Added additional indexes to speed up DELETE query of old jobs

The query in ExpirationManager already has an index to use on the "counter" table, but not the related tables as per ExpirationManager.ProcessedTables (counter, job, list, set, hash)

Author: Plasma

src/Hangfire.PostgreSql/Scripts/Install.v15.sql

@@ -0,0 +1,17 @@
+SET search_path = 'hangfire';
+
+DO
+$$
+BEGIN
+  IF EXISTS (SELECT 1 FROM "schema" WHERE "version"::integer >= 15) THEN
+    RAISE EXCEPTION 'version-already-applied';
+  END IF;
+END
+$$;
+
+CREATE INDEX ix_hangfire_job_expireat ON "job" (expireat);
+CREATE INDEX ix_hangfire_list_expireat ON "list" (expireat);
+CREATE INDEX ix_hangfire_set_expireat ON "set" (expireat);
+CREATE INDEX ix_hangfire_hash_expireat ON "hash" (expireat);
+
+RESET search_path;

tests/Hangfire.PostgreSql.Tests/PostgreSqlInstallerFacts.cs

@@ -20,7 +20,7 @@ public void InstallingSchemaUpdatesVersionAndShouldNotThrowAnException()
 					PostgreSqlObjectsInstaller.Install(connection, schemaName);
 
 					var lastVersion = connection.Query<int>(@"select version from """ + schemaName + @""".""schema""").Single();
-					Assert.Equal(14, lastVersion);
+					Assert.Equal(15, lastVersion);
 
 					connection.Execute($@"DROP SCHEMA ""{schemaName}"" CASCADE;");
 				});