Adds index for vulnerability findings

db/migrate/20210310000627_add_idx_vulnerability_occurrences_dedup.rb

+# frozen_string_literal: true
+
+# See https://docs.gitlab.com/ee/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddIdxVulnerabilityOccurrencesDedup < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  TABLE = :vulnerability_occurrences
+  INDEX_NAME = 'index_vulnerability_occurrences_deduplication'
+  COLUMNS = %i[project_id report_type project_fingerprint]
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index TABLE, COLUMNS, name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index TABLE, COLUMNS, name: INDEX_NAME
+  end
+end

db/schema_migrations/20210310000627

+71cea758ecb70049468531f70c52aec021060cd48e58155de0ba118786562ac6
\ No newline at end of file

db/structure.sql

@@ -23990,6 +23990,8 @@ CREATE UNIQUE INDEX index_vulnerability_occurrence_identifiers_on_unique_keys ON
 
 CREATE INDEX index_vulnerability_occurrence_pipelines_on_pipeline_id ON vulnerability_occurrence_pipelines USING btree (pipeline_id);
 
+CREATE INDEX index_vulnerability_occurrences_deduplication ON vulnerability_occurrences USING btree (project_id, report_type, project_fingerprint);
+
 CREATE INDEX index_vulnerability_occurrences_for_issue_links_migration ON vulnerability_occurrences USING btree (project_id, report_type, encode(project_fingerprint, 'hex'::text));
 
 CREATE INDEX index_vulnerability_occurrences_on_primary_identifier_id ON vulnerability_occurrences USING btree (primary_identifier_id);

ee/changelogs/unreleased/pipeline_vulnerabilities_finder_n_1_fix.yml

 ---
-title: Eager load vulnerabilities for better database performance
+title: Pipline vulnerabilities loading performance improvements
 merge_request: 55692
 author:
 type: performance