diff --git a/src/main/java/org/gcube/accounting/analytics/persistence/AccountingPersistenceBackendQuery.java b/src/main/java/org/gcube/accounting/analytics/persistence/AccountingPersistenceBackendQuery.java
index 47d1e8d..c732087 100644
--- a/src/main/java/org/gcube/accounting/analytics/persistence/AccountingPersistenceBackendQuery.java
+++ b/src/main/java/org/gcube/accounting/analytics/persistence/AccountingPersistenceBackendQuery.java
@@ -52,7 +52,6 @@ public interface AccountingPersistenceBackendQuery {
 	 */
 	public void setTemporalConstraint(TemporalConstraint temporalConstraint);
 	
-	
 	/**
 	 * @param contexts the list of context to use as filter
 	 * 
@@ -118,10 +117,8 @@ public interface AccountingPersistenceBackendQuery {
 	
 	public Record getRecord(String recordId, String type) throws Exception;
 
-	
 	public SortedMap<Filter, SortedMap<Calendar, Info>> getSpaceTimeSeries(Set<String> dataTypes) throws Exception;
 
-	
 	/**
 	 * getUsageValueQuotaTotal
 	 *
@@ -169,7 +166,6 @@ public interface AccountingPersistenceBackendQuery {
 	public List<UsageValue> getUsageValueQuotaTotal(List<UsageValue> listUsage)
 			throws Exception;
 
-	
 	boolean isConnectionActive() throws Exception;
 
 }
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