Add jsonb field for Finding Evidence

Changelog: changed

db/migrate/20210908195506_add_data_to_vulnerability_finding_evidence.rb

+# frozen_string_literal: true
+
+class AddDataToVulnerabilityFindingEvidence < Gitlab::Database::Migration[1.0]
+  def change
+    add_column :vulnerability_finding_evidences, :data, :jsonb, default: {}, null: false
+  end
+end

db/schema_migrations/20210908195506

+1ad794ac96f6297203046562c2ec422fbb4d1818a65266bb92179096040f7d82
\ No newline at end of file

db/structure.sql

@@ -20340,6 +20340,7 @@ CREATE TABLE vulnerability_finding_evidences (
     updated_at timestamp with time zone NOT NULL,
     vulnerability_occurrence_id bigint NOT NULL,
     summary text,
+    data jsonb DEFAULT '{}'::jsonb NOT NULL,
     CONSTRAINT check_5773b236fb CHECK ((char_length(summary) <= 8000000))
 );
 

ee/app/models/vulnerabilities/finding/evidence.rb

@@ -33,6 +33,7 @@ module Vulnerabilities
                foreign_key: 'vulnerability_finding_evidence_id'
 
       validates :summary, length: { maximum: 8_000_000 }
+      validates :data, length: { maximum: 16_000_000 }, presence: true
     end
   end
 end

ee/spec/models/vulnerabilities/finding/evidence_spec.rb

@@ -46,4 +46,6 @@ RSpec.describe Vulnerabilities::Finding::Evidence do
   }
 
   it { is_expected.to validate_length_of(:summary).is_at_most(8_000_000) }
+  it { is_expected.to validate_presence_of(:data) }
+  it { is_expected.to validate_length_of(:data).is_at_most(16_000_000) }
 end

spec/db/schema_spec.rb

@@ -204,7 +204,8 @@ RSpec.describe 'Database schema' do
     "Operations::FeatureFlags::Strategy" => %w[parameters],
     "Packages::Composer::Metadatum" => %w[composer_json],
     "RawUsageData" => %w[payload], # Usage data payload changes often, we cannot use one schema
-    "Releases::Evidence" => %w[summary]
+    "Releases::Evidence" => %w[summary],
+    "Vulnerabilities::Finding::Evidence" => %w[data] # Validation work in progress
   }.freeze
 
   # We are skipping GEO models for now as it adds up complexity