diff --git a/.kiro/specs/audit-logging-system/.config.kiro b/.kiro/specs/audit-logging-system/.config.kiro
new file mode 100644
index 0000000..66da147
--- /dev/null
+++ b/.kiro/specs/audit-logging-system/.config.kiro
@@ -0,0 +1 @@
+{"specId": "audit-logging-system", "workflowType": "requirements-first", "specType": "feature"}
\ No newline at end of file
diff --git a/.kiro/specs/audit-logging-system/design.md b/.kiro/specs/audit-logging-system/design.md
new file mode 100644
index 0000000..8721d2c
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+++ b/.kiro/specs/audit-logging-system/design.md
@@ -0,0 +1,95 @@
+# Design Document
+
+## Overview
+
+This design implements a comprehensive audit logging system for recording notification lifecycle events with immutability and queryability guarantees.
+
+## Architecture
+
+### Data Model
+
+```typescript
+interface AuditLogEntry {
+  entryId: string;              // Unique identifier
+  notificationId: string;       // Reference to notification
+  timestamp: number;            // Unix timestamp
+  eventType: EventType;         // CREATION, DELIVERY_ATTEMPT, etc.
+  actor: string;                // Address or identifier
+  status: 'success' | 'failure'; // Operation status
+  metadata: {
+    recipient?: string;
+    channel?: string;
+    errorReason?: string;
+    retryCount?: number;
+    [key: string]: any;          // Flexible for event-specific data
+  };
+  createdAt: number;            // When log was created
+  immutable: true;              // Flag indicating immutability
+}
+
+enum EventType {
+  CREATION = 'CREATION',
+  DELIVERY_ATTEMPT = 'DELIVERY_ATTEMPT',
+  DELIVERY_SUCCESS = 'DELIVERY_SUCCESS',
+  DELIVERY_FAILURE = 'DELIVERY_FAILURE',
+  ACKNOWLEDGMENT = 'ACKNOWLEDGMENT'
+}
+```
+
+### Storage Strategy
+
+1. **Primary Storage**: Database/persistent store for all audit logs
+2. **Indexing**: Create indexes on notificationId, recipient, eventType, timestamp
+3. **Archival**: Move logs older than retention period to archive
+4. **Performance**: Use read-optimized queries for audit log retrieval
+
+### Query Interface
+
+```typescript
+interface AuditLogQuery {
+  notificationId?: string;
+  recipient?: string;
+  eventType?: EventType | EventType[];
+  dateRange?: {
+    startTime: number;
+    endTime: number;
+  };
+  actor?: string;
+  limit?: number;     // Default 100, max 1000
+  offset?: number;    // For pagination
+}
+
+interface QueryResult {
+  entries: AuditLogEntry[];
+  total: number;
+  hasMore: boolean;
+}
+```
+
+### Integration Points
+
+1. **Event Subscriber**: Log CREATION events
+2. **Discord Service**: Log DELIVERY_ATTEMPT, DELIVERY_SUCCESS, DELIVERY_FAILURE
+3. **Notification Expiration**: Log EXPIRATION events
+4. **API Endpoints**: Provide query interface for clients
+
+### Immutability Enforcement
+
+- No UPDATE operations on audit logs
+- DELETE only through archive/purge administrative functions
+- Logs stored in append-only structure
+- Database constraints to prevent modification
+
+## Performance Considerations
+
+- Indexes on query fields (notificationId, recipient, eventType, timestamp)
+- Pagination for large queries
+- Cache frequently accessed audit logs
+- Archive old logs to separate storage
+
+## Compliance and Retention
+
+- Default retention: 365 days
+- Configurable retention policy
+- Audit trails for who accessed what logs
+- Compliance reporting endpoints
\ No newline at end of file
diff --git a/.kiro/specs/audit-logging-system/requirements.md b/.kiro/specs/audit-logging-system/requirements.md
new file mode 100644
index 0000000..7e75e1f
--- /dev/null
+++ b/.kiro/specs/audit-logging-system/requirements.md
@@ -0,0 +1,97 @@
+# Requirements Document
+
+## Introduction
+
+This feature creates an audit logging system that records notification lifecycle events for compliance and operational monitoring, enabling complete visibility into delivery attempts and outcomes.
+
+## Glossary
+
+- **Audit Log**: Immutable record of notification lifecycle events
+- **Lifecycle Event**: Creation, delivery attempt, delivery failure, acknowledgment
+- **Audit Record**: Single entry in the audit log with timestamp and event details
+- **Query Endpoint**: API or function to retrieve and filter audit logs
+- **Immutable**: Cannot be modified or deleted after creation
+- **Compliance**: Meeting regulatory and operational requirements
+
+## Requirements
+
+### Requirement 1: Audit Event Schema
+
+**User Story:** As a compliance officer, I want a well-defined audit event schema, so that all events are recorded consistently.
+
+#### Acceptance Criteria
+
+1. THE audit event schema SHALL include: eventId, notificationId, timestamp, eventType, actor, status, metadata
+2. THE eventType SHALL be one of: CREATION, DELIVERY_ATTEMPT, DELIVERY_SUCCESS, DELIVERY_FAILURE, ACKNOWLEDGMENT
+3. THE actor field SHALL identify who/what triggered the event
+4. THE metadata field SHALL be flexible JSON object for event-specific data
+5. ALL fields SHALL be optional except eventId, timestamp, and eventType
+
+### Requirement 2: Creation Event Logging
+
+**User Story:** As an auditor, I want to see when notifications are created, so that I can track notification lifecycle start.
+
+#### Acceptance Criteria
+
+1. WHEN a notification is created, THE system SHALL log a CREATION event
+2. THE CREATION event SHALL include: notificationId, creator address, recipient, title, content
+3. THE CREATION event SHALL be logged before notification is marked active
+4. THE event SHALL not be lost even if creation partially fails
+
+### Requirement 3: Delivery Attempt Logging
+
+**User Story:** As an operations manager, I want to see all delivery attempts, so that I can troubleshoot delivery issues.
+
+#### Acceptance Criteria
+
+1. WHEN delivery is attempted, THE system SHALL log a DELIVERY_ATTEMPT event
+2. THE DELIVERY_ATTEMPT event SHALL include: notificationId, recipient, channel (Discord, etc.), timestamp
+3. IF delivery succeeds, THE system SHALL log DELIVERY_SUCCESS event
+4. IF delivery fails, THE system SHALL log DELIVERY_FAILURE event with error reason
+5. EACH delivery attempt SHALL be logged independently
+
+### Requirement 4: Failure Logging
+
+**User Story:** As a support engineer, I want detailed failure logs, so that I can diagnose delivery problems.
+
+#### Acceptance Criteria
+
+1. WHEN delivery fails, THE system SHALL log failure reason/error message
+2. THE failure log SHALL include: error type, error message, retry count, next retry time (if applicable)
+3. RETRIES SHALL be logged as separate events
+4. FAILURE logs SHALL be retained for troubleshooting
+
+### Requirement 5: Acknowledgment Logging
+
+**User Story:** As a product manager, I want to see when notifications are acknowledged, so that I can track user engagement.
+
+#### Acceptance Criteria
+
+1. WHEN a notification is acknowledged, THE system SHALL log an ACKNOWLEDGMENT event
+2. THE ACKNOWLEDGMENT event SHALL include: notificationId, recipient, timestamp
+3. MULTIPLE acknowledgments for same notification SHALL be supported
+4. ACKNOWLEDGMENT timing relative to delivery SHALL be trackable
+
+### Requirement 6: Query Endpoints
+
+**User Story:** As a system user, I want to query audit logs, so that I can analyze notification history.
+
+#### Acceptance Criteria
+
+1. THE system SHALL provide query endpoint for retrieving audit logs
+2. QUERIES SHALL support filtering by: notificationId, recipient, eventType, dateRange, actor
+3. QUERIES SHALL return results in chronological order
+4. QUERIES SHALL support pagination for large result sets
+5. QUERIES SHALL be fast (sub-second response times)
+
+### Requirement 7: Immutability and Retention
+
+**User Story:** As a compliance manager, I want audit logs to be immutable, so that historical records cannot be tampered with.
+
+#### Acceptance Criteria
+
+1. AUDIT logs SHALL NOT be modifiable or deletable after creation
+2. AUDIT logs SHALL be retained for minimum 365 days
+3. ARCHIVED logs older than retention period MAY be removed
+4. RETENTION policy SHALL be configurable
+5. DELETION of logs SHALL only be allowed through privileged administrative function
\ No newline at end of file
diff --git a/.kiro/specs/audit-logging-system/tasks.md b/.kiro/specs/audit-logging-system/tasks.md
new file mode 100644
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--- /dev/null
+++ b/.kiro/specs/audit-logging-system/tasks.md
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+# Implementation Plan: audit-logging-system
+
+## Overview
+
+This implementation plan creates a comprehensive audit logging system for recording notification lifecycle events with queryability and immutability guarantees.
