Remove PostgreSQL monkey patch

Rails 5 added support for indexes with expressions, and this
is necessary to update db/schema.rb.
145 jobs for sh-add-index-extern-uid in 5 minutes and 13 seconds (queued for 6 seconds)
latest
Status Job ID Name Coverage
  Build
manual #186913990
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review-docs-deploy-manual
 
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build-qa-image

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compile-assets

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retrieve-tests-metadata

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setup-test-env

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danger-review
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db:check-schema-pg
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review-build-cng
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review-qa-smoke
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review-stop
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rspec-mysql 1/50
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sast
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static-analysis
 
  Post Test
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coverage
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flaky-examples-check
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jsdoc
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lint:javascript:report
 
  Post Cleanup
skipped #186914162
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review-docs-cleanup
 
Name Stage Failure
failed
compile-assets Prepare
-- create_table("issue_assignees", {:id=>false, :force=>:cascade})
-> 0.0106s
-- create_table("issue_metrics", {:force=>:cascade})
-> 0.0092s
-- create_table("issues", {:force=>:cascade})
Running after script...
$ date
Fri Mar 29 15:44:21 UTC 2019
ERROR: Job failed: exit code 1
failed
setup-test-env Prepare
-- create_table("issue_assignees", {:id=>false, :force=>:cascade})
-> 0.0091s
-- create_table("issue_metrics", {:force=>:cascade})
-> 0.0079s
-- create_table("issues", {:force=>:cascade})
Running after script...
$ date
Fri Mar 29 15:45:05 UTC 2019
ERROR: Job failed: exit code 1