src/main/java/com/andrewlalis/perfin/control/AccountViewController.java

@@ -89,6 +89,7 @@ public class AccountViewController implements RouteSelectionListener {
     @FXML
     public void archiveAccount() {
         boolean confirmResult = Popups.confirm(
+                titleLabel,
                 "Are you sure you want to archive this account? It will no " +
                         "longer show up in the app normally, and you won't be " +
                         "able to add new transactions to it. You'll still be " +
@@ -103,6 +104,7 @@ public class AccountViewController implements RouteSelectionListener {
 
     @FXML public void unarchiveAccount() {
         boolean confirm = Popups.confirm(
+                titleLabel,
                 "Are you sure you want to restore this account from its archived " +
                         "status?"
         );
@@ -115,6 +117,7 @@ public class AccountViewController implements RouteSelectionListener {
     @FXML
     public void deleteAccount() {
         boolean confirm = Popups.confirm(
+                titleLabel,
                 "Are you sure you want to permanently delete this account and " +
                         "all data directly associated with it? This cannot be " +
                         "undone; deleted accounts are not recoverable at all. " +

src/main/java/com/andrewlalis/perfin/control/BalanceRecordViewController.java

@@ -48,7 +48,10 @@ public class BalanceRecordViewController implements RouteSelectionListener {
     }
 
     @FXML public void delete() {
-        boolean confirm = Popups.confirm("Are you sure you want to delete this balance record? This may have an effect on the derived balance of your account, as shown in Perfin.");
+        boolean confirm = Popups.confirm(
+                titleLabel,
+                "Are you sure you want to delete this balance record? This may have an effect on the derived balance of your account, as shown in Perfin."
+        );
         if (confirm) {
             Profile.getCurrent().dataSource().useRepo(BalanceRecordRepository.class, repo -> repo.deleteById(balanceRecord.id));
             router.navigateBackAndClear();

src/main/java/com/andrewlalis/perfin/control/CreateBalanceRecordController.java

@@ -89,7 +89,7 @@ public class CreateBalanceRecordController implements RouteSelectionListener {
         LocalDateTime localTimestamp = LocalDateTime.parse(timestampField.getText(), DateUtil.DEFAULT_DATETIME_FORMAT);
         BigDecimal reportedBalance = new BigDecimal(balanceField.getText());
 
-        boolean confirm = Popups.confirm("Are you sure that you want to record the balance of account\n%s\nas %s,\nas of %s?".formatted(
+        boolean confirm = Popups.confirm(timestampField, "Are you sure that you want to record the balance of account\n%s\nas %s,\nas of %s?".formatted(
                 account.getShortName(),
                 CurrencyUtil.formatMoneyWithCurrencyPrefix(new MoneyValue(reportedBalance, account.getCurrency())),
                 localTimestamp.atZone(ZoneId.systemDefault()).format(DateUtil.DEFAULT_DATETIME_FORMAT_WITH_ZONE)
@@ -122,7 +122,7 @@ public class CreateBalanceRecordController implements RouteSelectionListener {
                     CurrencyUtil.formatMoney(new MoneyValue(reportedBalance, account.getCurrency())),
                     CurrencyUtil.formatMoney(new MoneyValue(currentDerivedBalance, account.getCurrency()))
             );
-            return Popups.confirm(msg);
+            return Popups.confirm(timestampField, msg);
         }
         return true;
     }

src/main/java/com/andrewlalis/perfin/control/EditAccountController.java

@@ -117,7 +117,7 @@ public class EditAccountController implements RouteSelectionListener {
                 BigDecimal initialBalance = new BigDecimal(initialBalanceField.getText().strip());
                 List<Path> attachments = Collections.emptyList();
 
-                boolean success = Popups.confirm("Are you sure you want to create this account?");
+                boolean success = Popups.confirm(accountNameField, "Are you sure you want to create this account?");
                 if (success) {
                     long id = accountRepo.insert(type, number, name, currency);
                     balanceRepo.insert(LocalDateTime.now(ZoneOffset.UTC), id, initialBalance, currency, attachments);
@@ -138,7 +138,7 @@ public class EditAccountController implements RouteSelectionListener {
             }
         } catch (Exception e) {
             log.error("Failed to save (or update) account " + account.id, e);
-            Popups.error("Failed to save the account: " + e.getMessage());
+            Popups.error(accountNameField, "Failed to save the account: " + e.getMessage());
         }
     }
 

src/main/java/com/andrewlalis/perfin/control/EditTransactionController.java

@@ -203,7 +203,7 @@ public class EditTransactionController implements RouteSelectionListener {
                 });
             } catch (Exception e) {
                 log.error("Failed to get repositories.", e);
-                Popups.error("Failed to fetch account-specific data: " + e.getMessage());
+                Popups.error(container, "Failed to fetch account-specific data: " + e.getMessage());
             }
         });
     }

src/main/java/com/andrewlalis/perfin/control/Popups.java

@@ -1,30 +1,65 @@
 package com.andrewlalis.perfin.control;
 