+
+## Tasks
+
+- [ ] 1. Define audit log data structures
+  - [ ] 1.1 Create AuditLogEntry interface
+    - Fields: entryId, notificationId, timestamp, eventType, actor, status, metadata
+    - _Requirements: 1.1, 1.2_
+
+  - [ ] 1.2 Create EventType enum
+    - Values: CREATION, DELIVERY_ATTEMPT, DELIVERY_SUCCESS, DELIVERY_FAILURE, ACKNOWLEDGMENT
+    - _Requirements: 1.2_
+
+  - [ ] 1.3 Create AuditLogQuery interface for filtering
+    - Fields: notificationId, recipient, eventType, dateRange, actor, limit, offset
+    - _Requirements: 6.2_
+
+  - [ ] 1.4 Create QueryResult interface
+    - Fields: entries, total, hasMore
+    - _Requirements: 6.2, 6.4_
+
+- [ ] 2. Implement audit log storage
+  - [ ] 2.1 Create database schema for audit logs
+    - Table/collection structure
+    - Indexes on query fields
+    - _Requirements: 6.1, 6.5_
+
+  - [ ] 2.2 Implement append-only storage pattern
+    - Ensure logs cannot be modified
+    - Enforce immutability at storage level
+    - _Requirements: 7.1, 7.2_
+
+  - [ ] 2.3 Configure retention policy
+    - Default 365 days
+    - Configurable per deployment
+    - _Requirements: 7.2, 7.4_
+
+  - [ ] 2.4 Implement archival mechanism
+    - Move old logs to archive storage
+    - Maintain query access to archived logs
+    - _Requirements: 7.3_
+
+- [ ] 3. Implement AuditLogger service
+  - [ ] 3.1 Create AuditLogger class
+    - Methods: logCreation(), logDeliveryAttempt(), logDeliverySuccess(), logDeliveryFailure(), logAcknowledgment()
+    - Persist all events to database
+    - _Requirements: 2.1, 3.1, 4.1, 5.1_
+
+  - [ ] 3.2 Implement logCreation() method
+    - Accept: notificationId, creator, recipient, title, content
+    - Log CREATION event with metadata
+    - _Requirements: 2.1, 2.2, 2.3, 2.4_
+
+  - [ ] 3.3 Implement logDeliveryAttempt() method
+    - Accept: notificationId, recipient, channel
+    - Log DELIVERY_ATTEMPT event
+    - _Requirements: 3.1, 3.2, 3.3_
+
+  - [ ] 3.4 Implement logDeliverySuccess() method
+    - Accept: notificationId, recipient, channel
+    - Log DELIVERY_SUCCESS event
+    - _Requirements: 3.3, 3.4_
+
+  - [ ] 3.5 Implement logDeliveryFailure() method
+    - Accept: notificationId, recipient, channel, errorReason, retryCount
+    - Log DELIVERY_FAILURE event
+    - _Requirements: 3.4, 4.1, 4.2, 4.3, 4.4_
+
+  - [ ] 3.6 Implement logAcknowledgment() method
+    - Accept: notificationId, recipient
+    - Log ACKNOWLEDGMENT event
+    - _Requirements: 5.1, 5.2, 5.3_
+
+- [ ] 4. Implement query interface
+  - [ ] 4.1 Create queryAuditLogs() function
+    - Accept AuditLogQuery parameters
+    - Return QueryResult with entries and pagination
+    - _Requirements: 6.1, 6.2, 6.3, 6.4_
+
+  - [ ] 4.2 Implement filtering by notificationId
+    - Query all events for a specific notification
+    - _Requirements: 6.2_
+
+  - [ ] 4.3 Implement filtering by recipient
+    - Query all events for a specific recipient
+    - _Requirements: 6.2_
+
+  - [ ] 4.4 Implement filtering by eventType
+    - Query events of specific type(s)
+    - Support multiple types in single query
+    - _Requirements: 6.2_
+
+  - [ ] 4.5 Implement filtering by dateRange
+    - Query events within time period
+    - _Requirements: 6.2_
+
+  - [ ] 4.6 Implement filtering by actor
+    - Query events by who triggered them
+    - _Requirements: 6.2_
+
+  - [ ] 4.7 Implement pagination support
+    - Support limit and offset parameters
+    - Return hasMore flag for client
+    - _Requirements: 6.4_
+
+- [ ] 5. Integrate logging into event processing
+  - [ ] 5.1 Update EventSubscriber to log CREATION
+    - Call auditLogger.logCreation() when processing new notification
+    - _Requirements: 2.1, 2.2_
+
+  - [ ] 5.2 Update EventSubscriber to log failures
+    - Log when event processing fails
+    - Include error details
+    - _Requirements: 4.1, 4.2_
+
+  - [ ] 5.3 Update DiscordNotificationService to log delivery attempts
+    - Log DELIVERY_ATTEMPT before sending
+    - Log DELIVERY_SUCCESS if successful
+    - Log DELIVERY_FAILURE if unsuccessful
+    - _Requirements: 3.1, 3.2, 3.3, 3.4_
+
+  - [ ] 5.4 Add notification expiration logging
+    - Log when notifications expire
+    - Include expiration details in metadata
+    - _Requirements: 2.1_
+
+- [ ] 6. Create API endpoints for audit queries
+  - [ ] 6.1 Create GET /audit-logs endpoint
+    - Query audit logs with filters
+    - Support query parameters: notificationId, recipient, eventType, startTime, endTime, limit, offset
+    - _Requirements: 6.1, 6.2, 6.3, 6.4_
+
+  - [ ] 6.2 Create GET /audit-logs/:notificationId endpoint
+    - Get all audit logs for a specific notification
+    - Return full lifecycle
+    - _Requirements: 6.1, 6.2, 6.3_
+
+  - [ ] 6.3 Create GET /audit-logs/recipient/:recipient endpoint
+    - Get all audit logs for a specific recipient
+    - _Requirements: 6.1, 6.2_
+
+  - [ ] 6.4 Create GET /audit-logs/stats endpoint
+    - Return audit log statistics
+    - Include: total events, events by type, date range, etc.
+    - _Requirements: 6.1_
+
+- [ ] 7. Implement immutability guarantees
+  - [ ] 7.1 Add database constraints to prevent modification
+    - Use NOT NULL constraints on immutable field
+    - Add trigger to prevent UPDATE operations
+    - _Requirements: 7.1_
+
+  - [ ] 7.2 Implement access control for deletion
+    - Only administrators can purge old logs
+    - Require authorization for deletion
+    - _Requirements: 7.5_
+
+  - [ ] 7.3 Add audit trail for admin actions
+    - Log who accessed audit logs and when
+    - _Requirements: 7.1_
+
+- [ ] 8. Create unit tests
+  - [ ] 8.1 Create audit-logger.test.ts
+    - Test each logging method
+    - Test event creation with correct metadata
+    - _Requirements: All_
+
+  - [ ] 8.2 Test logCreation()
+    - Verify event is logged with correct details
+    - _Requirements: 2.1, 2.2, 2.3, 2.4_
+
+  - [ ] 8.3 Test logDeliveryAttempt()
+    - Verify event is logged before delivery
+    - _Requirements: 3.1, 3.2_
+
+  - [ ] 8.4 Test logDeliverySuccess()
+    - Verify success event is logged
+    - _Requirements: 3.3_
+
+  - [ ] 8.5 Test logDeliveryFailure()
+    - Verify failure event with error details
+    - _Requirements: 4.1, 4.2, 4.3_
+
+  - [ ] 8.6 Test logAcknowledgment()
+    - Verify acknowledgment event is logged
+    - _Requirements: 5.1, 5.2_
+
+- [ ] 9. Create query tests
+  - [ ] 9.1 Create audit-query.test.ts
+    - Test query interface
+    - _Requirements: 6.1, 6.2, 6.3, 6.4_
+
+  - [ ] 9.2 Test query by notificationId
+    - Verify correct logs returned
+    - _Requirements: 6.2_
+
+  - [ ] 9.3 Test query by recipient
+    - Verify correct logs returned
+    - _Requirements: 6.2_
+
+  - [ ] 9.4 Test query by eventType
+    - Test single and multiple types
+    - _Requirements: 6.2_
+
+  - [ ] 9.5 Test query by dateRange
+    - Verify only logs in range returned
+    - _Requirements: 6.2_
+
+  - [ ] 9.6 Test pagination
+    - Verify limit and offset work correctly
+    - Verify hasMore flag accurate
+    - _Requirements: 6.4_
+
+  - [ ] 9.7 Test query performance
+    - Verify sub-second response times
+    - _Requirements: 6.5_
+
+- [ ] 10. Create integration tests
+  - [ ] 10.1 Create audit-integration.test.ts
+    - End-to-end test of notification lifecycle logging
+    - _Requirements: All_
+
+  - [ ] 10.2 Test complete notification lifecycle
+    - Create → Deliver → Acknowledge
+    - Verify all events logged in order
+    - _Requirements: 2.1, 3.1, 4.1, 5.1_
+
+  - [ ] 10.3 Test failure and retry scenario
+    - Delivery attempt → Failure → Retry → Success
+    - Verify all events logged with correct context
+    - _Requirements: 3.1, 4.1, 4.3_
+
+  - [ ] 10.4 Test immutability
+    - Attempt to modify audit log entry
+    - Verify error is returned
+    - _Requirements: 7.1_
+
+  - [ ] 10.5 Test retention policy
+    - Create old entries
+    - Verify they are archived/removed per policy
+    - _Requirements: 7.2, 7.3, 7.4_
+
+- [ ] 11. Create documentation
+  - [ ] 11.1 Document audit log schema
+    - List all fields and types
+    - Explain each event type
+    - _Requirements: 1.1, 1.2_
+
+  - [ ] 11.2 Document query API
+    - Provide examples for each query type
+    - Document filter syntax
+    - _Requirements: 6.1, 6.2, 6.3, 6.4_
+
+  - [ ] 11.3 Document retention policy
+    - Explain default and custom retention
+    - Document archival process
+    - _Requirements: 7.2, 7.4_
+
+  - [ ] 11.4 Document compliance features
+    - Explain immutability guarantees
+    - Document audit trail for admin access
+    - _Requirements: 7.1, 7.5_
+
+- [ ] 12. Final testing checkpoint
+  - [ ] 12.1 Run all tests
+    - Ensure no regressions
+    - Verify all requirements met
+    - _Requirements: All_
+
+  - [ ] 12.2 Performance testing
+    - Measure query times
+    - Verify performance meets requirements
+    - _Requirements: 6.5_
+
+  - [ ] 12.3 Compliance verification
+    - Verify immutability enforcement
+    - Test retention policy
+    - _Requirements: 7.1, 7.2, 7.3, 7.4, 7.5_
+
+## Notes
+
+- Audit logs should be append-only to ensure immutability
+- All lifecycle events should be logged regardless of success/failure
+- Query performance is critical - proper indexing is essential
+- Retention policy must be configurable and enforced
+- Consider separate storage/archival for old logs
+- Compliance and regulatory requirements may require additional fields
\ No newline at end of file
diff --git a/.kiro/specs/notification-expiration/.config.kiro b/.kiro/specs/notification-expiration/.config.kiro
new file mode 100644
index 0000000..ecd5bd5
--- /dev/null
+++ b/.kiro/specs/notification-expiration/.config.kiro
@@ -0,0 +1 @@
+{"specId": "notification-expiration", "workflowType": "requirements-first", "specType": "feature"}
\ No newline at end of file
diff --git a/.kiro/specs/notification-expiration/design.md b/.kiro/specs/notification-expiration/design.md
new file mode 100644
index 0000000..29b8a48
--- /dev/null
+++ b/.kiro/specs/notification-expiration/design.md
@@ -0,0 +1,77 @@
+# Design Document
+
+## Overview
+
+This design implements notification expiration for the Notify-Chain listener. Notifications will store an expiration timestamp and the processing pipeline will check and skip expired notifications.
