ActiveRecord::StatementInvalid: PG::NotNullViolation: ERROR: null value in column "a_mode" violates not-null constraint

https://sentry.gitlap.com/gitlab/gitlabcom/issues/41349/

PG::NotNullViolation: ERROR:  null value in column "a_mode" violates not-null constraint
DETAIL:  Failing row contains (37503, 0, t, f, f, f, null, null, controller/action/attendance/apply_leave.php, controller/action/attendance/apply_leave.php, --- /dev/null
+++ b/controller/action/attendance/apply_leave.php..., f).

  lib/gitlab/database.rb:100:in `bulk_insert'
    connection.execute <<-EOF
  lib/gitlab/background_migration/deserialize_merge_request_diffs_and_commits.rb:50:in `block in flush_buffers!'
    Gitlab::Database.bulk_insert('merge_request_diff_files', file_rows)
  lib/gitlab/background_migration/deserialize_merge_request_diffs_and_commits.rb:48:in `flush_buffers!'
    MergeRequestDiff.transaction do
  lib/gitlab/background_migration/deserialize_merge_request_diffs_and_commits.rb:31:in `block in perform'
    flush_buffers!
  lib/gitlab/background_migration/deserialize_merge_request_diffs_and_commits.rb:20:in `perform'
    merge_request_diffs.each do |merge_request_diff|
...
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