Remaining issuses

[ybkuroki]

The remaining issues are as follows.

• Remove debug code in config.go.
• Change table name for the following entities.
  • Reference

Entity Name	Before	After
Category	categories	category_master
Format	formats	format_master

• Consider output of logging.
• Consider error handling.

I will rise as separate issues if it necessary.

[ybkuroki]

implementation memo

• How to implement echo middleware

  • https://ken-aio.github.io/post/2019/02/06/golang-echo-middleware/
  • https://echo.labstack.com/cookbook/middleware

• Logging for Gorm

  • https://www.soberkoder.com/go-gorm-logging/

• Logging implementation of echo

  • https://github.com/labstack/echo/blob/master/middleware/logger.go

• Logging Type

  • Info
  • Debug
  • Warn
  • Error