Add some comments

app/src/database/migrations/1735633836694-replace-presence-type-with-remote-column.ts

@@ -2,6 +2,11 @@ import { MigrationInterface, QueryRunner, TableColumn } from "typeorm";
 
 export class ReplacePresenceTypeWithRemoteColumn1735633836694 implements MigrationInterface {
   public async up(queryRunner: QueryRunner): Promise<void> {
+    /*
+     * N.B.: Values are not migrated from `type` to `remote` because Kaiku is
+     * not running anywhere yet and the default value of `remote`, while
+     * sometimes incorrect, will not break anything.
+     */
     const table = await queryRunner.getTable("presence");
 
     await queryRunner.dropColumn(table, "type");

app/src/entities/presence/presence.model.ts

@@ -15,6 +15,13 @@ export class Presence {
   @PrimaryColumn({ type: "date" })
   date: string;
 
+  /**
+   * Indicates whether user is working remotely or at office.
+   *
+   * This field should be always considered when handling presences – if there
+   * are no offices added to Kaiku, the `office` field will always be empty
+   * rendering using it alone for logic unreliable.
+   */
   @Column({ name: "remote", type: "boolean", nullable: false, default: false })
   remote: boolean;