+import javafx.scene.Node;
+import javafx.scene.Scene;
 import javafx.scene.control.Alert;
 import javafx.scene.control.ButtonType;
 import javafx.stage.Modality;
+import javafx.stage.Window;
 
 /**
  * Helper class for standardized popups and confirmation dialogs for the app.
  */
 public class Popups {
-    public static boolean confirm(String text) {
+    public static boolean confirm(Window owner, String text) {
         Alert alert = new Alert(Alert.AlertType.CONFIRMATION, text);
+        alert.initOwner(owner);
         alert.initModality(Modality.APPLICATION_MODAL);
         var result = alert.showAndWait();
         return result.isPresent() && result.get() == ButtonType.OK;
     }
 
-    public static void message(String text) {
+    public static boolean confirm(Node node, String text) {
+        return confirm(getWindowFromNode(node), text);
+    }
+
+    public static void message(Window owner, String text) {
         Alert alert = new Alert(Alert.AlertType.NONE, text);
+        alert.initOwner(owner);
         alert.initModality(Modality.APPLICATION_MODAL);
         alert.getButtonTypes().setAll(ButtonType.OK);
         alert.showAndWait();
     }
 
-    public static void error(String text) {
+    public static void message(Node node, String text) {
+        message(getWindowFromNode(node), text);
+    }
+
+    public static void error(Window owner, String text) {
         Alert alert = new Alert(Alert.AlertType.WARNING, text);
+        alert.initOwner(owner);
         alert.initModality(Modality.APPLICATION_MODAL);
         alert.showAndWait();
     }
+
+    public static void error(Node node, String text) {
+        error(getWindowFromNode(node), text);
+    }
+
+    public static void error(Window owner, Exception e) {
+        error(owner, "An " + e.getClass().getSimpleName() + " occurred: " + e.getMessage());
+    }
+
+    public static void error(Node node, Exception e) {
+        error(getWindowFromNode(node), e);
+    }
+
+    private static Window getWindowFromNode(Node n) {
+        Window owner = null;
+        Scene scene = n.getScene();
+        if (scene != null) {
+            owner = scene.getWindow();
+        }
+        return owner;
+    }
 }

src/main/java/com/andrewlalis/perfin/control/ProfilesViewController.java

@@ -46,10 +46,10 @@ public class ProfilesViewController {
         String name = newProfileNameField.getText();
         boolean valid = Profile.validateName(name);
         if (valid && !ProfileLoader.getAvailableProfiles().contains(name)) {
-            boolean confirm = Popups.confirm("Are you sure you want to add a new profile named \"" + name + "\"?");
+            boolean confirm = Popups.confirm(profilesVBox, "Are you sure you want to add a new profile named \"" + name + "\"?");
             if (confirm) {
                 if (openProfile(name, false)) {
-                    Popups.message("Created new profile \"" + name + "\" and loaded it.");
+                    Popups.message(profilesVBox, "Created new profile \"" + name + "\" and loaded it.");
                 }
                 newProfileNameField.clear();
             }
@@ -108,18 +108,18 @@ public class ProfilesViewController {
             PerfinApp.profileLoader.load(name);
             ProfilesStage.closeView();
             router.replace("accounts");
-            if (showPopup) Popups.message("The profile \"" + name + "\" has been loaded.");
+            if (showPopup) Popups.message(profilesVBox, "The profile \"" + name + "\" has been loaded.");
             return true;
         } catch (ProfileLoadException e) {
-            Popups.error("Failed to load the profile: " + e.getMessage());
+            Popups.error(profilesVBox, "Failed to load the profile: " + e.getMessage());
             return false;
         }
     }
 
     private void deleteProfile(String name) {
-        boolean confirmA = Popups.confirm("Are you sure you want to delete the profile \"" + name + "\"? This will permanently delete ALL accounts, transactions, files, and other data for this profile, and it cannot be recovered.");
+        boolean confirmA = Popups.confirm(profilesVBox, "Are you sure you want to delete the profile \"" + name + "\"? This will permanently delete ALL accounts, transactions, files, and other data for this profile, and it cannot be recovered.");
         if (confirmA) {
-            boolean confirmB = Popups.confirm("Press \"OK\" to confirm that you really want to delete the profile \"" + name + "\". There's no going back.");
+            boolean confirmB = Popups.confirm(profilesVBox, "Press \"OK\" to confirm that you really want to delete the profile \"" + name + "\". There's no going back.");
             if (confirmB) {
                 try {
                     FileUtil.deleteDirRecursive(Profile.getDir(name));

