feat: clean up the imported temp files

packages/server/src/system/models/Import.ts

@@ -0,0 +1,86 @@
+import { Model, ModelObject } from 'objection';
+import SystemModel from './SystemModel';
+
+export class Import extends SystemModel {
+  resource: string;
+  tenantId: number;
+  mapping!: string;
+  columns!: string;
+  params!: string;
+
+  /**
+   * Table name.
+   */
+  static get tableName() {
+    return 'imports';
+  }
+
+  /**
+   * Virtual attributes.
+   */
+  static get virtualAttributes() {
+    return ['mappingParsed'];
+  }
+
+  /**
+   * Timestamps columns.
+   */
+  get timestamps() {
+    return ['createdAt', 'updatedAt'];
+  }
+
+  /**
+   * Detarmines whether the import is mapped.
+   * @returns {boolean}
+   */
+  public get isMapped() {
+    return Boolean(this.mapping);
+  }
+
+  public get columnsParsed() {
+    try {
+      return JSON.parse(this.columns);
+    } catch {
+      return [];
+    }
+  }
+
+  public get paramsParsed() {
+    try {
+      return JSON.parse(this.params);
+    } catch {
+      return [];
+    }
+  }
+
+  public get mappingParsed() {
+    try {
+      return JSON.parse(this.mapping);
+    } catch {
+      return [];
+    }
+  }
+
+  /**
+   * Relationship mapping.
+   */
+  static get relationMappings() {
+    const Tenant = require('system/models/Tenant');
+
+    return {
+      /**
+       * System user may belongs to tenant model.
+       */
+      tenant: {
+        relation: Model.BelongsToOneRelation,
+        modelClass: Tenant.default,
+        join: {
+          from: 'imports.tenantId',
+          to: 'tenants.id',
+        },
+      },
+    };
+  }
+}
+
+export type ImportShape = ModelObject<Import>;