@ package com.mediamanager.model;
 import jakarta.persistence.*;
 
 @Entity
-@Table(name = "trackhasgenre")
+@Table(name = "trackhasgenre", 
+    uniqueConstraints = @UniqueConstraint(columnNames = {"fk_track_id", "fk_genre_id"}))
 public class TrackHasGenre {
 
     @Id

src/main/java/com/mediamanager/service/delegate/handler/trackhasgenre/GetTrackHasGenreByIdHandler.java

@@ -32,6 +32,10 @@ public class GetTrackHasGenreByIdHandler implements ActionHandler {
                     TrackHasGenreMessages.GetTrackHasGenreByIdRequest.parseFrom(requestPayload);
             int id = getByIdRequest.getId();
 
+            if (id <= 0) {
+                throw new IllegalArgumentException("ID must be greater than 0");
+            }
+
             Optional<TrackHasGenre> trackHasGenreOpt = trackHasGenreService.getTrackHasGenreById(id);
 
             if (trackHasGenreOpt.isEmpty()){
@@ -45,7 +49,13 @@ public class GetTrackHasGenreByIdHandler implements ActionHandler {
                     .setTrackhasgenre(trackHasGenreProto)
                     .build();
             return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(200)
                     .setPayload(getByIdResponse.toByteString());
+        } catch (IllegalArgumentException e) {
+            logger.error("Validation error", e);
+            return TransportProtocol.Response.newBuilder()
+                    .setStatusCode(400)
+                    .setPayload(ByteString.copyFromUtf8("Validation error: " + e.getMessage()));
         } catch (Exception e) {
             logger.error("Error getting track has genre by ID", e);
             return TransportProtocol.Response.newBuilder()