src/main/java/com/andrewlalis/perfin/control/TransactionViewController.java

@@ -72,6 +72,7 @@ public class TransactionViewController {
 
     @FXML public void deleteTransaction() {
         boolean confirm = Popups.confirm(
+            titleLabel,
             "Are you sure you want to delete this transaction? This will " +
             "permanently remove the transaction and its effects on any linked " +
             "accounts, as well as remove any attachments from storage within " +

src/main/java/com/andrewlalis/perfin/control/TransactionsViewController.java

@@ -177,7 +177,7 @@ public class TransactionsViewController implements RouteSelectionListener {
                     ));
                 }
             } catch (Exception e) {
-                Popups.error("An error occurred: " + e.getMessage());
+                Popups.error(transactionsListBorderPane, e);
             }
         }
     }

src/main/java/com/andrewlalis/perfin/model/Profile.java

@@ -28,6 +28,10 @@ import java.util.function.Consumer;
  *     class maintains a static <em>current</em> profile that can be loaded and
  *     unloaded.
  * </p>
+ *
+ * @param name The name of the profile.
+ * @param settings The profile's settings.
+ * @param dataSource The profile's data source.
  */
 public record Profile(String name, Properties settings, DataSource dataSource) {
     private static final Logger log = LoggerFactory.getLogger(Profile.class);
@@ -65,6 +69,7 @@ public record Profile(String name, Properties settings, DataSource dataSource) {
             }
         }
         currentProfileListeners.removeIf(ref -> ref.get() == null);
+        log.debug("Current profile set to {}.", current.name());
     }
 
     public static void whenLoaded(Consumer<Profile> consumer) {

src/main/java/com/andrewlalis/perfin/model/ProfileLoader.java

@@ -1,6 +1,7 @@
 package com.andrewlalis.perfin.model;
 
 import com.andrewlalis.perfin.PerfinApp;
+import com.andrewlalis.perfin.control.Popups;
 import com.andrewlalis.perfin.data.DataSourceFactory;
 import com.andrewlalis.perfin.data.ProfileLoadException;
 import com.andrewlalis.perfin.data.util.FileUtil;
@@ -43,6 +44,21 @@ public class ProfileLoader {
         } catch (IOException e) {
             throw new ProfileLoadException("Failed to load profile settings.", e);
         }
+        try {
+            DataSourceFactory.SchemaStatus status = dataSourceFactory.getSchemaStatus(name);
+            if (status == DataSourceFactory.SchemaStatus.NEEDS_MIGRATION) {
+                boolean confirm = Popups.confirm(window, "The profile \"" + name + "\" has an outdated data schema and needs to be migrated to the latest version. Is this okay?");
+                if (!confirm) {
+                    throw new ProfileLoadException("User rejected migration.");
+                }
+            } else if (status == DataSourceFactory.SchemaStatus.INCOMPATIBLE) {
+                Popups.error(window, "The profile \"" + name + "\" has a data schema that's incompatible with this app.");
+                throw new ProfileLoadException("Incompatible schema version.");
+            }
+        } catch (IOException e) {
+            throw new ProfileLoadException("Failed to get profile's schema status.", e);
+        }
+        Popups.message(window, "Test!");
         return new Profile(name, settings, dataSourceFactory.getDataSource(name));
     }
 

src/main/java/com/andrewlalis/perfin/view/StartupSplashScreen.java

@@ -9,6 +9,7 @@ import javafx.stage.Stage;
 import javafx.stage.StageStyle;
 
 import java.util.List;
+import java.util.concurrent.CompletableFuture;
 import java.util.function.Consumer;
 
 /**
@@ -60,6 +61,10 @@ public class StartupSplashScreen extends Stage implements Consumer<String> {
         return scene;
     }
 
+    /**
+     * Runs all tasks sequentially, invoking each one on the JavaFX main thread,
+     * and quitting if there's any exception thrown.
+     */
     private void runTasks() {
         Thread.ofVirtual().start(() -> {
             try {
@@ -69,7 +74,16 @@ public class StartupSplashScreen extends Stage implements Consumer<String> {
             }
             for (var task : tasks) {
                 try {
-                    task.accept(this);
+                    CompletableFuture<Void> future = new CompletableFuture<>();
+                    Platform.runLater(() -> {
+                        try {
+                            task.accept(this);
+                            future.complete(null);
+                        } catch (Exception e) {
+                            future.completeExceptionally(e);
+                        }
+                    });
+                    future.join();
                     Thread.sleep(500);
                 } catch (Exception e) {
                     accept("Startup failed: " + e.getMessage());