diff --git a/pkg/activity/redis.go b/pkg/activity/redis.go
index d1d9bb50..4f0f7944 100644
--- a/pkg/activity/redis.go
+++ b/pkg/activity/redis.go
@@ -43,7 +43,7 @@ func (s *RedisStore) IncrementMany(ctx context.Context, events []Event) error {
 
 	aggregated := make(map[counterKey]uint32)
 	for _, event := range events {
-		if event.EnvUUID == "" || event.NodeUUID == "" || event.Type >= EventTypeCount {
+		if event.EnvUUID == "" || event.Type >= EventTypeCount {
 			continue
 		}
 
@@ -51,11 +51,20 @@ func (s *RedisStore) IncrementMany(ctx context.Context, events []Event) error {
 			continue
 		}
 
-		key := counterKey{
-			key:    DayKey(s.prefix, event.EnvUUID, event.NodeUUID, event.At),
-			offset: bitOffset(event.Type, bucketHour(event.At)),
+		offset := bitOffset(event.Type, bucketHour(event.At))
+		if event.NodeUUID != "" {
+			nodeKey := counterKey{
+				key:    DayKey(s.prefix, event.EnvUUID, event.NodeUUID, event.At),
+				offset: offset,
+			}
+			aggregated[nodeKey] += uint32(event.Count)
+		}
+
+		envKey := counterKey{
+			key:    EnvDayKey(s.prefix, event.EnvUUID, event.At),
+			offset: offset,
 		}
-		aggregated[key] += uint32(event.Count)
+		aggregated[envKey] += uint32(event.Count)
 	}
 
 	if len(aggregated) == 0 {
@@ -95,17 +104,7 @@ func (s *RedisStore) ReadSeries(ctx context.Context, envUUID string, nodeUUIDs [
 	pipe := s.client.Pipeline()
 	fetches := make([]dayFetch, 0, len(nodeUUIDs)*days)
 	for _, nodeUUID := range nodeUUIDs {
-		out[nodeUUID] = NodeTileSeries{
-			Start:         start,
-			BucketSeconds: BucketSeconds,
-			Enroll:        make([]uint16, bucketCount),
-			Config:        make([]uint16, bucketCount),
-			Status:        make([]uint16, bucketCount),
-			Result:        make([]uint16, bucketCount),
-			QueryRead:     make([]uint16, bucketCount),
-			QueryWrite:    make([]uint16, bucketCount),
-			Total:         make([]uint16, bucketCount),
-		}
+		out[nodeUUID] = newSeries(start, bucketCount)
 
 		for dayIndex := 0; dayIndex < days; dayIndex++ {
 			day := start.Add(time.Duration(dayIndex) * 24 * time.Hour)
@@ -161,6 +160,80 @@ func (s *RedisStore) ReadSeries(ctx context.Context, envUUID string, nodeUUIDs [
 	return out, nil
 }
 