+
+## Architecture
+
+### Components
+
+1. **NotificationExpirationService** - Core service for checking expiration
+2. **ExpirationConfig** - Configuration for expiration settings
+3. **Event Registry Update** - Store expiration with events
+
+### Data Model
+
+```
+NotificationExpiration {
+  createdAt: number (timestamp)
+  expiresAt: number (timestamp)
+}
+
+EventStore extends with expiration {
+  ...existing fields
+  expiresAt?: number (optional - if not set, uses default)
+}
+```
+
+## Implementation Details
+
+### 1. Expiration Service
+
+```typescript
+interface ExpirationConfig {
+  defaultExpirationMs: number;  // Default 24 hours
+  perEventTypeExpiration: Record<string, number>;
+  enabled: boolean;             // If false, no expiration checks
+}
+
+class NotificationExpirationService {
+  constructor(config: ExpirationConfig)
+  
+  isExpired(event: EventResponse): boolean
+  shouldProcess(event: EventResponse): boolean
+  getExpirationTime(eventType?: string): number
+}
+```
+
+### 2. Integration Points
+
+- **EventSubscriber.shouldProcessEvent()** - Add expiration check
+- **DiscordNotificationService** - Check expiration before sending
+- **Config** - Add expiration configuration options
+
+### 3. Configuration
+
+```typescript
+interface Config {
+  // ... existing fields
+  expiration?: {
+    defaultExpirationMs: number;
+    perEventTypeExpiration: Record<string, number>;
+    enabled: boolean;
+  };
+}
+```
+
+## Default Values
+
+- `defaultExpirationMs`: 24 * 60 * 60 * 1000 (24 hours)
+- `enabled`: true
+
+## Testing Strategy
+
+1. Unit tests for NotificationExpirationService
+2. Integration tests for expiration in EventSubscriber
+3. Edge cases: null expiration, very long expiration, past expiration
\ No newline at end of file
diff --git a/.kiro/specs/notification-expiration/requirements.md b/.kiro/specs/notification-expiration/requirements.md
new file mode 100644
index 0000000..57a2a00
--- /dev/null
+++ b/.kiro/specs/notification-expiration/requirements.md
@@ -0,0 +1,56 @@
+# Requirements Document
+
+## Introduction
+
+This feature implements expiration support to prevent outdated notifications from being processed or delivered. It ensures notifications have a valid time window and are filtered out once expired.
+
+## Glossary
+
+- **Notification**: A message sent to users about blockchain events
+- **Expiration Timestamp**: The time after which a notification is no longer valid
+- **Processed Notification**: A notification that has been handled by the notification service
+- **Event Timestamp**: The time when the blockchain event occurred
+
+## Requirements
+
+### Requirement 1: Expiration Timestamp Storage
+
+**User Story:** As a system administrator, I want notifications to store an expiration timestamp, so that I can control how long notifications remain valid.
+
+#### Acceptance Criteria
+
+1. WHEN a notification is created, THE system SHALL store an expiration timestamp
+2. THE expiration timestamp SHALL be configurable per notification type
+3. DEFAULT expiration time SHALL be 24 hours from notification creation if not specified
+
+### Requirement 2: Expiration Validation
+
+**User Story:** As a system administrator, I want expired notifications to be blocked from processing, so that outdated notifications don't reach users.
+
+#### Acceptance Criteria
+
+1. WHEN a notification is about to be processed, THE system SHALL check if the current time exceeds the expiration timestamp
+2. IF the notification is expired, THE system SHALL skip processing and log the expiration
+3. IF the notification is expired, THE system SHALL NOT send the notification to any channel (Discord, etc.)
+4. EXPIRED notifications SHALL be recorded in the audit log with "EXPIRED" status
+
+### Requirement 3: Unit Test Coverage
+
+**User Story:** As a developer, I want expiration checks to be covered by unit tests, so that the expiration logic works correctly.
+
+#### Acceptance Criteria
+
+1. UNIT tests SHALL verify that expired notifications are not processed
+2. UNIT tests SHALL verify that valid notifications are processed
+3. UNIT tests SHALL verify the default expiration time behavior
+4. UNIT tests SHALL cover edge cases (null expiration, very long expiration, etc.)
+
+### Requirement 4: Configuration Options
+
+**User Story:** As a system administrator, I want to configure expiration settings, so that different notification types can have different validity periods.
+
+#### Acceptance Criteria
+
+1. THE system SHALL allow configuring default expiration time via configuration
+2. THE system SHALL allow setting per-event-type expiration times
+3. THE configuration SHALL support disabling expiration (infinite validity)
\ No newline at end of file
diff --git a/.kiro/specs/notification-expiration/tasks.md b/.kiro/specs/notification-expiration/tasks.md
new file mode 100644
index 0000000..4cb2174
--- /dev/null
+++ b/.kiro/specs/notification-expiration/tasks.md
@@ -0,0 +1,47 @@
+# Implementation Plan: notification-expiration
+
+## Overview
+
+This implementation plan adds expiration support to prevent outdated notifications from being processed or delivered.
+
+## Tasks
+
+- [-] 1. Add expiration configuration to types
+  - [x] 1.1 Add ExpirationConfig interface to Config type
+  - [x] 1.2 Add expiresAt field to AppCleanupConfig if applicable
+  - _Requirements: 1.1, 4.1, 4.2_
+
+- [-] 2. Create NotificationExpirationService
+  - [x] 2.1 Create src/services/notification-expiration.ts
+  - [x] 2.2 Implement isExpired() method
+  - [x] 2.3 Implement shouldProcess() method
+  - [x] 2.4 Implement getExpirationTime() method
+  - _Requirements: 2.1, 2.2, 2.3_
+
+- [x] 3. Update EventSubscriber to check expiration
+  - [x] 3.1 Integrate NotificationExpirationService in EventSubscriber
+  - [x] 3.2 Add expiration check in shouldProcessEvent()
+  - [x] 3.3 Log when notifications are skipped due to expiration
+  - _Requirements: 2.1, 2.2, 2.3_
+
+- [x] 4. Add unit tests
+  - [x] 4.1 Create notification-expiration.test.ts
+  - [x] 4.2 Test isExpired() with past time
+  - [x] 4.3 Test isExpired() with future time
+  - [x] 4.4 Test shouldProcess() returns false for expired
+  - [x] 4.5 Test shouldProcess() returns true for valid
+  - [x] 4.6 Test default expiration behavior
+  - [x] 4.7 Test per-event-type expiration
+  - _Requirements: 3.1, 3.2, 3.3, 3.4_
+
+- [x] 5. Update config schema if needed
+  - [x] 5.1 Add expiration to Config interface
+  - [x] 5.2 Update .env.example with expiration settings
+  - _Requirements: 4.1, 4.2, 4.3_
+
+## Notes
+
+- Default expiration: 24 hours (86400000 ms)
+- Check expiration after event validation but before notification sending
+- Log skipped notifications with "expired" reason
+- Support disabling expiration via config for backward compatibility
\ No newline at end of file
diff --git a/listener/.env.example b/listener/.env.example
index 1c63743..62d7192 100644
--- a/listener/.env.example
+++ b/listener/.env.example
@@ -67,3 +67,10 @@ RATE_LIMIT_CLIENT_OVERRIDES={}
 # ARCHIVE_AFTER_MS=604800000             # Archive notifications completed > X ms ago (default: 7 days)
 # ARCHIVE_DELETE_AFTER_MS=7776000000     # Permanently delete archive rows > X ms old (default: 90 days; 0 = never)
 # ARCHIVE_BATCH_SIZE=500                 # Max rows processed per cycle
+
+# Notification Expiration Configuration
+EXPIRATION_ENABLED=true
+EXPIRATION_DEFAULT_MS=86400000
+# Per-event-type expiration times in milliseconds (JSON object)
+# Example: {"notification_scheduled":3600000,"alert":604800000}
+# EXPIRATION_PER_EVENT_TYPE={}
diff --git a/listener/package-lock.json b/listener/package-lock.json
index 7631755..e691bc5 100644
--- a/listener/package-lock.json
+++ b/listener/package-lock.json
@@ -593,9 +593,9 @@
       }
     },
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-      "version": "4.9.1",
-      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.1.tgz",
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+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
+      "integrity": "sha512-cuadcxVFE8sDK6iWJbs8Sn0av2Nrh2QSGQhVlBW9AaAHqHwjWsZHT8LJ4hFGPh7ASBV2deFdM7H/DPjulmh8rg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -646,9 +646,9 @@
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     },
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-      "version": "1.1.15",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.15.tgz",
-      "integrity": "sha512-EwOCDEex4quD37XhqM3omwtMoJjr//isUZz1JopUNWms+4Z2ViyM/k1YIRePpoVNnQhENnxtFjLaxNHrT7xIUg==",
+      "version": "1.1.16",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.16.tgz",
+      "integrity": "sha512-IDw48K2/2kRkg9LdJxurvq3lV3aBgq0REY89duEqFRthjlPdXHKMj7EnQOXVckxzgisinf3nHfrcE2FufFLXMw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -703,9 +703,9 @@
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     },
     "node_modules/@humanwhocodes/config-array/node_modules/brace-expansion": {
-      "version": "1.1.15",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.15.tgz",
-      "integrity": "sha512-EwOCDEex4quD37XhqM3omwtMoJjr//isUZz1JopUNWms+4Z2ViyM/k1YIRePpoVNnQhENnxtFjLaxNHrT7xIUg==",
+      "version": "1.1.16",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.16.tgz",
+      "integrity": "sha512-IDw48K2/2kRkg9LdJxurvq3lV3aBgq0REY89duEqFRthjlPdXHKMj7EnQOXVckxzgisinf3nHfrcE2FufFLXMw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -790,9 +790,6 @@
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     },
     "node_modules/@istanbuljs/load-nyc-config/node_modules/js-yaml": {
