Add basic structure of projects

src/main/java/nl/tudelft/tam/model/JobHolder.java

@@ -2,17 +2,24 @@ package nl.tudelft.tam.model;
 
 import jakarta.persistence.*;
 import lombok.AllArgsConstructor;
-import lombok.Builder;
 import lombok.Data;
 import lombok.NoArgsConstructor;
+import lombok.experimental.SuperBuilder;
+
+import java.util.HashSet;
+import java.util.Set;
 
 @Data
 @Entity
-@Builder
+@SuperBuilder
 @NoArgsConstructor
 @AllArgsConstructor
-
+@Inheritance(strategy = InheritanceType.JOINED)
 public class JobHolder {
     @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY) //TODO: Once suborganisation is implemented, change to move this annotation to SubOrganisation id
     private Long id;
+
+    @OneToMany(mappedBy = "holder")
+    private Set<JobOffer> jobOffers = new HashSet<>();
 }

src/main/java/nl/tudelft/tam/model/JobOffer.java

@@ -43,7 +43,11 @@ public class JobOffer {
 	private Long id;
 
 	@NotNull
-	private Long editionId;
+	private Long editionId; //TODO: Remove this field
+
+	@Nullable
+	@ManyToOne
+	private JobHolder holder;
 
 	@NotBlank
 	@Builder.Default

src/main/java/nl/tudelft/tam/model/Project.java

+package nl.tudelft.tam.model;
+
+import jakarta.persistence.*;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.experimental.SuperBuilder;
+
+import javax.validation.constraints.NotNull;
+
+//TODO: once suborganisation is implemented, change JobHolder to SubOrganisation
+@Data
+@Entity
+@SuperBuilder
+@NoArgsConstructor
+@AllArgsConstructor
+public class Project extends JobHolder {
+    @NotNull
+    private String name;
+
+    @NotNull
+    @ManyToOne
+    private TAMProgram organisation; //TODO: once Organisation is implemented, change TAMProgram to Organisation
+}

src/main/java/nl/tudelft/tam/model/ProjectJobOffers.java

+package nl.tudelft.tam.model;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.OneToOne;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.NoArgsConstructor;
+import lombok.experimental.SuperBuilder;
+
+@Entity
+@SuperBuilder
+@NoArgsConstructor
+//@AllArgsConstructor
+public class ProjectJobOffers extends JobHolder {
+}