Ruby - SQL Expert needed

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Ruby - SQL Expert needed
We have a Ruby and SQL code that runs multiple jobs on our website. We are trying to add a small piece of code to our latest code which is a very complex SQL Query embedded in Ruby. This piece of code will help perform a certain action on one of our DB tables, and we need a SQL Expert (who understands and can edit very complex SQL queries) who also has experience coding in Ruby to make this change for us.
Business logic and Test Case for this edit will be explained once we receive your proposal. This change should be made to staging instance, tested, and then deployed to production without any bugs.
Skills:
PostgreSQL
, Ruby on Rails

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