Multi-user notification with HouseNotification model

[Yukaii]

About the new house crawling mechanism

The house store stores the most recent data. There are two types of cron jobs to perform crawling:

• Main Job: Crawl the default raw query (including all new houses) every 3 minutes.
• Subscription Jobs: Extract and create unique subscription queries for each channel, execute them independently, and then send out notifications. The frequency of execution may vary according to the user's plan.

New notification system

Notification is sent per channel. So we need new models for sending notification.

• Subscription <-- hasMany --> ChannelNotification <-- hasMany --> House

erDiagram
  Subscription ||--o{ ChannelNotification : hasMany
  House ||--o{ ChannelNotification : hasMany

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