Fix any-approver rule migration job failure

Currently it fails due to writing a value
which is out of the smallint range

ee/lib/gitlab/background_migration/populate_any_approval_rule_for_merge_requests.rb

@@ -5,13 +5,15 @@ module Gitlab
     # This background migration creates any approver rule records according
     # to the given merge request IDs range. A _single_ INSERT is issued for the given range.
     class PopulateAnyApprovalRuleForMergeRequests
+      MAX_VALUE = 2**15 - 1
+
       def perform(from_id, to_id)
         select_sql =
           MergeRequest
             .where(merge_request_approval_rules_not_exists_clause)
             .where(id: from_id..to_id)
             .where('approvals_before_merge <> 0')
-            .select("id, approvals_before_merge, created_at, updated_at, 4, '#{ApprovalRuleLike::ALL_MEMBERS}'")
+            .select("id, LEAST(#{MAX_VALUE}, approvals_before_merge), created_at, updated_at, 4, '#{ApprovalRuleLike::ALL_MEMBERS}'")
             .to_sql
 
         execute("INSERT INTO approval_merge_request_rules (merge_request_id, approvals_required, created_at, updated_at, rule_type, name) #{select_sql}")

ee/lib/gitlab/background_migration/populate_any_approval_rule_for_projects.rb

@@ -5,13 +5,15 @@ module Gitlab
     # This background migration creates any approver rule records according
     # to the given project IDs range. A _single_ INSERT is issued for the given range.
     class PopulateAnyApprovalRuleForProjects
+      MAX_VALUE = 2**15 - 1
+
       def perform(from_id, to_id)
         select_sql =
           Project
             .where(project_approval_rules_not_exists_clause)
             .where(id: from_id..to_id)
             .where('approvals_before_merge <> 0')
-            .select("id, approvals_before_merge, created_at, updated_at, 4, '#{ApprovalRuleLike::ALL_MEMBERS}'")
+            .select("id, LEAST(#{MAX_VALUE}, approvals_before_merge), created_at, updated_at, 4, '#{ApprovalRuleLike::ALL_MEMBERS}'")
             .to_sql
 
         execute("INSERT INTO approval_project_rules (project_id, approvals_required, created_at, updated_at, rule_type, name) #{select_sql}")

ee/spec/lib/gitlab/background_migration/populate_any_approval_rule_for_merge_requests_spec.rb

@@ -29,30 +29,34 @@ describe Gitlab::BackgroundMigration::PopulateAnyApprovalRuleForMergeRequests, :
 
     # Test filtering already migrated rows
     create_merge_request(4, approvals_before_merge: 3)
-    approval_merge_request_rules.create(id: 3,
+    approval_merge_request_rules.create(id: 4,
       merge_request_id: 4, approvals_required: 3, rule_type: 4, name: ApprovalRuleLike::ALL_MEMBERS)
 
     # Test filtering MRs with existing rules
     create_merge_request(5, approvals_before_merge: 3)
-    approval_merge_request_rules.create(id: 4,
+    approval_merge_request_rules.create(id: 5,
       merge_request_id: 5, approvals_required: 3, rule_type: 1, name: 'Regular rules')
 
     create_merge_request(6, approvals_before_merge: 5)
 
     # Test filtering rows with zero approvals_before_merge column
     create_merge_request(7, approvals_before_merge: 0)
+
+    # Test rows with too big approvals_before_merge value
+    create_merge_request(8, approvals_before_merge: 2**30)
   end
 
   describe '#perform' do
     it 'creates approval_merge_request_rules rows according to merge_requests' do
-      expect { subject.perform(1, 7) }.to change(ApprovalMergeRequestRule, :count).by(2)
+      expect { subject.perform(1, 8) }.to change(ApprovalMergeRequestRule, :count).by(3)
 
       created_rows = [
         { 'merge_request_id' => 2, 'approvals_required' => 2 },
         { 'merge_request_id' => 6, 'approvals_required' => 5 }
       ]
       existing_rows = [
-        { 'merge_request_id' => 4, 'approvals_required' => 3 }
+        { 'merge_request_id' => 4, 'approvals_required' => 3 },
+        { 'merge_request_id' => 8, 'approvals_required' => 2**15 - 1 }
       ]
 
       rows = approval_merge_request_rules.where(rule_type: 4).order(:id).map do |row|

ee/spec/lib/gitlab/background_migration/populate_any_approval_rule_for_projects_spec.rb

@@ -22,27 +22,29 @@ describe Gitlab::BackgroundMigration::PopulateAnyApprovalRuleForProjects, :migra
 
     # Test filtering already migrated rows
     create_project(4, approvals_before_merge: 3)
-    approval_project_rules.create(id: 3,
+    approval_project_rules.create(id: 4,
       project_id: 4, approvals_required: 3, rule_type: 4, name: ApprovalRuleLike::ALL_MEMBERS)
 
     # Test filtering MRs with existing rules
     create_project(5, approvals_before_merge: 3)
-    approval_project_rules.create(id: 4,
+    approval_project_rules.create(id: 5,
       project_id: 5, approvals_required: 3, rule_type: 1, name: 'Regular rules')
 
     create_project(6, approvals_before_merge: 5)
+    create_project(7, approvals_before_merge: 2**30)
   end
 
   describe '#perform' do
     it 'creates approval_project_rules rows according to projects' do
-      expect { subject.perform(1, 6) }.to change(ApprovalProjectRule, :count).by(2)
+      expect { subject.perform(1, 7) }.to change(ApprovalProjectRule, :count).by(3)
 
       created_rows = [
         { 'project_id' => 2, 'approvals_required' => 2 },
         { 'project_id' => 6, 'approvals_required' => 5 }
       ]
       existing_rows = [
-        { 'project_id' => 4, 'approvals_required' => 3 }
+        { 'project_id' => 4, 'approvals_required' => 3 },
+        { 'project_id' => 7, 'approvals_required' => 2**15 - 1 }
       ]
 
       rows = approval_project_rules.where(rule_type: 4).order(:id).map do |row|