Add Revit return workbook export

src/db/migrations/0015_wide_night_thrasher.sql

@@ -0,0 +1,16 @@
+CREATE TABLE `external_export_batches` (
+	`id` text PRIMARY KEY NOT NULL,
+	`project_id` text NOT NULL,
+	`project_revision` integer NOT NULL,
+	`import_batch_id` text NOT NULL,
+	`exported_at_iso` text NOT NULL,
+	`file_name` text NOT NULL,
+	`sha256` text NOT NULL,
+	`configuration_snapshot` text NOT NULL,
+	`configuration_sha256` text NOT NULL,
+	`scope` text NOT NULL,
+	`object_count` integer NOT NULL,
+	FOREIGN KEY (`project_id`) REFERENCES `projects`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+CREATE INDEX `external_export_batches_project_exported_idx` ON `external_export_batches` (`project_id`,`exported_at_iso`);