Feature/notify creator new fan

[Skinny001]

This pull request introduces a new subscription event system with in-app and email notifications, as well as a public API for retrieving creator subscriber statistics. It also refactors the main application entry point to support these new features and adds new routes and services for handling subscription events and payouts. The most important changes are grouped below.

Subscription Event Handling and Notification System

• Added a new SubscriptionService (src/services/subscriptionService.js) to handle subscription events (subscribe, unsubscribe, expire), maintain cached subscriber counts, emit events, and trigger notifications and audit logs.
• Introduced a NotificationService (src/services/notificationService.js) to manage in-app notifications for creators, with methods to add, list, and mark notifications as read.
• Implemented an email utility (src/utils/email.js) using nodemailer for sending notification emails to creators when they gain new subscribers.

API and Routing Enhancements

• Added a new /api/subscription/events webhook endpoint (routes/subscription.js) to receive subscription events, validate secrets, and delegate processing to the SubscriptionService.
• Added a new /api/creator/:id/stats endpoint to fetch creator statistics, including the cached subscriber count.
• Added a /api/payouts endpoint to retrieve payout information for a creator.

Main Application Refactor

• Refactored index.js to initialize and inject the new services (SubscriptionService, NotificationService, email utility), expose subscriptionService on the app for use in routers, and register new routes for subscription events and payouts. [1] [2] [3]
• Removed redundant/duplicate middleware and route definitions, consolidating the app's entry point to avoid conflicts and improve maintainability.

Testing

• Added a new test suite (subscription.test.js) to verify subscription event processing and the correctness of the subscriber count API.

Dependency Management

• Added better-sqlite3 as a new dependency in package.json to support improved database operations.

close #5

[drips-wave]

@Skinny001 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits

[elizabetheonoja-art]

resolve conflicts

[Skinny001]

resolve conflicts

Done