- add references, collections and identifiers to dataset model

- npm updates

app/Models/DatasetIdentifier.ts

@@ -0,0 +1,40 @@
+import { column, BaseModel, SnakeCaseNamingStrategy, belongsTo, BelongsTo } from '@ioc:Adonis/Lucid/Orm';
+import { DateTime } from 'luxon';
+import Dataset from './Dataset';
+
+export default class DatasetIdentifier extends BaseModel {
+    public static namingStrategy = new SnakeCaseNamingStrategy();
+    public static primaryKey = 'id';
+    public static table = 'dataset_identifiers';
+    public static fillable: string[] = ['value', 'label', 'type', 'relation'];
+
+    @column({
+        isPrimary: true,
+    })
+    public id: number;
+
+    @column({})
+    public document_id: number; 
+
+    @column({})
+    public type: string;
+
+    @column({})
+    public value: string;
+
+    @column.dateTime({
+        autoCreate: true,
+    })
+    public created_at?: DateTime;
+
+    @column.dateTime({
+        autoCreate: true,
+        autoUpdate: true,
+    })
+    public updated_at?: DateTime;
+
+    @belongsTo(() => Dataset, {
+        foreignKey: 'document_id',
+    })
+    public dataset: BelongsTo<typeof Dataset>;
+}