-      "version": "3.14.2",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.2.tgz",
-      "integrity": "sha512-PMSmkqxr106Xa156c2M265Z+FTrPl+oxd/rgOQy2tijQeK5TxQ43psO1ZCwhVOSdnn+RzkzlRz/eY4BgJBYVpg==",
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@@ -918,9 +915,9 @@
       }
     },
     "node_modules/@jest/console/node_modules/@sinclair/typebox": {
-      "version": "0.27.10",
-      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.10.tgz",
-      "integrity": "sha512-MTBk/3jGLNB2tVxv6uLlFh1iu64iYOQ2PbdOSK3NW8JZsmlaOh2q6sdtKowBhfw8QFLmYNzTW4/oK4uATIi6ZA==",
+      "version": "0.27.12",
+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.12.tgz",
+      "integrity": "sha512-hhyNJ+nbR6ZR7pToHvllEFun9TL0sbL+tk/ON75lo+Xas054uez98qRbsuNt7MBCyZKK4+8Yli/OAGZhmfBZ/g==",
       "dev": true,
       "license": "MIT"
     },
@@ -1004,24 +1001,9 @@
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     "node_modules/@jest/core/node_modules/@sinclair/typebox": {
-      "version": "0.27.10",
-      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.10.tgz",
-      "integrity": "sha512-MTBk/3jGLNB2tVxv6uLlFh1iu64iYOQ2PbdOSK3NW8JZsmlaOh2q6sdtKowBhfw8QFLmYNzTW4/oK4uATIi6ZA==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/@jest/core/node_modules/jest-regex-util": {
-      "version": "29.6.3",
-      "resolved": "https://registry.npmjs.org/jest-regex-util/-/jest-regex-util-29.6.3.tgz",
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-      "dev": true,
-      "license": "MIT",
-      }
-    },
-    "node_modules/@jest/core/node_modules/@sinclair/typebox": {
-      "version": "0.27.10",
-      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.10.tgz",
-      "integrity": "sha512-MTBk/3jGLNB2tVxv6uLlFh1iu64iYOQ2PbdOSK3NW8JZsmlaOh2q6sdtKowBhfw8QFLmYNzTW4/oK4uATIi6ZA==",
+      "version": "0.27.12",
+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.12.tgz",
+      "integrity": "sha512-hhyNJ+nbR6ZR7pToHvllEFun9TL0sbL+tk/ON75lo+Xas054uez98qRbsuNt7MBCyZKK4+8Yli/OAGZhmfBZ/g==",
       "dev": true,
       "license": "MIT"
     },
@@ -1035,19 +1017,6 @@
         "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
       }
     },
-    "node_modules/@jest/create-cache-key-function": {
-      "version": "30.4.1",
-      "resolved": "https://registry.npmjs.org/@jest/create-cache-key-function/-/create-cache-key-function-30.4.1.tgz",
-      "integrity": "sha512-R+xGEtzA95NIsvpXJSROG4t01956dDOt17KpamguY4XOnGvdHNFFXE7Er0C1OAsRjOwiIxpKqOvGlznIGZIQlQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
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-      "engines": {
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     "node_modules/@jest/create-cache-key-function": {
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       "resolved": "https://registry.npmjs.org/@jest/create-cache-key-function/-/create-cache-key-function-30.4.1.tgz",
@@ -1109,9 +1078,9 @@
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     },
     "node_modules/@jest/environment/node_modules/@sinclair/typebox": {
-      "version": "0.27.10",
-      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.10.tgz",
-      "integrity": "sha512-MTBk/3jGLNB2tVxv6uLlFh1iu64iYOQ2PbdOSK3NW8JZsmlaOh2q6sdtKowBhfw8QFLmYNzTW4/oK4uATIi6ZA==",
+      "version": "0.27.12",
+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.12.tgz",
+      "integrity": "sha512-hhyNJ+nbR6ZR7pToHvllEFun9TL0sbL+tk/ON75lo+Xas054uez98qRbsuNt7MBCyZKK4+8Yli/OAGZhmfBZ/g==",
       "dev": true,
       "license": "MIT"
     },
@@ -1192,9 +1161,9 @@
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     },
     "node_modules/@jest/fake-timers/node_modules/@sinclair/typebox": {
-      "version": "0.27.10",
-      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.10.tgz",
-      "integrity": "sha512-MTBk/3jGLNB2tVxv6uLlFh1iu64iYOQ2PbdOSK3NW8JZsmlaOh2q6sdtKowBhfw8QFLmYNzTW4/oK4uATIi6ZA==",
+      "version": "0.27.12",
+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.12.tgz",
+      "integrity": "sha512-hhyNJ+nbR6ZR7pToHvllEFun9TL0sbL+tk/ON75lo+Xas054uez98qRbsuNt7MBCyZKK4+8Yli/OAGZhmfBZ/g==",
       "dev": true,
       "license": "MIT"
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@@ -1246,9 +1215,9 @@
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     "node_modules/@jest/globals/node_modules/@sinclair/typebox": {
-      "version": "0.27.10",
-      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.10.tgz",
-      "integrity": "sha512-MTBk/3jGLNB2tVxv6uLlFh1iu64iYOQ2PbdOSK3NW8JZsmlaOh2q6sdtKowBhfw8QFLmYNzTW4/oK4uATIi6ZA==",
+      "version": "0.27.12",
+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.12.tgz",
+      "integrity": "sha512-hhyNJ+nbR6ZR7pToHvllEFun9TL0sbL+tk/ON75lo+Xas054uez98qRbsuNt7MBCyZKK4+8Yli/OAGZhmfBZ/g==",
       "dev": true,
       "license": "MIT"
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@@ -1342,9 +1311,9 @@
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     "node_modules/@jest/reporters/node_modules/@sinclair/typebox": {
-      "version": "0.27.10",
-      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.10.tgz",
-      "integrity": "sha512-MTBk/3jGLNB2tVxv6uLlFh1iu64iYOQ2PbdOSK3NW8JZsmlaOh2q6sdtKowBhfw8QFLmYNzTW4/oK4uATIi6ZA==",
+      "version": "0.27.12",
+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.12.tgz",
+      "integrity": "sha512-hhyNJ+nbR6ZR7pToHvllEFun9TL0sbL+tk/ON75lo+Xas054uez98qRbsuNt7MBCyZKK4+8Yli/OAGZhmfBZ/g==",
       "dev": true,
       "license": "MIT"
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@@ -1424,9 +1393,9 @@
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     "node_modules/@jest/test-result/node_modules/@sinclair/typebox": {
-      "version": "0.27.10",
-      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.10.tgz",
-      "integrity": "sha512-MTBk/3jGLNB2tVxv6uLlFh1iu64iYOQ2PbdOSK3NW8JZsmlaOh2q6sdtKowBhfw8QFLmYNzTW4/oK4uATIi6ZA==",
+      "version": "0.27.12",
+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.12.tgz",
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@@ -1505,48 +1474,9 @@
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-      "license": "MIT",
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-      "license": "MIT",
-      "dependencies": {
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@@ -1721,9 +1651,9 @@
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+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.34.52.tgz",
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       "dev": true,
       "license": "MIT"
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@@ -1809,9 +1739,9 @@
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-      "resolved": "https://registry.npmjs.org/@swc/core/-/core-1.15.43.tgz",
-      "integrity": "sha512-1CuKjFkPxIgGdeHVuNbkxmBxkcbdc08u0aiI43pFq6yY1tTVKmXT9hFEooyyKs/sJ3xf1GPHyEwTtk9Xl8dvQw==",
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+      "resolved": "https://registry.npmjs.org/@swc/core/-/core-1.15.46.tgz",
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       "dev": true,
       "hasInstallScript": true,
       "license": "Apache-2.0",
@@ -1827,18 +1757,18 @@
         "url": "https://opencollective.com/swc"
       },
       "optionalDependencies": {
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-        "@swc/core-darwin-x64": "1.15.43",
-        "@swc/core-linux-arm-gnueabihf": "1.15.43",
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-        "@swc/core-linux-arm64-musl": "1.15.43",
-        "@swc/core-linux-ppc64-gnu": "1.15.43",
-        "@swc/core-linux-s390x-gnu": "1.15.43",
-        "@swc/core-linux-x64-gnu": "1.15.43",
-        "@swc/core-linux-x64-musl": "1.15.43",
-        "@swc/core-win32-arm64-msvc": "1.15.43",
-        "@swc/core-win32-ia32-msvc": "1.15.43",
-        "@swc/core-win32-x64-msvc": "1.15.43"
+        "@swc/core-darwin-arm64": "1.15.46",
+        "@swc/core-darwin-x64": "1.15.46",
+        "@swc/core-linux-arm-gnueabihf": "1.15.46",
+        "@swc/core-linux-arm64-gnu": "1.15.46",
+        "@swc/core-linux-arm64-musl": "1.15.46",
+        "@swc/core-linux-ppc64-gnu": "1.15.46",
+        "@swc/core-linux-s390x-gnu": "1.15.46",
+        "@swc/core-linux-x64-gnu": "1.15.46",
+        "@swc/core-linux-x64-musl": "1.15.46",
+        "@swc/core-win32-arm64-msvc": "1.15.46",
+        "@swc/core-win32-ia32-msvc": "1.15.46",
+        "@swc/core-win32-x64-msvc": "1.15.46"
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       "peerDependencies": {
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@@ -1850,9 +1780,9 @@
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@@ -1867,9 +1797,9 @@
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@@ -1884,9 +1814,9 @@
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     "node_modules/node-abi": {
-      "version": "3.92.0",
-      "resolved": "https://registry.npmjs.org/node-abi/-/node-abi-3.92.0.tgz",
-      "integrity": "sha512-KdHvFWZjEKDf0cakgFjebl371GPsISX2oZHcuyKqM7DtogIsHrqKeLTo8wBHxaXRAQlY2PsPlZmfo+9ZCxEREQ==",
+      "version": "3.94.0",
+      "resolved": "https://registry.npmjs.org/node-abi/-/node-abi-3.94.0.tgz",
+      "integrity": "sha512-W5ZNO5KRPB5TkYmGVD9F6YqhsglXJzE6etpbmT+f6EQElhiX/UTG551cnsRGvLG3fyZEg9HwaDmNmj5nwJ4z9g==",
       "license": "MIT",
       "dependencies": {
         "semver": "^7.3.5"
@@ -7125,12 +6902,9 @@
       "license": "MIT"
     },
     "node_modules/node-releases": {
-      "version": "2.0.49",
-      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.49.tgz",
-      "integrity": "sha512-f06bl1D+8ZDkn2oOQQKAh5/otFWqVnM1Q5oerA8Pex7UfT66Tx4IPHIqVVFKqFT3FUtaDstdgkM7yT7JWhqxfw==",
