Zero to production

Chapter 3
1. Splitting main into modules
    - configurations
    - routes/
    - startup
2. Creating subscription and health_check endpoints
    - Adding into routes folders.
3. Connecting to postgres database using Docker
    - Using Docker for postgres is to me.
    - Using sqlx for migration and querying.
    - Sqlx .env file for database_url. 
4. Setting up test
    - testing which I usually do manually.
    - Creating test would like to see how database roll back is used.
    - Thing to do
        - I would like to split the test into different modules.

Chapter 4
1. Need to review alot of time lapsed between starting and ending this chapter
   basic of logging would like to check out roll backs using the database instead
   of mocking up a new database each time. Probably will review over the next few days before jumping into chapter 5.