[backend] Create a lambda cron function to send push notifications

[pfortuna]

We first need to investigate how we can implement this.

We want to send a message to all the users if they haven't submitted a "actualização de estado" for more than 24h.

This message is triggered by a recurring lambda function that runs everyday, starting at H and is sent in batches every N configurable minutes.
Example configuration:
H = 8pm
N = 10min
These parameters must be stored in .env

The endpoint must only be exposed to the mechanism that calls the endpoint. Regular users must not be able to call this. Perhaps we need to implement Roles+JWT.

[pfortuna]

We also need design and copy for the push notification.

The message can perhaps be a parameter sent to the endpoint.

[geiras]

MOBILE:

https://www.figma.com/file/BfK7HtPsvxZAwZLg1ebz2u/Covidografia?node-id=3273%3A5444

DESKTOP:

https://www.figma.com/file/BfK7HtPsvxZAwZLg1ebz2u/Covidografia?node-id=3345%3A5651

[pfortuna]

Another idea for a push notification is:

• Once a day (must not coincide with the other push notification above), send a push notification to users whose postal code had more than X status updates from other users since he last visited (column last_login). X is a var defined in env.
• The time for this push notification must not coincide with the time for sending the first push notification described in the first post of this thread.

We will need copy for this push.

[pfortuna]

@geiras the design above are not push notifications. I believe push notifications all have the same design, a rectangle. That means that we only need the copy to move forward.

[pfortuna]

No design is needed here. My mistake.

Push notifications we want:

• We want to send a message to all the users if they haven't submitted a "actualização de estado" for more than 24h. Sent at 8pm, with 10min intervals every batch.
• A push notification to users whose postal code had more than X status updates from other users since he last visited (column last_login). X is a var defined in env.

Example parameters:
[
{
"title": "push title 1",
"message": "message body 1"
"scheduled": "8pm",
"batchInterval": "10min",
"batchSize": 5000
},
{
"title": "push title 2",
"message": "message body 2"
"scheduled": "12pm",
"batchInterval": "10min",
"batchSize": 10000
},
...
]

I'll attach copy later.

[carlospombeiro]

This requires a new lambda.

Execute script should be something like
npm run notify-users-no-update-24h