+// ReadEnvSeries returns a dense environment activity series for the requested day window.
+func (s *RedisStore) ReadEnvSeries(ctx context.Context, envUUID string, end time.Time, days int) (EnvSeries, error) {
+	if days <= 0 {
+		days = 1
+	}
+
+	start := dayStart(end).Add(-time.Duration(days-1) * 24 * time.Hour)
+	bucketCount := days * BucketsPerDay
+	series := newSeries(start, bucketCount)
+
+	pipe := s.client.Pipeline()
+	fetches := make([]*redis.StringCmd, 0, days)
+	for dayIndex := 0; dayIndex < days; dayIndex++ {
+		day := start.Add(time.Duration(dayIndex) * 24 * time.Hour)
+		fetches = append(fetches, pipe.Get(ctx, EnvDayKey(s.prefix, envUUID, day)))
+	}
+
+	if len(fetches) == 0 {
+		return series, nil
+	}
+
+	if _, err := pipe.Exec(ctx); err != nil && !errors.Is(err, redis.Nil) {
+		return EnvSeries{}, err
+	}
+
+	for dayIndex, cmd := range fetches {
+		blob, err := cmd.Bytes()
+		if err != nil && !errors.Is(err, redis.Nil) {
+			return EnvSeries{}, err
+		}
+		if len(blob) == 0 {
+			continue
+		}
+
+		fillSeries(&series, dayIndex*BucketsPerDay, decodeDay(blob))
+	}
+
+	return series, nil
+}
+
+func newSeries(start time.Time, bucketCount int) NodeTileSeries {
+	return NodeTileSeries{
+		Start:         start,
+		BucketSeconds: BucketSeconds,
+		Enroll:        make([]uint16, bucketCount),
+		Config:        make([]uint16, bucketCount),
+		Status:        make([]uint16, bucketCount),
+		Result:        make([]uint16, bucketCount),
+		QueryRead:     make([]uint16, bucketCount),
+		QueryWrite:    make([]uint16, bucketCount),
+		Total:         make([]uint16, bucketCount),
+	}
+}
+
+func fillSeries(series *NodeTileSeries, base int, decoded [EventTypeCount][BucketsPerDay]uint16) {
+	for hour := 0; hour < BucketsPerDay; hour++ {
+		idx := base + hour
+		series.Enroll[idx] = decoded[EventEnroll][hour]
+		series.Config[idx] = decoded[EventConfig][hour]
+		series.Status[idx] = decoded[EventStatus][hour]
+		series.Result[idx] = decoded[EventResult][hour]
+		series.QueryRead[idx] = decoded[EventQueryRead][hour]
+		series.QueryWrite[idx] = decoded[EventQueryWrite][hour]
+		series.Total[idx] = saturatingSum(
+			decoded[EventEnroll][hour],
+			decoded[EventConfig][hour],
+			decoded[EventStatus][hour],
+			decoded[EventResult][hour],
+			decoded[EventQueryRead][hour],
+			decoded[EventQueryWrite][hour],
+		)
+	}
+}
+
 func decodeDay(blob []byte) [EventTypeCount][BucketsPerDay]uint16 {
 	var out [EventTypeCount][BucketsPerDay]uint16
 
diff --git a/pkg/activity/redis_test.go b/pkg/activity/redis_test.go
index 3c01ffdf..55489d23 100644
--- a/pkg/activity/redis_test.go
+++ b/pkg/activity/redis_test.go
@@ -24,6 +24,12 @@ func TestDayKeyUsesEnvNodeAndUTCDate(t *testing.T) {
 	if got := dayStart(day); !got.Equal(wantDayStart) {
 		t.Fatalf("expected UTC day start %s, got %s", wantDayStart, got)
 	}
+
+	gotEnv := EnvDayKey("nodeact:v1", "ENV1", day)
+	wantEnv := "nodeact:v1:env:ENV1:20260615"
+	if gotEnv != wantEnv {
+		t.Fatalf("expected env key %q, got %q", wantEnv, gotEnv)
+	}
 }
 
 func TestStoreIncrementManyAndReadSeries(t *testing.T) {
@@ -89,6 +95,12 @@ func TestStoreIncrementManyAndReadSeries(t *testing.T) {
 	if got := fake.expireFor("nodeact:v1:ENV1:NODE1:20260615"); got != 24*time.Hour {
 		t.Fatalf("expected 24h TTL for 20260615 key, got %s", got)
 	}
+	if got := fake.expireFor("nodeact:v1:env:ENV1:20260614"); got != 24*time.Hour {
+		t.Fatalf("expected 24h TTL for env 20260614 key, got %s", got)
+	}
+	if got := fake.expireFor("nodeact:v1:env:ENV1:20260615"); got != 24*time.Hour {
+		t.Fatalf("expected 24h TTL for env 20260615 key, got %s", got)
+	}
 
