Drools: Sliding window:time is selecting even elapsed data - drools

Question

I wanted to check Anomalous events in a window of say 3 days. I have a following drools code which outputs all events and not restricting to just 3 days. Same problem happens even if I put 1 day instead of 3. I do fireAllRules after each insert.
If use window:length(3) it works perfectly but not by time. Is there anything wrong I am doing?
Also, I have another question #expires annotation, does it work on my custom timestamp or from the time an event/fact inserted into working memory?
Have put simplified unit test at https://github.com/mtekp/droolsExperiments/tree/main/testdrools
I am using drools:7.43.1.Final.
My kmodule.xml
<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.drools.org/xsd/kmodule">
<kbase name="TestEventsC" packages="test.events.continuous" eventProcessingMode="stream">
<ksession name="TestDroolEventsContinous" clockType="realtime"/>
</kbase>
</kmodule>
The drool rule
package test.events.continuous
declare AnomalyCount
#role(event)
#timestamp(anomalyDate)
#expires(3d)
end
rule "insert anomaly count"
dialect "java"
when
$aei: AnomalyEventInsert()
not AnomalyCount(anomalyDate == $aei.ts)
then
insert(new AnomalyCount($aei.getTs(), 1));
delete($aei);
end
rule "increment count"
dialect "java"
when
$aei: AnomalyEventInsert()
$ac: AnomalyCount(anomalyDate == $aei.ts)
then
modify($ac) { setAnomalyCount($ac.getAnomalyCount() + 1)};
delete($aei);
end
rule "Check continuous 3 days"
dialect "java"
when
$anomalies : List() from accumulate(AnomalyCount($dt : anomalyDate) over window:time(3d);collectList( $dt ))
then
System.out.println("anomalies: "+ $anomalies);
end
AnomalyCount.java
import org.kie.api.definition.type.Role;
import java.util.Date;
#org.kie.api.definition.type.Role(Role.Type.EVENT)
#org.kie.api.definition.type.Timestamp("anomalyDate")
//#org.kie.api.definition.type.Expires("1d")
public class AnomalyCount {
public AnomalyCount(Date anomalyDate, int anomalyCount) {
this.anomalyDate = anomalyDate;
this.anomalyCount = anomalyCount;
}
public Date getAnomalyDate() {
return anomalyDate;
}
public void setAnomalyDate(Date anomalyDate) {
this.anomalyDate = anomalyDate;
}
public int getAnomalyCount() {
return anomalyCount;
}
public void setAnomalyCount(int anomalyCount) {
this.anomalyCount = anomalyCount;
}
#Override
public String toString() {
return "AnomalyCount{" +
"anomalyDate=" + anomalyDate +
", anomalyCount=" + anomalyCount +
'}';
}
private Date anomalyDate;
private int anomalyCount = 0;
}
AnomalyEventInsert.java
import java.time.LocalDate;
import java.time.ZoneOffset;
import java.util.Date;
public class AnomalyEventInsert extends AnomalyEvent {
public AnomalyEventInsert(LocalDate ts, long sequenceCount, long value) {
this.ts = Date.from(ts.atStartOfDay().toInstant( ZoneOffset.UTC));
this.value = value;
this.sequenceCount = sequenceCount;
}
public AnomalyEvent toAnomalyEvent() {
return new AnomalyEvent(ts, sequenceCount, value);
}
#Override
public String toString() {
return "AnomalyEventInsert{" +
"ts=" + ts +
", sequenceCount=" + sequenceCount +
", value=" + value +
'}';
}
}
When I insert data for 6th,7th,8th,9th I get all four instead of last 3 when the window moves.
found output
anomalies: [Tue Oct 06 05:30:00 IST 2020, Wed Oct 07 05:30:00 IST 2020, Thu Oct 08 05:30:00 IST 2020, Fri Oct 09 05:30:00 IST 2020]
instead of
anomalies: [Wed Oct 07 05:30:00 IST 2020, Thu Oct 08 05:30:00 IST 2020, Fri Oct 09 05:30:00 IST 2020]