Automatically cleaning expired anonymous user accounts

[hoiekim]

1. Why am I doing this?

See also

Implement anonymous user's database creation #228

Feedback from HN

Application plan

• Anonymous user: Provide temporary database with expiration after a certain period of time (Anonymous user means user account that has no email data)
• Authenticated user: Provide database that is permanently usable

2. What it changes

• Add lib/util.js file
  • It has cleanAnonymous function.
  • This function queries expired user accounts and delete their postgres and elasticsearch database as well as the user account itself
  • It runs again in every 24 hours
• Modify server.js file
  • When server starts, it runs cleanAnonymous function

[codecov[bot]]

Codecov Report

Merging #231 into master will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #231   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        12    +1     
  Lines          410       445   +35     
  Branches        41        43    +2     
=========================================
+ Hits           410       445   +35     

Impacted Files	Coverage Δ
database/elasticsearch/elastic.js	100.00% <100.00%> (ø)
database/postgres/pg.js	100.00% <100.00%> (ø)
lib/util.js	100.00% <100.00%> (ø)
src/server.js	100.00% <100.00%> (ø)

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