feat: soft delete database entities

packages/backend/src/models/query-builder.ts

@@ -0,0 +1,43 @@
+import { Model, Page, PartialModelObject, ForClassMethod, AnyQueryBuilder } from "objection";
+
+const DELETED_COLUMN_NAME = 'deleted_at';
+
+const buildQueryBuidlerForClass = (): ForClassMethod => {
+  return (modelClass) => {
+    const qb: AnyQueryBuilder = Model.QueryBuilder.forClass.call(ExtendedQueryBuilder, modelClass);
+    qb.onBuild((builder) => {
+      if (!builder.context().withSoftDeleted) {
+        builder.whereNull(`${qb.modelClass().tableName}.${DELETED_COLUMN_NAME}`);
+      }
+    });
+    return qb;
+  };
+};
+
+class ExtendedQueryBuilder<M extends Model, R = M[]> extends Model.QueryBuilder<M, R> {
+  ArrayQueryBuilderType!: ExtendedQueryBuilder<M, M[]>;
+  SingleQueryBuilderType!: ExtendedQueryBuilder<M, M>;
+  MaybeSingleQueryBuilderType!: ExtendedQueryBuilder<M, M | undefined>;
+  NumberQueryBuilderType!: ExtendedQueryBuilder<M, number>;
+  PageQueryBuilderType!: ExtendedQueryBuilder<M, Page<M>>;
+
+  static forClass: ForClassMethod = buildQueryBuidlerForClass();
+
+  delete() {
+    return this.patch({
+      [DELETED_COLUMN_NAME]: (new Date()).toISOString(),
+    } as unknown as PartialModelObject<M>);
+  }
+
+  hardDelete() {
+    return super.delete();
+  }
+
+  restore() {
+    return this.patch({
+      [DELETED_COLUMN_NAME]: null,
+    } as unknown as PartialModelObject<M>);
+  }
+}
+
+export default ExtendedQueryBuilder;