Give pending entities BBIDs and treat them the same way as regular entities

package.json

@@ -40,7 +40,7 @@
     "@fortawesome/free-brands-svg-icons": "^6.4.2",
     "@fortawesome/free-solid-svg-icons": "^6.4.2",
     "@fortawesome/react-fontawesome": "^0.1.11",
-    "bookbrainz-data": "5.1.1",
+    "bookbrainz-data": "^5.3.0",
     "chart.js": "^2.9.4",
     "chartjs-adapter-date-fns": "^1.0.0",
     "classnames": "^2.3.2",

sql/migrations/import/down.sql

@@ -7,13 +7,21 @@ DROP VIEW IF EXISTS bookbrainz.publisher_import;
 DROP VIEW IF EXISTS bookbrainz.series_import;
 DROP VIEW IF EXISTS bookbrainz.work_import;
 
+-- Only drop these tables if the database contains no pending imports!
 DROP TABLE IF EXISTS bookbrainz.author_import_header;
 DROP TABLE IF EXISTS bookbrainz.edition_import_header;
 DROP TABLE IF EXISTS bookbrainz.edition_group_import_header;
 DROP TABLE IF EXISTS bookbrainz.publisher_import_header;
 DROP TABLE IF EXISTS bookbrainz.series_import_header;
 DROP TABLE IF EXISTS bookbrainz.work_import_header;
 DROP TABLE IF EXISTS bookbrainz.discard_votes;
+DROP TABLE IF EXISTS bookbrainz.import_metadata;
+DROP TABLE IF EXISTS bookbrainz.external_source;
+
+-- Only drop this column if the database contains no pending imports!
+ALTER TABLE entity DROP COLUMN IF EXISTS is_import;
+
+-- Legacy tables from an earlier version of the import schema.
 DROP TABLE IF EXISTS bookbrainz.link_import;
 DROP TABLE IF EXISTS bookbrainz.origin_source;
 DROP TABLE IF EXISTS bookbrainz.import;