Fix: division by zero in stats (#324)

internal/storage/postgres/stats.go

@@ -121,10 +121,10 @@ func (s Stats) Change24hBlockStats(ctx context.Context) (response storage.Change
 		With("s", second).
 		TableExpr("f, s").
 		ColumnExpr(`
-			(f.tx_count - s.tx_count)/s.tx_count as tx_count_24h,
-			(f.bytes_in_block - s.bytes_in_block)/s.bytes_in_block as bytes_in_block_24h,
-			(f.blobs_size - s.blobs_size)/s.blobs_size as blobs_size_24h,
-			(f.fee - s.fee)/s.fee as fee_24h
+			case when s.tx_count > 0 then (f.tx_count - s.tx_count)/s.tx_count when f.tx_count > 0 then 1 else 0 end as tx_count_24h,
+			case when s.bytes_in_block > 0 then (f.bytes_in_block - s.bytes_in_block)/s.bytes_in_block when f.bytes_in_block > 0 then 1 else 0 end as bytes_in_block_24h,
+			case when s.blobs_size > 0 then (f.blobs_size - s.blobs_size)/s.blobs_size when f.blobs_size > 0 then 1 else 0 end as blobs_size_24h,
+			case when s.fee > 0 then (f.fee - s.fee)/s.fee when f.fee > 0 then 1 else 0 end as fee_24h
 		`).
 		Scan(ctx, &response)
 	return

internal/storage/postgres/stats_test.go

@@ -305,6 +305,18 @@ func (s *StatsTestSuite) TestMessagesCount24h() {
 	s.Require().Len(items, 0)
 }
 
+func (s *StatsTestSuite) TestChange24hBlockStats() {
+	ctx, ctxCancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer ctxCancel()
+
+	stats, err := s.storage.Stats.Change24hBlockStats(ctx)
+	s.Require().NoError(err)
+	s.Require().Equal(stats.BlobsSize, 0.0)
+	s.Require().Equal(stats.BytesInBlock, 0.0)
+	s.Require().Equal(stats.Fee, 0.0)
+	s.Require().Equal(stats.TxCount, 0.0)
+}
+
 func TestSuiteStats_Run(t *testing.T) {
 	suite.Run(t, new(StatsTestSuite))
 }