Reply to originally invoking message for reminders

We only do this if we have a reminder body, otherwise we would link to the original message twice.

backend/src/data/GuildReminders.ts

@@ -38,7 +38,7 @@ export class GuildReminders extends BaseGuildRepository {
     });
   }
 
-  async add(userId: string, channelId: string, remindAt: string, body: string, created_at: string) {
+  async add(userId: string, channelId: string, remindAt: string, body: string, created_at: string, source_id?: string) {
     const result = await this.reminders.insert({
       guild_id: this.guildId,
       user_id: userId,
@@ -46,6 +46,7 @@ export class GuildReminders extends BaseGuildRepository {
       remind_at: remindAt,
       body,
       created_at,
+      source_message_id: source_id,
     });
 
     return (await this.find(result.identifiers[0].id))!;

backend/src/data/entities/Reminder.ts

@@ -16,4 +16,6 @@ export class Reminder {
   @Column() body: string;
 
   @Column() created_at: string;
+
+  @Column() source_message_id: string;
 }

backend/src/migrations/1631494429170-AddSourceMessageIdToReminders.ts

@@ -0,0 +1,19 @@
+import { MigrationInterface, QueryRunner, TableColumn } from "typeorm";
+
+export class AddSourceMessageIdToReminders1631494429170 implements MigrationInterface {
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.addColumns("reminders", [
+      new TableColumn({
+        name: "source_message_id",
+        type: "bigint",
+        isNullable: true,
+        default: null,
+        unsigned: true,
+      }),
+    ]);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.dropColumn("reminders", "source_message_id");
+  }
+}

backend/src/plugins/Reminders/commands/RemindCmd.ts

@@ -57,6 +57,7 @@ export const RemindCmd = remindersCmd({
       reminderTime.clone().tz("Etc/UTC").format("YYYY-MM-DD HH:mm:ss"),
       reminderBody,
       moment.utc().format("YYYY-MM-DD HH:mm:ss"),
+      args.reminder ? msg.id : undefined,
     );
 
     registerUpcomingReminder(reminder);