Remove redundant SQL from SQLite rebuild migration

README.md

@@ -121,6 +121,8 @@ For migration authoring, use the local tool command form:
 dotnet dotnet-ef migrations add <MigrationName> --project RpgRoller/RpgRoller.csproj --startup-project RpgRoller/RpgRoller.csproj
 ```
 
+For SQLite migrations, avoid `migrationBuilder.Sql(...)` in the same migration step that rebuilds a table for schema changes; prefer column defaults or a follow-up migration so EF Core does not warn about raw SQL executing while a rebuilt table is still pending.
+
 ## Frontend Runtime
 
 - Runtime frontend is Blazor Server with interactive components.

RpgRoller.Tests/HostingCoverageTests.cs

@@ -1,6 +1,8 @@
 using Microsoft.Data.Sqlite;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
@@ -203,6 +205,23 @@ public sealed class HostingCoverageTests
         Assert.Equal(1, rolemasterHistoryCount);
     }
 
+    [Fact]
+    public void AuthorizationRolesAndCampaignDeletion_MigrationScript_DoesNotMixUsersSqlIntoCharactersRebuild()
+    {
+        var dbPath = Path.Combine(Path.GetTempPath(), $"rpgroller-migration-script-{Guid.NewGuid():N}.db");
+        var options = new DbContextOptionsBuilder<RpgRollerDbContext>().UseSqlite($"Data Source={dbPath}").Options;
+
+        using var db = new RpgRollerDbContext(options);
+        var migrator = db.GetService<IMigrator>();
+        var script = migrator.GenerateScript(
+            fromMigration: "20260226131003_AddSkillGroupPrototypes",
+            toMigration: "20260226160859_AddAuthorizationRolesAndCampaignDeletion");
+
+        Assert.Contains("""ALTER TABLE "Users" ADD "Roles" TEXT NOT NULL DEFAULT 'admin';""", script);
+        Assert.Contains("""CREATE TABLE "ef_temp_Characters" (""", script);
+        Assert.DoesNotContain("UPDATE Users", script);
+    }
+
     [Fact]
     public void InitializeRpgRollerState_MigratesCopiedDevelopmentDatabaseAndPreservesD6Rolling()
     {

RpgRoller/Migrations/20260226160859_AddAuthorizationRolesAndCampaignDeletion.cs

@@ -26,12 +26,6 @@ namespace RpgRoller.Migrations
                 nullable: true,
                 oldClrType: typeof(Guid),
                 oldType: "TEXT");
-
-            migrationBuilder.Sql("""
-                UPDATE Users
-                SET Roles = 'admin'
-                WHERE Roles IS NULL OR TRIM(Roles) = '';
-                """);
         }
 
         /// <inheritdoc />