Rewrite import feature (#21054)

app/workers/import/relationship_worker.rb

@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+# NOTE: This is a deprecated worker, only kept to not break ongoing imports
+# on upgrade. See `Import::RowWorker` for its replacement.
+
 class Import::RelationshipWorker
   include Sidekiq::Worker
 

app/workers/import/row_worker.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class Import::RowWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: 'pull', retry: 6, dead: false
+
+  sidekiq_retries_exhausted do |msg, _exception|
+    ActiveRecord::Base.connection_pool.with_connection do
+      # Increment the total number of processed items, and bump the state of the import if needed
+      bulk_import_id = BulkImportRow.where(id: msg['args'][0]).pick(:id)
+      BulkImport.progress!(bulk_import_id) unless bulk_import_id.nil?
+    end
+  end
+
+  def perform(row_id)
+    row = BulkImportRow.eager_load(bulk_import: :account).find_by(id: row_id)
+    return true if row.nil?
+
+    imported = BulkImportRowService.new.call(row)
+
+    mark_as_processed!(row, imported)
+  end
+
+  private
+
+  def mark_as_processed!(row, imported)
+    bulk_import_id = row.bulk_import_id
+    row.destroy! if imported
+
+    BulkImport.progress!(bulk_import_id, imported: imported)
+  end
+end