feat(exports): preserve transfer decisions (#1639)

* feat(exports): preserve transfer decisions

* fix(api): apply transfer date filters to both sides

* fix(api): refine transfer decision handling

* fix(api): align transfer decision schemas

* fix(api): use current context for transfer filters

* fix(api): include either side in transfer date filters

* fix(api): deduplicate transfer decision filters

* fix(api): guard transfer decision exports

app/controllers/api/v1/rejected_transfers_controller.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+class Api::V1::RejectedTransfersController < Api::V1::BaseController
+  include Pagy::Backend
+  include Api::V1::TransferDecisionFiltering
+
+  before_action :ensure_read_scope
+  before_action :set_rejected_transfer, only: :show
+
+  def index
+    rejected_transfers_query = apply_transfer_decision_filters(rejected_transfers_scope).order(created_at: :desc)
+    @per_page = safe_per_page_param
+
+    @pagy, @rejected_transfers = pagy(
+      rejected_transfers_query,
+      page: safe_page_param,
+      limit: @per_page
+    )
+
+    render :index
+  rescue Api::V1::TransferDecisionFiltering::InvalidFilterError => e
+    render_validation_error(e.message)
+  end
+
+  def show
+    render :show
+  end
+
+  private
+
+    def set_rejected_transfer
+      raise ActiveRecord::RecordNotFound unless valid_uuid?(params[:id])
+
+      @rejected_transfer = rejected_transfers_scope.find(params[:id])
+    end
+
+    def rejected_transfers_scope
+      transfer_decision_scope(RejectedTransfer)
+    end
+end