Updated Document entity to work with sourceId instead of callId

src/main/java/net/gepafin/tendermanagement/entities/DocumentEntity.java

@@ -20,14 +20,13 @@ public class DocumentEntity extends BaseEntity{
     @Column(name="TYPE")
     private String type;
 
-    @ManyToOne
-    @JoinColumn(name = "CALL_ID")
-    private CallEntity call;
+    @Column(name="SOURCE")
+    private String source;
+
+    @Column(name="SOURCE_ID")
+    private Long sourceId;
 
-    @Column(name = "DESCRIPTION", columnDefinition = "TEXT")
-    private String description;
-    
     @Column(name ="IS_DELETED", nullable = false)
     private Boolean isDeleted = false;
-    
+
 }