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	andytruong
	Jul 9 2019, 10:40 AM

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	## database structure

	### tadaa_stream

	- id < uint, autoincrease
	- title < string: Event type
	- created < int: UNIX timestamp
	- payload < blob

	### tadaa_deals

	- uuid < string: local ID of curated deal
	- title < string: Short description of
	- provider_uuid < string
	- cateory_uuid < string
	- tags < []string
	- discount < Discount
	- image < url: For deal preview.

	### tadaa_deal_categories

	- uuid < string
	- slug < string
	- title < string

	### tadaa_users

	- uuid < string: If of our system user.
	- status < smallint
	- -1: Blocked
	- 0: Unsubscribed
	- 1: Active
	- message_pid: Message user PID we can use to send message to.

	### tadaa_subscription

	- category_uuid < string
	- user_uuid < string

	## Use cases

	### User starts the journey

	```
	{
	"title": "tadaa/messeneger.start:v1",
	"created": int,
	"data": {
	"psid": int,
	"text": ?string
	}
	}
	```

	### User unsubscribes

	```
	{
	"title": "tadaa/messeneger.end:v1",
	"created": int,
	"actor": "user",
	"data": {
	"psid": int,
	"text": ?string,
	}
	}
	```

	### Failed to delivery message to user > Handle error > Auto unsubscribe if user already delete the thread.

	Commit this event to stream:

	````
	{
	"title": "tadaa/messeneger.end:v1",
	"created": int,
	"actor": "system",
	"data": {
	"psid": int
	}
	}
	```