diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 695dcc178..2148d77ba 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -43,6 +43,7 @@ scrape_configs:
   * `vm_rows_read_per_series` - the number of raw samples read per queried series.
   * `vm_series_read_per_query` - the number of series read per query.
 
+* BUGFIX: properly register time series in per-day inverted index. Previously some series could miss registration in the per-day inverted index. This could result in missing time series during querying. The issue has been introduced in [v1.78.0](#v1780).
 * BUGFIX: [vmalert](https://docs.victoriametrics.com/vmalert.html): allow using `__name__` label (aka [metric name](https://prometheus.io/docs/prometheus/latest/querying/basics/#time-series-selectors)) in alerting annotations. For example:
 
 {% raw %}
@@ -61,12 +62,11 @@ scrape_configs:
 
 ## [v1.78.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.78.0)
 
-**Warning (03-07-2022):** some users report issues with incomplete data returned from queries for cluster version. 
-The problem is currently under investigation. This message will be updated as soon as the problem 
-will be localized and solved. Meanwhile, we recommend postpone updating to 1.78.0.
-
 Released at 20-06-2022
 
+**Warning (03-07-2022):** VictoriaMetrics v1.78.0 contains a bug, which may result in missing time series during queries.
+It is recommended downgrading to [v1.77.2](#v1772) until the bugfix release.
+
 **Update notes:** this release introduces backwards-incompatible changes to communication protocol between `vmselect` and `vmstorage` nodes in cluster version of VictoriaMetrics because of added [query tracing](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#query-tracing), so `vmselect` and `vmstorage` nodes will experience communication errors and read requests to `vmselect` will fail until the upgrade is complete. These errors will stop after all the `vmselect` and `vmstorage` nodes are updated to the new release. It is safe to downgrade to previous releases.
 
 * SECURITY: add `-flagsAuthKey` command-line flag for protecting `/flags` endpoint from unauthorized access. Though this endpoint already hides values for command-line flags with `key` and `password` substrings in their names, other sensitive information could be exposed there. See [This issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2753).
diff --git a/lib/storage/index_db.go b/lib/storage/index_db.go
index 9be118f91..60e612ccf 100644
--- a/lib/storage/index_db.go
+++ b/lib/storage/index_db.go
@@ -2724,6 +2724,7 @@ func (is *indexSearch) createPerDayIndexes(date, metricID uint64, mn *MetricName
 	if err := is.db.tb.AddItems(ii.Items); err != nil {
 		return fmt.Errorf("cannot add per-day entires for metricID %d: %w", metricID, err)
 	}
+	is.db.s.dateMetricIDCache.Set(date, metricID)
 	return nil
 }
 
diff --git a/lib/storage/index_db_test.go b/lib/storage/index_db_test.go
index 4e947ac7a..5af5605a4 100644
--- a/lib/storage/index_db_test.go
+++ b/lib/storage/index_db_test.go
@@ -2067,9 +2067,10 @@ func newTestStorage() *Storage {
 	s := &Storage{
 		cachePath: "test-storage-cache",
 
-		metricIDCache:   workingsetcache.New(1234),
-		metricNameCache: workingsetcache.New(1234),
-		tsidCache:       workingsetcache.New(1234),
+		metricIDCache:     workingsetcache.New(1234),
+		metricNameCache:   workingsetcache.New(1234),
+		tsidCache:         workingsetcache.New(1234),
+		dateMetricIDCache: newDateMetricIDCache(),
 	}
 	s.setDeletedMetricIDs(&uint64set.Set{})
 	return s
diff --git a/lib/storage/storage.go b/lib/storage/storage.go
index 3135d3bfa..27e0ee7c8 100644
--- a/lib/storage/storage.go
+++ b/lib/storage/storage.go
@@ -1708,7 +1708,6 @@ func (s *Storage) RegisterMetricNames(qt *querytracer.Tracer, mrs []MetricRow) e
 		}
 		genTSID.generation = idb.generation
 		s.putTSIDToCache(&genTSID, mr.MetricNameRaw)
-		s.dateMetricIDCache.Set(date, genTSID.TSID.MetricID)
 	}
 	return nil
 }
@@ -1797,7 +1796,6 @@ func (s *Storage) add(rows []rawRow, dstMrs []*MetricRow, mrs []MetricRow, preci
 				if created {
 					genTSID.generation = idb.generation
 					s.putTSIDToCache(&genTSID, mr.MetricNameRaw)
-					s.dateMetricIDCache.Set(date, genTSID.TSID.MetricID)
 				}
 			}
 			continue
@@ -1860,7 +1858,6 @@ func (s *Storage) add(rows []rawRow, dstMrs []*MetricRow, mrs []MetricRow, preci
 			genTSID.generation = idb.generation
 			genTSID.TSID = r.TSID
 			s.putTSIDToCache(&genTSID, mr.MetricNameRaw)
-			s.dateMetricIDCache.Set(date, genTSID.TSID.MetricID)
 
 			prevTSID = r.TSID
 			prevMetricNameRaw = mr.MetricNameRaw