AppDbUpdater: Actually check foreign key violations after updating

Elwig/Helpers/AppDbUpdater.cs

@@ -79,8 +79,13 @@ namespace Elwig.Helpers {
             foreach (var script in toExecute) {
                 await AppDbContext.ExecuteEmbeddedScript(cnx, asm, script);
             }
+            var violations = await AppDbContext.ForeignKeyCheck(cnx);
+            if (violations.Length > 0) {
+                throw new Exception($"Foreign key violations ({violations.Length}):\n" + string.Join("\n", violations
+                    .Select(v => $"{v.Table} - {v.RowId} - {v.Parent} - {v.FkId}")));
+            }
+
             await AppDbContext.ExecuteBatch(cnx, $"""
-                PRAGMA foreign_key_check;
                 COMMIT;
                 PRAGMA foreign_keys = ON;
                 VACUUM;