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Remove old migrations - Part II

Diogo Frazão requested to merge 331248-remove-old-migrations-in-release-14-part-2 into master

What does this MR do and why?

In this MR, we are squashing migrations before 2020.12.12.

Part I had an impact of 5 minutes on rspec migration jobs 🎉 🎉 🎉

We still need to have a Part III, where we are going to continue the cleanup :)

I have used the following script to be able to squash the migrations and remove the spec files.

  1. bundle exec rake db:drop db:create db:migrate VERSION=20201211042306 -> Drops the database; Creates a new database; Migrates to a specific version
  2. bundle exec rake db:structure:dump SCHEMA=db/init_structure.sql -> Creates a new structure file with the name init_structure.sql
  3. rake remove_old_migrations[20201211042306] -> Removes all migration files + specs (*) MR
  4. bundle exec rake db:drop db:create db:migrate -> Creates a new database without using the old migrations

(*) We are not removing the init schema migration.

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Related to #331248 (closed)

Edited by Diogo Frazão

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