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day4/README.md

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+# day 4
+
+## Instructions
+
+- setup project
+- clone to your github
+- Read the documentation https://sequelize.org/v7/manual/getting-started.html
+- Setup the following Models in models folder. Make sure tables made by sequelize:
+
+```
+email
+- id
+- slug (unique)
+- subject
+- body
+- status ENUM(active, inactive) (integer mapping)
+
+email_queue
+- id
+- email_id
+- user_id
+- status ENUM(send, not sent) (integer mapping)
+- created_at
+- send_at
+- updated_at
+
+user
+- id
+- email
+- name
+- status ENUM(active, inactive) (integer mapping)
+```
+
+- Make the CRUD API for these tables
+
+```
+GET /api/v1/email (get all)
+GET /api/v1/email/:id (get one)
+POST /api/v1/email/:id (add one)
+PUT /api/v1/email/:id (update one)
+DELETE /api/v1/email/:id (delete one)
+
+GET /api/v1/user (get all)
+GET /api/v1/user/:id (get one)
+POST /api/v1/user/:id (add one)
+PUT /api/v1/user/:id (update one)
+DELETE /api/v1/user/:id (delete one)
+```
+
+- create a cronjob called email_queue.js in cronjob folder
+- this cronjob will be run once a day
+- Algorithm:
+
+```
+1.Loop through all active users
+2.Loop through all odd id emails if today is monday, wednesday, friday. Otherwise do all even id for other days.
+3.Write into email queue what email to send from step 2. Set status as not sent. Set send_at as next day.
+```
+
+- create a cronjob called email_sending.js in cronjob folder
+- this cronjob will be run once a day
+- Algorithm:
+
+```
+1.Loop through all email_queue table that have send_at as today.
+2.Query user table to collect email and name. In email template selected, replace {{{NAME}}} and {{{EMAIL}}} with user email and name.
+3.Send email to user. Use https://mailtrap.io/ to send the email
+4.Mark Email status as sent
+```
+
+- Everything must be done by end of date