-      "version": "2.0.50",
-      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.50.tgz",
-      "integrity": "sha512-J6l92tKHX6w8Jy5nO1Vuc01NoIiRGi/d6qBKVxh+IQ8Cr3b6HbVNfKiF8ZpFKufTwpwxMmce2W3iQZ861ZRyTg==",
+      "version": "2.0.51",
+      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.51.tgz",
+      "integrity": "sha512-wRNIrw4DmVLKQlbgOMdkMx27Wrpzes2hh5Jtbi2bjPd+4wJstWIqP5A+lscnqbm0xxmT5Bpg8Lec5ItEBwx6BQ==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -7556,9 +7330,9 @@
       }
     },
     "node_modules/pretty-format/node_modules/@sinclair/typebox": {
-      "version": "0.27.10",
-      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.10.tgz",
-      "integrity": "sha512-MTBk/3jGLNB2tVxv6uLlFh1iu64iYOQ2PbdOSK3NW8JZsmlaOh2q6sdtKowBhfw8QFLmYNzTW4/oK4uATIi6ZA==",
+      "version": "0.27.12",
+      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.27.12.tgz",
+      "integrity": "sha512-hhyNJ+nbR6ZR7pToHvllEFun9TL0sbL+tk/ON75lo+Xas054uez98qRbsuNt7MBCyZKK4+8Yli/OAGZhmfBZ/g==",
       "dev": true,
       "license": "MIT"
     },
@@ -7639,16 +7413,6 @@
         "node": ">=6"
       }
     },
-    "node_modules/pump": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.4.tgz",
-      "integrity": "sha512-VS7sjc6KR7e1ukRFhQSY5LM2uBWAUPiOPa/A3mkKmiMwSmRFUITt0xuj+/lesgnCv+dPIEYlkzrcyXgquIHMcA==",
-      "license": "MIT",
-      "dependencies": {
-        "end-of-stream": "^1.1.0",
-        "once": "^1.3.1"
-      }
-    },
     "node_modules/pure-rand": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/pure-rand/-/pure-rand-6.1.0.tgz",
@@ -8393,9 +8157,9 @@
       }
     },
     "node_modules/test-exclude/node_modules/brace-expansion": {
-      "version": "1.1.15",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.15.tgz",
-      "integrity": "sha512-EwOCDEex4quD37XhqM3omwtMoJjr//isUZz1JopUNWms+4Z2ViyM/k1YIRePpoVNnQhENnxtFjLaxNHrT7xIUg==",
+      "version": "1.1.16",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.16.tgz",
+      "integrity": "sha512-IDw48K2/2kRkg9LdJxurvq3lV3aBgq0REY89duEqFRthjlPdXHKMj7EnQOXVckxzgisinf3nHfrcE2FufFLXMw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -8492,9 +8256,9 @@
       }
     },
     "node_modules/ts-jest": {
-      "version": "29.4.11",
-      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-29.4.11.tgz",
-      "integrity": "sha512-IrFl7l9AuB/qrNw5quqvAv/hmKMb8dhWOH4jQOGo0Oq8tCeo1O86/iTFG1FaRimgUkF13l4PcepO8ATFT6Ns4g==",
+      "version": "29.4.12",
+      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-29.4.12.tgz",
+      "integrity": "sha512-Ov6ClY53Fflh6BGAnY2DlTq1hYDrTycz2PVTXBWFW2CU+9zrEqAp9fWdGXl42EXO5RLSFAcAZ2JFKbP+zBTFfw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -8504,7 +8268,7 @@
         "json5": "^2.2.3",
         "lodash.memoize": "^4.1.2",
         "make-error": "^1.3.6",
-        "semver": "^7.8.0",
+        "semver": "^7.8.5",
         "type-fest": "^4.41.0",
         "yargs-parser": "^21.1.1"
       },
diff --git a/listener/package.json b/listener/package.json
index 1de3a88..498caf2 100644
--- a/listener/package.json
+++ b/listener/package.json
@@ -10,10 +10,7 @@
     "lint": "node ./node_modules/typescript/bin/tsc --noEmit",
     "test": "node ./node_modules/jest/bin/jest.js",
     "migrate": "ts-node src/scripts/migrate-db.ts",
-    "migrate:templates": "ts-node src/scripts/migrate-templates.ts"
-    "typecheck": "node ./node_modules/typescript/bin/tsc --noEmit",
-    "lint": "node ./node_modules/typescript/bin/tsc --noEmit",
-    "migrate": "ts-node src/scripts/migrate-db.ts",
+    "migrate:templates": "ts-node src/scripts/migrate-templates.ts",
     "check-migrations": "ts-node src/scripts/check-migrations.ts",
     "validate:batch": "ts-node src/utils/batch-validator.ts"
   },
diff --git a/listener/src/config.test.ts b/listener/src/config.test.ts
index aaf3670..b1cb96a 100644
--- a/listener/src/config.test.ts
+++ b/listener/src/config.test.ts
@@ -107,6 +107,83 @@ describe('Config validation', () => {
     });
   });
 
+  describe('EXPIRATION_CONFIG', () => {
+    it('loads default expiration settings when not specified', () => {
+      delete process.env.EXPIRATION_ENABLED;
+      delete process.env.EXPIRATION_DEFAULT_MS;
+      delete process.env.EXPIRATION_PER_EVENT_TYPE;
+
+      const config = loadConfig();
+
+      expect(config.expiration).toMatchObject({
+        enabled: true,
+        defaultExpirationMs: 86400000, // 24 hours
+        perEventTypeExpiration: undefined,
+      });
+    });
+
+    it('loads custom default expiration time', () => {
+      process.env.EXPIRATION_DEFAULT_MS = '3600000'; // 1 hour
+      delete process.env.EXPIRATION_PER_EVENT_TYPE;
+
+      const config = loadConfig();
+
+      expect(config.expiration).toMatchObject({
+        enabled: true,
+        defaultExpirationMs: 3600000,
+      });
+    });
+
+    it('loads per-event-type expiration settings', () => {
+      process.env.EXPIRATION_PER_EVENT_TYPE = JSON.stringify({
+        notification_scheduled: 3600000,
+        alert: 604800000,
+      });
+
+      const config = loadConfig();
+
+      expect(config.expiration?.perEventTypeExpiration).toEqual({
+        notification_scheduled: 3600000,
+        alert: 604800000,
+      });
+    });
+
+    it('disables expiration when EXPIRATION_ENABLED is false', () => {
+      process.env.EXPIRATION_ENABLED = 'false';
+
+      const config = loadConfig();
+
+      expect(config.expiration?.enabled).toBe(false);
+    });
+
+    it('throws ConfigError for invalid EXPIRATION_DEFAULT_MS', () => {
+      process.env.EXPIRATION_DEFAULT_MS = 'not-a-number';
+
+      expect(() => loadConfig()).toThrow(ConfigError);
+      expect(() => loadConfig()).toThrow(
+        'EXPIRATION_DEFAULT_MS must be a valid integer, got "not-a-number"'
+      );
+    });
+
+    it('throws ConfigError for invalid EXPIRATION_PER_EVENT_TYPE JSON', () => {
+      process.env.EXPIRATION_PER_EVENT_TYPE = 'not-json';
+
+      expect(() => loadConfig()).toThrow(ConfigError);
+      expect(() => loadConfig()).toThrow(
+        'EXPIRATION_PER_EVENT_TYPE must be valid JSON. Received: not-json'
+      );
+    });
+
+    it('throws ConfigError when EXPIRATION_PER_EVENT_TYPE is not an object', () => {
+      process.env.EXPIRATION_PER_EVENT_TYPE = '["array", "value"]';
+
+      expect(() => loadConfig()).toThrow(ConfigError);
+      expect(() => loadConfig()).toThrow(
+        'EXPIRATION_PER_EVENT_TYPE must be a valid JSON object'
+      );
+    });
+  });
+
   describe('WEBHOOK_SECRETS', () => {
     it('defaults to an empty array when not set', () => {
       delete process.env.WEBHOOK_SECRETS;
diff --git a/listener/src/config.ts b/listener/src/config.ts
index fe5c962..e126539 100644
--- a/listener/src/config.ts
+++ b/listener/src/config.ts
@@ -1,5 +1,4 @@
-import { Config, ContractConfig, DiscordConfig, WebhookSecret, AppCleanupConfig, EventQueueConfig, RetrySchedulerOptions } from './types';
-import { Config, ContractConfig, DiscordConfig, WebhookSecret, AppCleanupConfig, EventQueueConfig, RetrySchedulerOptions, AnalyticsConfig } from './types';
+import { Config, ContractConfig, DiscordConfig, WebhookSecret, AppCleanupConfig, EventQueueConfig, RetrySchedulerOptions, AnalyticsConfig, ExpirationConfig, ApiKey } from './types';
 
 export class ConfigError extends Error {
   constructor(message: string) {
@@ -174,6 +173,29 @@ function loadRetrySchedulerConfig(): RetrySchedulerOptions {
   };
 }
 
+function loadExpirationConfig(): ExpirationConfig {
+  const defaultExpirationMs = parseIntegerEnv('EXPIRATION_DEFAULT_MS', String(24 * 60 * 60 * 1000));
+  const perEventTypeExpirationJson = trimEnv('EXPIRATION_PER_EVENT_TYPE');
+  let perEventTypeExpiration: Record<string, number> | undefined;
+  
+  if (perEventTypeExpirationJson) {
+    try {
+      perEventTypeExpiration = JSON.parse(perEventTypeExpirationJson);
+      if (typeof perEventTypeExpiration !== 'object' || perEventTypeExpiration === null) {
+        throw new ConfigError('EXPIRATION_PER_EVENT_TYPE must be a valid JSON object');
+      }
+    } catch (e) {
+      throw new ConfigError(`EXPIRATION_PER_EVENT_TYPE must be valid JSON. Received: ${perEventTypeExpirationJson}`);
+    }
+  }
+  
+  return {
+    defaultExpirationMs,
+    perEventTypeExpiration,
+    enabled: trimEnv('EXPIRATION_ENABLED') !== 'false',
+  };
+}
+
 export function loadConfig(): Config {
   const discord = loadDiscordConfig();
   const rawContractAddresses = parseJsonEnv<unknown>('CONTRACT_ADDRESSES', '[]');
@@ -228,6 +250,7 @@ export function loadConfig(): Config {
     },
     cleanup: loadCleanupConfig(),
     analytics: loadAnalyticsConfig(),
+    expiration: loadExpirationConfig(),
   };
 }
 
diff --git a/listener/src/services/event-subscriber.test.ts b/listener/src/services/event-subscriber.test.ts
index 0e0cc99..8ec0559 100644
--- a/listener/src/services/event-subscriber.test.ts
+++ b/listener/src/services/event-subscriber.test.ts
@@ -635,3 +635,265 @@ describe('EventSubscriber', () => {
     });
   });
 });
+
+  describe('notification expiration (Task 3: Requirements 2.1, 2.2, 2.3)', () => {
+    const DEFAULT_EXPIRATION_MS = 24 * 60 * 60 * 1000; // 24 hours
+    const NOW = Date.now();
+
+    it('skips expired events when expiration service is configured', async () => {
+      const expiredTime = NOW - (DEFAULT_EXPIRATION_MS + 1000); // 1 second past expiration
+      const expiredEvent = createMockEvent({
+        id: 'expired-event',
+        receivedAt: expiredTime,
+      });
+
+      mockGetEvents.mockResolvedValue({
