diff --git a/src/main/java/com/andrewlalis/perfin/control/EditAccountController.java b/src/main/java/com/andrewlalis/perfin/control/EditAccountController.java
index 2d97e97..d0761f7 100644
--- a/src/main/java/com/andrewlalis/perfin/control/EditAccountController.java
+++ b/src/main/java/com/andrewlalis/perfin/control/EditAccountController.java
@@ -58,7 +58,6 @@ public class EditAccountController implements RouteSelectionListener {
         var numberValid = new ValidationApplier<>(new PredicateValidator<String>()
                 .addTerminalPredicate(s -> s != null && !s.isBlank(), "Account number should not be empty.")
                 .addPredicate(s -> s.length() <= 255, "Account number is too long.")
-                .addPredicate(s -> s.matches("\\d+"), "Account number should contain only numeric digits.")
         ).attachToTextField(accountNumberField);
 
         var balanceValid = new ValidationApplier<>(
diff --git a/src/main/java/com/andrewlalis/perfin/data/impl/JdbcAnalyticsRepository.java b/src/main/java/com/andrewlalis/perfin/data/impl/JdbcAnalyticsRepository.java
index 0bb65c4..108888a 100644
--- a/src/main/java/com/andrewlalis/perfin/data/impl/JdbcAnalyticsRepository.java
+++ b/src/main/java/com/andrewlalis/perfin/data/impl/JdbcAnalyticsRepository.java
@@ -45,7 +45,17 @@ public record JdbcAnalyticsRepository(Connection conn) implements AnalyticsRepos
                 FROM transaction
                 LEFT JOIN transaction_vendor tv ON tv.id = transaction.vendor_id
                 LEFT JOIN account_entry ae ON ae.transaction_id = transaction.id
-                WHERE transaction.currency = ? AND ae.type = 'CREDIT' AND transaction.timestamp >= ? AND transaction.timestamp <= ?
+                WHERE
+                    transaction.currency = ? AND
+                    transaction.timestamp >= ? AND
+                    transaction.timestamp <= ? AND
+                    ae.type = 'CREDIT' AND
+                    '!exclude' NOT IN (
+                        SELECT tt.name
+                        FROM transaction_tag tt
+                        LEFT JOIN transaction_tag_join ttj ON tt.id = ttj.tag_id
+                        WHERE ttj.transaction_id = transaction.id
+                    )
                 GROUP BY tv.id
                 ORDER BY total DESC""",
                 List.of(currency.getCurrencyCode(), range.start(), range.end()),
@@ -75,7 +85,17 @@ public record JdbcAnalyticsRepository(Connection conn) implements AnalyticsRepos
                 FROM transaction
                 LEFT JOIN transaction_category tc ON tc.id = transaction.category_id
                 LEFT JOIN account_entry ae ON ae.transaction_id = transaction.id
-                WHERE transaction.currency = ? AND ae.type = ? AND transaction.timestamp >= ? AND transaction.timestamp <= ?
+                WHERE
+                    transaction.currency = ? AND
+                    ae.type = ? AND
+                    transaction.timestamp >= ? AND
+                    transaction.timestamp <= ? AND
+                    '!exclude' NOT IN (
+                        SELECT tt.name
+                        FROM transaction_tag tt
+                        LEFT JOIN transaction_tag_join ttj ON tt.id = ttj.tag_id
+                        WHERE ttj.transaction_id = transaction.id
+                    )
                 GROUP BY tc.id
                 ORDER BY total DESC;""",
                 List.of(currency.getCurrencyCode(), type.name(), range.start(), range.end()),
diff --git a/src/main/java/com/andrewlalis/perfin/view/component/module/PieChartModule.java b/src/main/java/com/andrewlalis/perfin/view/component/module/PieChartModule.java
index babc4cb..20fe260 100644
--- a/src/main/java/com/andrewlalis/perfin/view/component/module/PieChartModule.java
+++ b/src/main/java/com/andrewlalis/perfin/view/component/module/PieChartModule.java
@@ -11,10 +11,7 @@ import javafx.scene.control.ChoiceBox;
 import javafx.scene.layout.Pane;
 import javafx.scene.paint.Color;
 
-import java.util.ArrayList;
-import java.util.Comparator;
-import java.util.Currency;
-import java.util.List;
+import java.util.*;
 import java.util.concurrent.CompletableFuture;
 
 /**
@@ -39,7 +36,11 @@ public abstract class PieChartModule extends DashboardModule {
         this.getChildren().add(chart);
         currencyChoiceBox.valueProperty().addListener((observable, oldValue, newValue) -> {
             if (newValue != null) {
-                getChartData(newValue).thenAccept(data -> Platform.runLater(() -> {
+                getChartData(newValue).exceptionally(throwable -> {
+                    throwable.printStackTrace(System.err);
+                    return Collections.emptyList();
+                })
+                .thenAccept(data -> Platform.runLater(() -> {
                     chartData.setAll(data);
                     if (!dataColors.isEmpty()) {
                         for (int i = 0; i < dataColors.size(); i++) {
diff --git a/src/main/resources/help-pages/adding-a-transaction.fxml b/src/main/resources/help-pages/adding-a-transaction.fxml
index 0df9dde..6069ad8 100644
--- a/src/main/resources/help-pages/adding-a-transaction.fxml
+++ b/src/main/resources/help-pages/adding-a-transaction.fxml
@@ -65,6 +65,10 @@
         and earnings. With **tags**, you can add custom text tags to your
         transaction, sort of like social media's "hashtag" phenomenon.
         --
+        **Pro-tip**: You can add the tag `!exclude` to a transaction to exclude
+        it from analytics and visuals. This is useful for things like transfers
+        between your accounts.
+        --
         **Line items** can be used to specify in more detail what was bought or sold
         in a transaction. For example, you bought a new computer and some
         accessories at an electronics store. You can record the exact purchase