Add automatic job scheduling and rescheduling

- Add scheduleEmailProcessingJob helper to check and schedule jobs on init
- Only schedule if no existing uncompleted job exists
- Update job handler to always reschedule itself after completion (5min interval)
- Job reschedules regardless of success/failure for continuous processing
- Initial job starts 1 minute after init, subsequent jobs every 5 minutes

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/plugin.ts

@@ -4,6 +4,47 @@ import { MailingService } from './services/MailingService.js'
 import { createEmailTemplatesCollection } from './collections/EmailTemplates.js'
 import Emails from './collections/Emails.js'
 
+// Helper function to schedule the email processing job
+async function scheduleEmailProcessingJob(payload: any, queueName: string): Promise<void> {
+  const jobSlug = 'process-email-queue'
+
+  // Check if there's already a scheduled job for this task
+  const existingJobs = await payload.find({
+    collection: 'payload-jobs',
+    where: {
+      and: [
+        {
+          taskSlug: {
+            equals: jobSlug,
+          },
+        },
+        {
+          hasCompleted: {
+            equals: false,
+          },
+        },
+      ],
+    },
+    limit: 1,
+  })
+
+  // If no existing job, schedule a new one
+  if (existingJobs.docs.length === 0) {
+    await payload.create({
+      collection: 'payload-jobs',
+      data: {
+        taskSlug: jobSlug,
+        input: {},
+        queue: queueName,
+        waitUntil: new Date(Date.now() + 60000), // Start in 1 minute
+      },
+    })
+    console.log(`🔄 Scheduled email processing job in queue: ${queueName}`)
+  } else {
+    console.log(`✅ Email processing job already scheduled in queue: ${queueName}`)
+  }
+}
+
 export const mailingPlugin = (pluginConfig: MailingPluginConfig) => (config: Config): Config => {
   const queueName = pluginConfig.queue || 'default'
 
@@ -80,8 +121,11 @@ export const mailingPlugin = (pluginConfig: MailingPluginConfig) => (config: Con
         {
           slug: 'process-email-queue',
           handler: async ({ job, req }: { job: any; req: any }) => {
+            const payload = (req as any).payload
+            let jobResult = null
+
             try {
-              const mailingService = new MailingService((req as any).payload, pluginConfig)
+              const mailingService = new MailingService(payload, pluginConfig)
 
               console.log('🔄 Processing email queue (pending + failed emails)...')
 
@@ -91,19 +135,43 @@ export const mailingPlugin = (pluginConfig: MailingPluginConfig) => (config: Con
               // Then retry failed emails
               await mailingService.retryFailedEmails()
 
-              return {
+              jobResult = {
                 output: {
                   success: true,
                   message: 'Email queue processed successfully (pending and failed emails)'
                 }
               }
+
+              console.log('✅ Email queue processing completed successfully')
+
             } catch (error) {
               console.error('❌ Error processing email queue:', error)
               const errorMessage = error instanceof Error ? error.message : 'Unknown error'
 
-              // Properly fail the job by throwing the error
-              throw new Error(`Email queue processing failed: ${errorMessage}`)
+              jobResult = new Error(`Email queue processing failed: ${errorMessage}`)
             }
+
+            // Always reschedule the next job (success or failure)
+            try {
+              await payload.create({
+                collection: 'payload-jobs',
+                data: {
+                  taskSlug: 'process-email-queue',
+                  input: {},
+                  queue: queueName,
+                  waitUntil: new Date(Date.now() + 300000), // Reschedule in 5 minutes
+                },
+              })
+              console.log(`🔄 Rescheduled next email processing job in ${queueName} queue`)
+            } catch (rescheduleError) {
+              console.error('❌ Failed to reschedule email processing job:', rescheduleError)
+            }
+
+            // Return the original result or throw the error
+            if (jobResult instanceof Error) {
+              throw jobResult
+            }
+            return jobResult
           },
           interfaceName: 'ProcessEmailQueueJob',
         },
@@ -130,6 +198,13 @@ export const mailingPlugin = (pluginConfig: MailingPluginConfig) => (config: Con
 
       console.log('PayloadCMS Mailing Plugin initialized successfully')
 
+      // Schedule the email processing job if not already scheduled
+      try {
+        await scheduleEmailProcessingJob(payload, queueName)
+      } catch (error) {
+        console.error('Failed to schedule email processing job:', error)
+      }
+
       // Call onReady callback if provided
       if (pluginConfig.onReady) {
         await pluginConfig.onReady(payload)