Speed up bulk sample deletes and the follow-up materialized view refresh

api/src/org/labkey/api/data/MaterializedQueryHelper.java

@@ -382,6 +382,12 @@ public boolean peekValid(long createdTime)
             return peekValid();
         }
 
+        /** Supplier value as of the last {@link #stillValid} or {@link #markValidAs}; null before either. */
+        public @Nullable String snapshot()
+        {
+            return _result.get();
+        }
+
         /**
          * Current supplier value, with no change to the stored snapshot. Capture this before doing work,
          * then pass it to {@link #markValidAs} once the work has committed.

api/src/org/labkey/api/exp/api/SampleTypeService.java

@@ -268,6 +268,9 @@ default Map<String, Long> incrementSampleCounts(@Nullable Date counterDate)
 
     int recomputeSampleTypeRollup(@NotNull ExpSampleType sampleType, Set<Long> rootRowIds, Set<String> parentNames, Container container) throws IllegalStateException, SQLException;
 
+    /** Callers that delete exp.material rows directly must call this, or the sample type's materialized view keeps them. @param deletedRowIds null forces a full reconcile */
+    void refreshSampleTypeMaterializedViewAfterDelete(@NotNull ExpSampleType st, @Nullable Collection<Long> deletedRowIds);
+
     Map<String, Integer> moveSamples(Collection<? extends ExpMaterial> samples, @NotNull Container sourceContainer, @NotNull Container targetContainer, @NotNull User user, @Nullable String userComment, @Nullable AuditBehaviorType auditBehavior) throws ExperimentException, BatchValidationException;
 
     long getCurrentCount(NameGenerator.EntityCounter counterType, Container container);