+        events: [expiredEvent],
+        cursor: 'cursor-expired',
+      });
+
+      const configWithExpiration: Config = {
+        ...testConfig,
+        expiration: {
+          defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+          enabled: true,
+        },
+      };
+
+      const subscriber = new EventSubscriber(configWithExpiration);
+      await (subscriber as any).checkForEvents();
+
+      // Event should be skipped due to expiration
+      expect(countLogCalls('info', 'Processing event')).toBe(0);
+      expect(mockLogger.warn).toHaveBeenCalledWith(
+        'Skipping expired notification',
+        expect.objectContaining({
+          eventId: 'expired-event',
+          reason: 'expired',
+        })
+      );
+    });
+
+    it('processes valid (non-expired) events when expiration service is configured', async () => {
+      const recentEvent = createMockEvent({
+        id: 'recent-event',
+        receivedAt: NOW,
+      });
+
+      mockGetEvents.mockResolvedValue({
+        events: [recentEvent],
+        cursor: 'cursor-recent',
+      });
+
+      const configWithExpiration: Config = {
+        ...testConfig,
+        expiration: {
+          defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+          enabled: true,
+        },
+      };
+
+      const subscriber = new EventSubscriber(configWithExpiration);
+      await (subscriber as any).checkForEvents();
+
+      // Event should be processed
+      expect(countLogCalls('info', 'Processing event')).toBe(1);
+    });
+
+    it('logs expiration with timestamp details', async () => {
+      const expiredTime = NOW - (DEFAULT_EXPIRATION_MS + 1000);
+      const expiredEvent = createMockEvent({
+        id: 'expired-details',
+        receivedAt: expiredTime,
+      });
+
+      mockGetEvents.mockResolvedValue({
+        events: [expiredEvent],
+        cursor: 'cursor-expired-details',
+      });
+
+      const configWithExpiration: Config = {
+        ...testConfig,
+        expiration: {
+          defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+          enabled: true,
+        },
+      };
+
+      const subscriber = new EventSubscriber(configWithExpiration);
+      await (subscriber as any).checkForEvents();
+
+      expect(mockLogger.warn).toHaveBeenCalledWith(
+        'Skipping expired notification',
+        expect.objectContaining({
+          contractAddress: contractConfig.address,
+          eventId: 'expired-details',
+          eventName: 'TaskCreated',
+          receivedAt: expiredTime,
+          currentTime: expect.any(Number),
+          reason: 'expired',
+        })
+      );
+    });
+
+    it('processes events when expiration is disabled', async () => {
+      const veryOldTime = NOW - (365 * 24 * 60 * 60 * 1000); // 1 year ago
+      const oldEvent = createMockEvent({
+        id: 'very-old-event',
+        receivedAt: veryOldTime,
+      });
+
+      mockGetEvents.mockResolvedValue({
+        events: [oldEvent],
+        cursor: 'cursor-old',
+      });
+
+      const configWithDisabledExpiration: Config = {
+        ...testConfig,
+        expiration: {
+          defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+          enabled: false,
+        },
+      };
+
+      const subscriber = new EventSubscriber(configWithDisabledExpiration);
+      await (subscriber as any).checkForEvents();
+
+      // Event should be processed even though it's very old
+      expect(countLogCalls('info', 'Processing event')).toBe(1);
+    });
+
+    it('processes all events when no expiration config is provided', async () => {
+      const oldEvent = createMockEvent({
+        id: 'no-expiration-config',
+        receivedAt: NOW - (365 * 24 * 60 * 60 * 1000),
+      });
+
+      mockGetEvents.mockResolvedValue({
+        events: [oldEvent],
+        cursor: 'cursor-no-expiration',
+      });
+
+      // Config without expiration settings
+      const configWithoutExpiration: Config = {
+        ...testConfig,
+      };
+
+      const subscriber = new EventSubscriber(configWithoutExpiration);
+      await (subscriber as any).checkForEvents();
+
+      // Event should be processed - no expiration service initialized
+      expect(countLogCalls('info', 'Processing event')).toBe(1);
+    });
+
+    it('handles mixed batch with both expired and valid events', async () => {
+      const expiredEvent = createMockEvent({
+        id: 'expired-in-batch',
+        receivedAt: NOW - (DEFAULT_EXPIRATION_MS + 1000),
+      });
+      const validEvent = createMockEvent({
+        id: 'valid-in-batch',
+        receivedAt: NOW,
+      });
+
+      mockGetEvents.mockResolvedValue({
+        events: [expiredEvent, validEvent],
+        cursor: 'cursor-mixed-batch',
+      });
+
+      const configWithExpiration: Config = {
+        ...testConfig,
+        expiration: {
+          defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+          enabled: true,
+        },
+      };
+
+      const subscriber = new EventSubscriber(configWithExpiration);
+      await (subscriber as any).checkForEvents();
+
+      // Only the valid event should be processed
+      expect(countLogCalls('info', 'Processing event')).toBe(1);
+      expect(mockLogger.warn).toHaveBeenCalledWith(
+        'Skipping expired notification',
+        expect.objectContaining({
+          eventId: 'expired-in-batch',
+          reason: 'expired',
+        })
+      );
+    });
+
+    it('respects per-event-type expiration settings', async () => {
+      const fastEventExpiredTime = NOW - (5 * 60 * 1000 + 1000); // 5 minutes + 1 second
+      const slowEventExpiredTime = NOW - (7 * 24 * 60 * 60 * 1000 + 1000); // 7 days + 1 second
+
+      const fastEvent = createMockEvent({
+        id: 'fast-expired',
+        receivedAt: fastEventExpiredTime,
+      });
+      const slowEvent = createMockEvent({
+        id: 'slow-expired',
+        receivedAt: slowEventExpiredTime,
+      });
+
+      // First call returns fast event, second returns slow event
+      mockGetEvents
+        .mockResolvedValueOnce({
+          events: [fastEvent],
+          cursor: 'cursor-fast',
+        })
+        .mockResolvedValueOnce({
+          events: [slowEvent],
+          cursor: 'cursor-slow',
+        });
+
+      const configWithPerTypeExpiration: Config = {
+        ...testConfig,
+        expiration: {
+          defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+          perEventTypeExpiration: {
+            TaskCreated: 5 * 60 * 1000, // 5 minutes for TaskCreated
+          },
+          enabled: true,
+        },
+      };
+
+      const subscriber = new EventSubscriber(configWithPerTypeExpiration);
+      
+      // First check - fast event should be expired
+      await (subscriber as any).checkForEvents();
+      expect(countLogCalls('info', 'Processing event')).toBe(0);
+      expect(mockLogger.warn).toHaveBeenCalledWith(
+        'Skipping expired notification',
+        expect.objectContaining({
+          eventId: 'fast-expired',
+          reason: 'expired',
+        })
+      );
+
+      // Reset mock counters
+      jest.clearAllMocks();
+
+      // Second check - slow event should NOT be expired (uses default 24h)
+      await (subscriber as any).checkForEvents();
+      expect(countLogCalls('info', 'Processing event')).toBe(1);
+    });
+
+    it('initializes expirationService only when config.expiration is provided', () => {
+      const configWithExpiration: Config = {
+        ...testConfig,
+        expiration: {
+          defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+          enabled: true,
+        },
+      };
+      const subscriber1 = new EventSubscriber(configWithExpiration);
+      expect((subscriber1 as any).expirationService).toBeDefined();
+      expect((subscriber1 as any).expirationService).not.toBeNull();
+
+      const configWithoutExpiration: Config = { ...testConfig };
+      const subscriber2 = new EventSubscriber(configWithoutExpiration);
+      expect((subscriber2 as any).expirationService).toBeNull();
+    });
+  });
+});
diff --git a/listener/src/services/event-subscriber.ts b/listener/src/services/event-subscriber.ts
index c4d98d9..8c3d9f2 100644
--- a/listener/src/services/event-subscriber.ts
+++ b/listener/src/services/event-subscriber.ts
@@ -13,6 +13,7 @@ import { DiscordNotificationService } from './discord-notification';
 import { NotificationRetryQueue } from './notification-retry-queue';
 import { EventDeduplicationService } from './event-deduplication-service';
 import { EventProcessingQueue } from './event-processing-queue';
+import { NotificationExpirationService } from './notification-expiration';
 
 export class EventSubscriber {
   private config: Config;
@@ -24,11 +25,18 @@ export class EventSubscriber {
   private retryQueue: NotificationRetryQueue | null = null;
   private deduplicationService: EventDeduplicationService | null = null;
   private eventQueue: EventProcessingQueue | null = null;
+  private expirationService: NotificationExpirationService | null = null;
 
   constructor(config: Config, deduplicationService?: EventDeduplicationService) {
     this.config = config;
     this.server = new StellarSDK.rpc.Server(config.stellarRpcUrl);
     this.deduplicationService = deduplicationService ?? null;
+    
+    // Initialize expiration service if configured
+    if (config.expiration) {
+      this.expirationService = new NotificationExpirationService(config.expiration);
+    }
+    
     if (config.discord) {
       this.discordService = new DiscordNotificationService(config.discord);
