Added redis and worker services

backend/src/queues/birdMilestoneReminderQueue.ts

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+import { Queue, type Job } from 'bullmq';
+
+import { redisConnection } from './redisConnection.js';
+
+export type BirdMilestoneReminderJobData = {
+  runDate: string;
+  requestedBy: 'scheduler';
+};
+
+export type BirdMilestoneReminderJobResult = {
+  runDate: string;
+  checked: number;
+  sent: number;
+  skipped: number;
+  failed: number;
+};
+
+export const birdMilestoneReminderQueueName = 'bird-milestone-reminders';
+
+export const birdMilestoneReminderQueue = new Queue<BirdMilestoneReminderJobData, BirdMilestoneReminderJobResult>(
+  birdMilestoneReminderQueueName,
+  {
+    connection: redisConnection,
+    defaultJobOptions: {
+      attempts: 3,
+      backoff: {
+        type: 'exponential',
+        delay: 60_000,
+      },
+      removeOnComplete: 100,
+      removeOnFail: 1_000,
+    },
+  },
+);
+
+export const enqueueBirdMilestoneReminderJob = (runDate: string): Promise<Job<BirdMilestoneReminderJobData, BirdMilestoneReminderJobResult>> =>
+  birdMilestoneReminderQueue.add(
+    'run-daily-reminders',
+    {
+      runDate,
+      requestedBy: 'scheduler',
+    },
+    {
+      jobId: `bird-milestone-reminders:${runDate}`,
+    },
+  );
+
+export const closeBirdMilestoneReminderQueue = async () => {
+  await birdMilestoneReminderQueue.close();
+};
+
+export const getBirdMilestoneReminderQueueCounts = () =>
+  birdMilestoneReminderQueue.getJobCounts('waiting', 'active', 'delayed', 'completed', 'failed');

backend/src/queues/redisConnection.ts

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+import type { RedisOptions } from 'bullmq';
+
+const redisUrl = process.env.REDIS_URL?.trim() || 'redis://localhost:6379';
+
+const parseRedisConnection = (): RedisOptions => {
+  const url = new URL(redisUrl);
+  const db = url.pathname && url.pathname !== '/' ? Number(url.pathname.slice(1)) : undefined;
+
+  return {
+    host: url.hostname,
+    port: url.port ? Number(url.port) : 6379,
+    username: url.username ? decodeURIComponent(url.username) : undefined,
+    password: url.password ? decodeURIComponent(url.password) : undefined,
+    db: Number.isFinite(db) ? db : undefined,
+    maxRetriesPerRequest: null,
+  };
+};
+
+export const redisConnection = parseRedisConnection();