Improved history check.

src/main/resources/db/migration/V1_0__create_history_schema.sql

@@ -13,7 +13,8 @@ WHERE r.id IN
 CREATE VIEW musicbrainz_enricher.release_work_queue AS
 SELECT *
 FROM musicbrainz_enricher.release_with_relationships r
-WHERE r.gid NOT IN (SELECT rhe.release_gid FROM musicbrainz_enricher.release_history_entry rhe);
+		 LEFT JOIN musicbrainz_enricher.release_history_entry rhe ON r.gid = rhe.release_gid
+WHERE rhe.release_gid IS NULL;
 
 
 CREATE TABLE musicbrainz_enricher.release_group_history_entry
@@ -22,7 +23,7 @@ CREATE TABLE musicbrainz_enricher.release_group_history_entry
 		ON DELETE CASCADE
 );
 
-CREATE MATERIALIZED VIEW musicbrainz_enricher.release_group_with_relationships AS
+CREATE VIEW musicbrainz_enricher.release_group_with_relationships AS
 SELECT *
 FROM musicbrainz.release_group rg
 WHERE rg.id IN
@@ -31,4 +32,5 @@ WHERE rg.id IN
 CREATE VIEW musicbrainz_enricher.release_group_work_queue AS
 SELECT *
 FROM musicbrainz_enricher.release_group_with_relationships rg
-WHERE rg.gid NOT IN (SELECT rghe.release_group_gid FROM musicbrainz_enricher.release_group_history_entry rghe);
+		 LEFT JOIN musicbrainz_enricher.release_group_history_entry rghe ON rg.gid = rghe.release_group_gid
+WHERE rghe.release_group_gid IS NULL;