Fix next-job query to do round-robin through job groups

modules/store/src/test/resources/logback-test.xml

@@ -0,0 +1,14 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <withJansi>true</withJansi>
+
+        <encoder>
+            <pattern>%highlight(%-5level) %cyan(%logger{15}) - %msg %n</pattern>
+        </encoder>
+    </appender>
+
+    <logger name="docspell" level="warn" />
+    <root level="error">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>