       this.retryQueue = new NotificationRetryQueue(
@@ -175,6 +183,21 @@ export class EventSubscriber {
     contractConfig: ContractConfig,
     requestId: string = ''
   ): boolean {
+    // Check if event has expired
+    if (this.expirationService && !this.expirationService.shouldProcess(event)) {
+      const eventName = getEventName(event.topic);
+      logger.warn('Skipping expired notification', {
+        requestId,
+        contractAddress: contractConfig.address,
+        eventId: event.id,
+        eventName,
+        receivedAt: event.receivedAt,
+        currentTime: Date.now(),
+        reason: 'expired',
+      });
+      return false;
+    }
+
     const validation = validateEventPayload(event);
     if (!validation.valid) {
       logger.warn('Skipping invalid event payload', {
diff --git a/listener/src/services/notification-expiration.test.ts b/listener/src/services/notification-expiration.test.ts
new file mode 100644
index 0000000..9a7a219
--- /dev/null
+++ b/listener/src/services/notification-expiration.test.ts
@@ -0,0 +1,569 @@
+import * as StellarSDK from '@stellar/stellar-sdk';
+import { NotificationExpirationService } from './notification-expiration';
+import { ExpirationConfig } from '../types';
+import logger from '../utils/logger';
+
+jest.mock('../utils/logger', () => ({
+  __esModule: true,
+  default: {
+    warn: jest.fn(),
+    info: jest.fn(),
+    error: jest.fn(),
+  },
+}));
+
+const mockLogger = logger as jest.Mocked<typeof logger>;
+
+describe('NotificationExpirationService', () => {
+  const DEFAULT_EXPIRATION_MS = 24 * 60 * 60 * 1000; // 24 hours
+  const NOW = Date.now();
+
+  let service: NotificationExpirationService;
+  let config: ExpirationConfig;
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    config = {
+      defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+      enabled: true,
+    };
+    service = new NotificationExpirationService(config);
+  });
+
+  describe('isExpired()', () => {
+    it('should return false for recently received events', () => {
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-1',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: NOW,
+      };
+
+      const result = service.isExpired(event);
+      expect(result).toBe(false);
+    });
+
+    it('should return true for expired events', () => {
+      const expiredTime = NOW - (DEFAULT_EXPIRATION_MS + 1000); // 1 second past expiration
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-expired',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: expiredTime,
+      };
+
+      const result = service.isExpired(event);
+      expect(result).toBe(true);
+    });
+
+    it('should return false for events at exact expiration boundary', () => {
+      const boundaryTime = NOW - DEFAULT_EXPIRATION_MS;
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-boundary',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: boundaryTime,
+      };
+
+      const result = service.isExpired(event);
+      // At exact boundary, should not be expired (> not >=)
+      expect(result).toBe(false);
+    });
+
+    it('should return false when expiration is disabled', () => {
+      const disabledConfig: ExpirationConfig = {
+        defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+        enabled: false,
+      };
+      const disabledService = new NotificationExpirationService(disabledConfig);
+
+      const expiredTime = NOW - (DEFAULT_EXPIRATION_MS + 1000);
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-old',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: expiredTime,
+      };
+
+      const result = disabledService.isExpired(event);
+      expect(result).toBe(false);
+    });
+  });
+
+  describe('shouldProcess()', () => {
+    it('should return true for valid (non-expired) events', () => {
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-valid',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: NOW,
+      };
+
+      const result = service.shouldProcess(event);
+      expect(result).toBe(true);
+      expect(mockLogger.warn).not.toHaveBeenCalled();
+    });
+
+    it('should return false for expired events', () => {
+      const expiredTime = NOW - (DEFAULT_EXPIRATION_MS + 1000);
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-old',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: expiredTime,
+      };
+
+      const result = service.shouldProcess(event);
+      expect(result).toBe(false);
+      expect(mockLogger.warn).toHaveBeenCalledWith(
+        'Event skipped due to expiration',
+        expect.objectContaining({
+          eventId: 'event-old',
+        })
+      );
+    });
+
+    it('should return true when expiration is disabled', () => {
+      const disabledConfig: ExpirationConfig = {
+        defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+        enabled: false,
+      };
+      const disabledService = new NotificationExpirationService(disabledConfig);
+
+      const expiredTime = NOW - (DEFAULT_EXPIRATION_MS + 1000);
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-old',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: expiredTime,
+      };
+
+      const result = disabledService.shouldProcess(event);
+      expect(result).toBe(true);
+    });
+
+    it('should include eventType in log when provided', () => {
+      const expiredTime = NOW - (DEFAULT_EXPIRATION_MS + 1000);
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-typed',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: expiredTime,
+      };
+
+      service.shouldProcess(event, 'notification_scheduled');
+      expect(mockLogger.warn).toHaveBeenCalledWith(
+        'Event skipped due to expiration',
+        expect.objectContaining({
+          eventType: 'notification_scheduled',
+        })
+      );
+    });
+  });
+
+  describe('getExpirationTime()', () => {
+    it('should return default expiration time when no event type provided', () => {
+      const result = service.getExpirationTime();
+      expect(result).toBe(DEFAULT_EXPIRATION_MS);
+    });
+
+    it('should return default expiration when event type has no override', () => {
+      const result = service.getExpirationTime('unknown_event');
+      expect(result).toBe(DEFAULT_EXPIRATION_MS);
+    });
+
+    it('should return per-event-type expiration when available', () => {
+      const perEventConfig: ExpirationConfig = {
+        defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+        perEventTypeExpiration: {
+          'notification_scheduled': 60 * 60 * 1000, // 1 hour
+          'notification_revoked': 5 * 60 * 1000, // 5 minutes
+        },
+        enabled: true,
+      };
+      const serviceWithPerType = new NotificationExpirationService(perEventConfig);
+
+      expect(serviceWithPerType.getExpirationTime('notification_scheduled')).toBe(
+        60 * 60 * 1000
+      );
+      expect(serviceWithPerType.getExpirationTime('notification_revoked')).toBe(
+        5 * 60 * 1000
+      );
+    });
+
+    it('should fall back to default when event type not in per-type map', () => {
+      const perEventConfig: ExpirationConfig = {
+        defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+        perEventTypeExpiration: {
+          'notification_scheduled': 60 * 60 * 1000,
+        },
+        enabled: true,
+      };
+      const serviceWithPerType = new NotificationExpirationService(perEventConfig);
+
+      const result = serviceWithPerType.getExpirationTime('unknown_type');
+      expect(result).toBe(DEFAULT_EXPIRATION_MS);
+    });
+
+    it('should handle empty per-event-type map', () => {
+      const perEventConfig: ExpirationConfig = {
+        defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+        perEventTypeExpiration: {},
+        enabled: true,
+      };
+      const serviceWithPerType = new NotificationExpirationService(perEventConfig);
+
+      const result = serviceWithPerType.getExpirationTime('any_type');
+      expect(result).toBe(DEFAULT_EXPIRATION_MS);
+    });
+
+    it('should handle undefined per-event-type map', () => {
+      const perEventConfig: ExpirationConfig = {
+        defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+        enabled: true,
+      };
+      const serviceWithPerType = new NotificationExpirationService(perEventConfig);
+
+      const result = serviceWithPerType.getExpirationTime('any_type');
+      expect(result).toBe(DEFAULT_EXPIRATION_MS);
+    });
+  });
+
+  describe('Configuration management', () => {
+    it('should get current config', () => {
+      const result = service.getConfig();
+      expect(result).toEqual(config);
+      expect(result.defaultExpirationMs).toBe(DEFAULT_EXPIRATION_MS);
+      expect(result.enabled).toBe(true);
+    });
+
+    it('should update config at runtime', () => {
+      const newConfig: ExpirationConfig = {
+        defaultExpirationMs: 60 * 60 * 1000, // 1 hour
+        enabled: false,
+      };
+
+      service.setConfig(newConfig);
+      const result = service.getConfig();
+      expect(result).toEqual(newConfig);
+      expect(result.defaultExpirationMs).toBe(60 * 60 * 1000);
+      expect(result.enabled).toBe(false);
+    });
+
+    it('should apply new config to expiration checks', () => {
+      const expiredTime = NOW - (DEFAULT_EXPIRATION_MS + 1000);
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-reconfig',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: expiredTime,
+      };
+
+      // Should be expired with initial config
+      expect(service.shouldProcess(event)).toBe(false);
+
+      // Disable expiration
+      service.setConfig({
