Fixed bug with BigTable row key

The key did not allow each impression to be seen as different to the others, so we would end up with only about 20 rows

adtech-storage/src/main/java/gcp/cm/bigdata/adtech/BigtableHelper.java

@@ -44,7 +44,7 @@ public class BigtableHelper {
         Table table = null;
         try {
             table = BigtableHelper.getConnection().getTable(TableName.valueOf("impressions"));
-            Put p = new Put(Bytes.toBytes(String.format("%s#%s#%d#%d", entry.getSiteCategory(), entry.getAppCategory(), entry.getDeviceType(), entry.getHour())));
+            Put p = new Put(Bytes.toBytes(String.format("%s#%s#%d#%s", entry.getSiteCategory(), entry.getAppCategory(), entry.getDeviceType(), entry.getImpressionId())));
             p.addColumn(CF1, Bytes.toBytes("ID"), Bytes.toBytes(entry.getImpressionId()));
             p.addColumn(CF1, Bytes.toBytes("CLICK"), Bytes.toBytes(entry.getClicked()));
             p.addColumn(CF1, Bytes.toBytes("HOUR"), Bytes.toBytes(entry.getHour()));