background task

docs/user-stories/background-email-processing.md

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+# Background Email Processing User Stories & Acceptance Criteria
+
+## User Stories
+
+### Primary User Stories
+
+#### 1. Automated Email Processing
+**As a** user with configured email folders  
+**I want** my emails to be automatically processed in the background  
+**So that** I don't have to manually trigger email organization
+
+**Acceptance Criteria:**
+- [ ] Background task runs periodically to process emails for all users
+- [ ] Only processes emails in folders with `organize_enabled = true`
+- [ ] Processes emails according to all folder rules, moving emails as needed to the appropriate folder
+- [ ] Respects priority field for folders
+- [ ] Marks processed emails to avoid reprocessing
+- [ ] Updates folder pending counts after processing
+- [ ] Handles processing errors gracefully without stopping other folders
+- [ ] Respects folder priority when processing (high priority first)
+
+#### 2. Email Processing Status Tracking
+**As a** user  
+**I want** to see the status of email processing  
+**So that** I can understand how many emails are pending organization
+
+**Acceptance Criteria:**
+- [ ] Pending email count is displayed for each folder
+- [ ] Count updates in real-time after processing
+- [ ] Processed email tracking prevents duplicate processing
+- [ ] Email processing history is maintained
+
+#### 3. Batch Email Processing
+**As a** user with many emails  
+**I want** emails to be processed in batches  
+**So that** the system doesn't become unresponsive with large mailboxes
+
+**Acceptance Criteria:**
+- [ ] Emails are processed in configurable batch sizes
+- [ ] Processing progress is tracked per batch
+- [ ] Failed batches don't affect other batches
+- [ ] System resources are managed efficiently during processing
+
+#### 4. Error Handling & Recovery
+**As a** user  
+**I want** email processing errors to be handled gracefully  
+**So that** temporary issues don't stop all email organization
+
+**Acceptance Criteria:**
+- [ ] Individual email processing failures don't stop folder processing
+- [ ] Connection errors to IMAP servers are retried
+- [ ] Transient errors are logged but don't halt processing
+- [ ] Permanent failures are flagged for user attention
+- [ ] Error notifications are sent for critical failures
+
+#### 5. Processing Controls
+**As a** user  
+**I want** control over when emails are processed  
+**So that** I can manage processing during preferred times
+
+**Acceptance Criteria:**
+- [ ] Users can enable/disable automatic processing per folder
+- [ ] Users can trigger manual processing for specific folders
+- [ ] Processing can be paused and resumed
+- [ ] Processing schedule can be configured
+
+### Secondary User Stories
+
+#### 6. Performance Monitoring
+**As a** system administrator  
+**I want** to monitor email processing performance  
+**So that** I can identify and resolve bottlenecks
+
+**Acceptance Criteria:**
+- [ ] Processing time metrics are collected
+- [ ] Success/failure rates are tracked
+- [ ] Resource usage during processing is monitored
+- [ ] Performance alerts are sent for degraded performance
+
+#### 7. Accessibility
+**As a** user with disabilities  
+**I want** email processing status to be accessible  
+**So that** I can understand processing through assistive technologies
+
+**Acceptance Criteria:**
+- [ ] Processing status updates are announced by screen readers
+- [ ] Visual indicators have proper contrast ratios
+- [ ] Processing notifications are keyboard navigable
+- [ ] Error messages are clear and descriptive
+
+## Technical Requirements
+
+### Backend Requirements
+- [ ] Background task scheduler implementation
+- [ ] IMAP connection management for processing
+- [ ] Email processing logic with rule evaluation
+- [ ] Processed email tracking system
+- [ ] Error handling and logging mechanisms
+- [ ] Performance monitoring and metrics collection
+
+### Frontend Requirements
+- [ ] Pending email count display
+- [ ] Processing status indicators
+- [ ] Manual processing controls
+- [ ] Error notification UI
+- [ ] Real-time updates for processing status
+
+### Integration Requirements
+- [ ] Integration with IMAP service for email access
+- [ ] Integration with folder management system
+- [ ] Integration with processed emails tracking
+- [ ] API endpoints for manual processing controls
+
+## Non-Functional Requirements
+
+### Performance
+- Process emails at a rate of at least 10 emails per second
+- Background task execution interval configurable (default: 5 minutes)
+- Memory usage capped to prevent system resource exhaustion
+- Processing of large mailboxes (100k+ emails) completes without timeouts
+
+### Reliability
+- 99.5% uptime for background processing
+- Automatic recovery from transient errors
+- Graceful degradation when external services are unavailable
+- Data consistency maintained during processing failures
+
+### Scalability
+- Support for 1000+ concurrent users
+- Horizontal scaling of processing workers
+- Efficient database queries for email tracking
+- Load balancing of processing tasks across workers