+        defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+        enabled: false,
+      });
+
+      // Should now process
+      expect(service.shouldProcess(event)).toBe(true);
+    });
+  });
+
+  describe('edge cases', () => {
+    it('should handle very long expiration times', () => {
+      const veryLongConfig: ExpirationConfig = {
+        defaultExpirationMs: 365 * 24 * 60 * 60 * 1000, // 1 year
+        enabled: true,
+      };
+      const longService = new NotificationExpirationService(veryLongConfig);
+
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-long',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: NOW - (24 * 60 * 60 * 1000), // 1 day old
+      };
+
+      const result = longService.shouldProcess(event);
+      expect(result).toBe(true);
+    });
+
+    it('should handle very short expiration times', () => {
+      const shortConfig: ExpirationConfig = {
+        defaultExpirationMs: 1000, // 1 second
+        enabled: true,
+      };
+      const shortService = new NotificationExpirationService(shortConfig);
+
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-short',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: NOW - 2000, // 2 seconds old
+      };
+
+      const result = shortService.shouldProcess(event);
+      expect(result).toBe(false);
+    });
+
+    it('should handle zero expiration time (instant expiration)', () => {
+      const zeroConfig: ExpirationConfig = {
+        defaultExpirationMs: 0,
+        enabled: true,
+      };
+      const zeroService = new NotificationExpirationService(zeroConfig);
+
+      const recentEvent: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-zero',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: NOW,
+      };
+
+      // Even recent events should be expired with zero expiration
+      const result = zeroService.shouldProcess(recentEvent);
+      expect(result).toBe(false);
+    });
+  });
+
+  describe('default expiration behavior (Requirement 2.1)', () => {
+    it('should use default 24-hour expiration when no per-type config', () => {
+      const defaultConfig: ExpirationConfig = {
+        defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+        enabled: true,
+      };
+      const defaultService = new NotificationExpirationService(defaultConfig);
+
+      const expiredTime = NOW - (DEFAULT_EXPIRATION_MS + 1000);
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'event-default',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: expiredTime,
+      };
+
+      expect(defaultService.shouldProcess(event)).toBe(false);
+    });
+  });
+
+  describe('per-event-type expiration (Requirement 2.3)', () => {
+    it('should apply per-event-type expiration correctly', () => {
+      const perTypeConfig: ExpirationConfig = {
+        defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+        perEventTypeExpiration: {
+          'fast_event': 5 * 60 * 1000, // 5 minutes
+          'slow_event': 7 * 24 * 60 * 60 * 1000, // 7 days
+        },
+        enabled: true,
+      };
+      const perTypeService = new NotificationExpirationService(perTypeConfig);
+
+      const eventTime = NOW - (10 * 60 * 1000); // 10 minutes ago
+
+      // Fast event should be expired (only 5 min TTL)
+      const fastEvent: StellarSDK.rpc.Api.EventResponse = {
+        id: 'fast-event',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: eventTime,
+      };
+
+      // Slow event should not be expired (7 day TTL)
+      const slowEvent: StellarSDK.rpc.Api.EventResponse = {
+        id: 'slow-event',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: eventTime,
+      };
+
+      expect(perTypeService.shouldProcess(fastEvent, 'fast_event')).toBe(false);
+      expect(perTypeService.shouldProcess(slowEvent, 'slow_event')).toBe(true);
+    });
+  });
+
+  describe('disabling expiration (Requirement 4.2)', () => {
+    it('should allow disabling expiration via configuration', () => {
+      const disabledConfig: ExpirationConfig = {
+        defaultExpirationMs: DEFAULT_EXPIRATION_MS,
+        enabled: false,
+      };
+      const disabledService = new NotificationExpirationService(disabledConfig);
+
+      const veryOldTime = NOW - (365 * 24 * 60 * 60 * 1000); // 1 year ago
+      const event: StellarSDK.rpc.Api.EventResponse = {
+        id: 'ancient-event',
+        type: 'contract',
+        ledger: 100,
+        ledgerClosedAt: new Date().toISOString(),
+        contractId: 'test-contract',
+        contractSequenceNumber: '1',
+        txHash: 'hash',
+        txIndex: 0,
+        eventIndex: 0,
+        topic: ['topic'],
+        value: { type: 'i128', b64: 'value' },
+        inSuccessfulContractInvocation: true,
+        createdAt: new Date().toISOString(),
+        receivedAt: veryOldTime,
+      };
+
+      // Should process even though event is extremely old
+      const result = disabledService.shouldProcess(event);
+      expect(result).toBe(true);
+    });
+  });
+});
diff --git a/listener/src/services/notification-expiration.ts b/listener/src/services/notification-expiration.ts
new file mode 100644
index 0000000..e2fdc50
--- /dev/null
+++ b/listener/src/services/notification-expiration.ts
@@ -0,0 +1,116 @@
+import * as StellarSDK from '@stellar/stellar-sdk';
+import { ExpirationConfig } from '../types';
+import logger from '../utils/logger';
+
+/**
+ * NotificationExpirationService handles expiration checks for notifications.
+ * 
+ * This service:
+ * - Checks if notifications have exceeded their expiration timestamp
+ * - Supports configurable default expiration (24 hours by default)
+ * - Supports per-event-type expiration overrides
+ * - Can be disabled via configuration for backward compatibility
+ */
+export class NotificationExpirationService {
+  private config: ExpirationConfig;
+
+  constructor(config: ExpirationConfig) {
+    this.config = config;
+  }
+
+  /**
+   * Check if a notification has expired based on its receivedAt timestamp
+   * and the appropriate expiration time.
+   * 
+   * @param event - The blockchain event to check
+   * @returns true if the event has expired, false otherwise
+   */
+  isExpired(event: StellarSDK.rpc.Api.EventResponse): boolean {
+    // If expiration is disabled, nothing is ever expired
+    if (!this.config.enabled) {
+      return false;
+    }
+
+    // Get the expiration time in milliseconds for this event
+    const expirationTimeMs = this.getExpirationTime();
+    
+    // Calculate when this event should expire
+    // receivedAt is in milliseconds (Unix timestamp)
+    const expiresAtMs = event.receivedAt + expirationTimeMs;
+
+    // Check if current time exceeds the expiration time
+    const currentTimeMs = Date.now();
+    return currentTimeMs > expiresAtMs;
+  }
+
+  /**
+   * Determine if an event should be processed based on expiration status.
+   * 
+   * This is the main entry point for checking if an event is still valid.
+   * 
+   * @param event - The blockchain event to check
+   * @param eventType - Optional event type for per-type expiration lookup
+   * @returns true if the event should be processed, false if expired
+   */
+  shouldProcess(
+    event: StellarSDK.rpc.Api.EventResponse,
+    eventType?: string
+  ): boolean {
+    // If expiration is disabled, always process
+    if (!this.config.enabled) {
+      return true;
+    }
+
+    const expired = this.isExpired(event);
+    
+    if (expired) {
+      logger.warn('Event skipped due to expiration', {
+        eventId: event.id,
+        receivedAt: event.receivedAt,
+        eventType,
+        currentTime: Date.now(),
+      });
+    }
+
+    return !expired;
+  }
+
+  /**
+   * Get the expiration time in milliseconds for a given event type.
+   * 
+   * Uses per-event-type configuration if available, otherwise uses default.
+   * 
+   * @param eventType - Optional event type to look up specific expiration time
+   * @returns Expiration time in milliseconds
+   */
+  getExpirationTime(eventType?: string): number {
+    // If an event type is provided, check for per-type expiration
+    if (eventType && this.config.perEventTypeExpiration) {
+      const perTypeExpiration = this.config.perEventTypeExpiration[eventType];
+      if (perTypeExpiration !== undefined) {
+        return perTypeExpiration;
+      }
+    }
+
+    // Return default expiration
+    return this.config.defaultExpirationMs;
+  }
+
+  /**
+   * Get the current configuration.
+   * 
+   * @returns The expiration configuration
+   */
+  getConfig(): ExpirationConfig {
+    return this.config;
+  }
+
+  /**
+   * Update the configuration at runtime.
+   * 
+   * @param config - New expiration configuration
+   */
+  setConfig(config: ExpirationConfig): void {
+    this.config = config;
+  }
+}
diff --git a/listener/src/types/index.ts b/listener/src/types/index.ts
index be5eef7..5ff0c02 100644
--- a/listener/src/types/index.ts
+++ b/listener/src/types/index.ts
@@ -61,6 +61,7 @@ export interface Config {
   rateLimit?: RateLimitConfig;
   cleanup?: AppCleanupConfig;
   analytics?: AnalyticsConfig;
+  expiration?: ExpirationConfig;
 }
 
 export interface SchedulerConfig {
@@ -119,3 +120,12 @@ export interface AnalyticsConfig {
   snapshotRetentionDays: number;
 }
 
+export interface ExpirationConfig {
+  /** Default expiration time in milliseconds (default: 24 hours = 86400000). */
+  defaultExpirationMs: number;
+  /** Per-event-type expiration times in milliseconds. */
+  perEventTypeExpiration?: Record<string, number>;
+  /** Whether expiration checking is enabled (default: true). */
+  enabled: boolean;
+}
+