Persist app DB changes directly

docs/critical_import_tool.md

@@ -13,6 +13,8 @@ The tool is intentionally separate from the web application startup path. Critic
 
 The tool currently lives in `src/RolemasterDb.ImportTool` and operates against the same SQLite schema used by the web app.
 
+For the committed app database workflow, the web app forces SQLite `journal_mode=DELETE` during startup so local curation changes land in `src/RolemasterDb.App/rolemaster.db` directly instead of accumulating in a long-lived WAL sidecar.
+
 ## Goals
 
 The importer is designed around the following requirements:

src/RolemasterDb.App/Data/RolemasterDbInitializer.cs

@@ -11,6 +11,7 @@ public static class RolemasterDbInitializer
         await using var dbContext = await dbFactory.CreateDbContextAsync(cancellationToken);
 
         await dbContext.Database.EnsureCreatedAsync(cancellationToken);
+        await EnsureDeleteJournalModeAsync(dbContext, cancellationToken);
         await RolemasterDbSchemaUpgrader.EnsureLatestAsync(dbContext, cancellationToken);
         RolemasterSeedData.BackfillAttackTableMetadata(dbContext);
 
@@ -23,4 +24,18 @@ public static class RolemasterDbInitializer
         RolemasterSeedData.SeedAttackStarterData(dbContext);
         await dbContext.SaveChangesAsync(cancellationToken);
     }
-}
+
+    private static async Task EnsureDeleteJournalModeAsync(RolemasterDbContext dbContext,
+        CancellationToken cancellationToken)
+    {
+        await dbContext.Database.OpenConnectionAsync(cancellationToken);
+        await using var command = dbContext.Database.GetDbConnection().CreateCommand();
+        command.CommandText = "PRAGMA journal_mode=DELETE;";
+
+        var result = await command.ExecuteScalarAsync(cancellationToken);
+        if (!string.Equals(Convert.ToString(result), "delete", StringComparison.OrdinalIgnoreCase))
+        {
+            throw new InvalidOperationException("Failed to configure SQLite journal_mode=DELETE.");
+        }
+    }
+}