Add index to security_findings on scan_id and deduplicated

db/migrate/20200914183227_add_index_on_deduplicated_column_of_security_findings.rb

+# frozen_string_literal: true
+
+class AddIndexOnDeduplicatedColumnOfSecurityFindings < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_security_findings_on_scan_id_and_deduplicated'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :security_findings, [:scan_id, :deduplicated], name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index_by_name :security_findings, INDEX_NAME
+  end
+end

db/schema_migrations/20200914183227

+570a7de82da3dabfd12f3099cdc028128d4b61a4ecf6edd4b3102031d914316c
\ No newline at end of file

db/structure.sql

@@ -20960,6 +20960,8 @@ CREATE INDEX index_security_findings_on_project_fingerprint ON public.security_f
 
 CREATE INDEX index_security_findings_on_scan_id ON public.security_findings USING btree (scan_id);
 
+CREATE INDEX index_security_findings_on_scan_id_and_deduplicated ON public.security_findings USING btree (scan_id, deduplicated);
+
 CREATE INDEX index_security_findings_on_scanner_id ON public.security_findings USING btree (scanner_id);
 
 CREATE INDEX index_security_findings_on_severity ON public.security_findings USING btree (severity);