 	empty := out["NODE2"]
 	if len(empty.Total) != 48 {
@@ -100,3 +112,55 @@ func TestStoreIncrementManyAndReadSeries(t *testing.T) {
 		}
 	}
 }
+
+func TestStoreReadEnvSeries(t *testing.T) {
+	client, fake := newTestRedisClient(t)
+	store := NewRedisStore(client, "nodeact:v1", 7, 24*time.Hour)
+
+	ctx := context.Background()
+	end := time.Date(2026, 6, 15, 23, 50, 0, 0, time.UTC)
+
+	err := store.IncrementMany(ctx, []Event{
+		{EnvUUID: "ENV1", NodeUUID: "NODE1", Type: EventStatus, At: time.Date(2026, 6, 15, 11, 20, 0, 0, time.UTC), Count: 2},
+		{EnvUUID: "ENV1", NodeUUID: "NODE2", Type: EventStatus, At: time.Date(2026, 6, 15, 11, 40, 0, 0, time.UTC), Count: 1},
+		{EnvUUID: "ENV1", NodeUUID: "NODE2", Type: EventQueryRead, At: time.Date(2026, 6, 15, 12, 5, 0, 0, time.UTC), Count: 4},
+		{EnvUUID: "ENV1", NodeUUID: "NODE3", Type: EventEnroll, At: time.Date(2026, 6, 15, 12, 10, 0, 0, time.UTC), Count: 1},
+		{EnvUUID: "ENV2", NodeUUID: "NODE9", Type: EventResult, At: time.Date(2026, 6, 15, 12, 10, 0, 0, time.UTC), Count: 7},
+	})
+	if err != nil {
+		t.Fatalf("increment failed: %v", err)
+	}
+
+	series, err := store.ReadEnvSeries(ctx, "ENV1", end, 1)
+	if err != nil {
+		t.Fatalf("read env series failed: %v", err)
+	}
+
+	if len(series.Total) != 24 {
+		t.Fatalf("expected 24 buckets, got %d", len(series.Total))
+	}
+
+	wantStart := time.Date(2026, 6, 15, 0, 0, 0, 0, time.UTC)
+	if !series.Start.Equal(wantStart) {
+		t.Fatalf("expected start %s, got %s", wantStart, series.Start)
+	}
+
+	if series.Status[11] != 3 {
+		t.Fatalf("expected env status bucket 11 to be 3, got %d", series.Status[11])
+	}
+	if series.QueryRead[12] != 4 {
+		t.Fatalf("expected env query-read bucket 12 to be 4, got %d", series.QueryRead[12])
+	}
+	if series.Enroll[12] != 1 {
+		t.Fatalf("expected env enroll bucket 12 to be 1, got %d", series.Enroll[12])
+	}
+	if series.Total[11] != 3 || series.Total[12] != 5 {
+		t.Fatalf("unexpected env totals bucket11=%d bucket12=%d", series.Total[11], series.Total[12])
+	}
+	if series.Result[12] != 0 {
+		t.Fatalf("expected ENV2 result data not to leak into ENV1, got %d", series.Result[12])
+	}
+	if got := fake.expireFor("nodeact:v1:env:ENV1:20260615"); got != 24*time.Hour {
+		t.Fatalf("expected env key TTL to be 24h, got %s", got)
+	}
+}
diff --git a/pkg/activity/types.go b/pkg/activity/types.go
index 1a66a52a..e2c26b26 100644
--- a/pkg/activity/types.go
+++ b/pkg/activity/types.go
@@ -49,11 +49,19 @@ type NodeTileSeries struct {
 	Total         []uint16  `json:"total"`
 }
 
+// EnvSeries is a dense activity series ready for environment-level graphs.
+type EnvSeries = NodeTileSeries
+
 // DayKey returns the Redis key for one node's UTC activity day blob.
 func DayKey(prefix, envUUID, nodeUUID string, day time.Time) string {
 	return fmt.Sprintf("%s:%s:%s:%s", prefix, envUUID, nodeUUID, day.UTC().Format("20060102"))
 }
 
+// EnvDayKey returns the Redis key for one environment's UTC activity day blob.
+func EnvDayKey(prefix, envUUID string, day time.Time) string {
+	return fmt.Sprintf("%s:env:%s:%s", prefix, envUUID, day.UTC().Format("20060102"))
+}
+
 func bucketHour(t time.Time) int {
 	return t.UTC().Hour()
 }