Add QueryWindow

Elwig/Helpers/AppDbContext.cs

@@ -45,6 +45,8 @@ namespace Elwig.Helpers {
         public DateTime SavedLastWriteTime { get; private set; }
         public bool HasBackendChanged => SavedLastWriteTime != LastWriteTime;
 
+        public static string ConnectionString => $"Data Source=\"{App.Config.DatabaseFile}\"; Foreign Keys=True; Mode=ReadWrite; Cache=Default";
+
         public AppDbContext() {
             if (App.Config.DatabaseLog != null) {
                 try {
@@ -62,7 +64,7 @@ namespace Elwig.Helpers {
         }
 
         protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) {
-            optionsBuilder.UseSqlite($"Data Source=\"{App.Config.DatabaseFile}\"; Foreign Keys=True; Mode=ReadWrite; Cache=Default");
+            optionsBuilder.UseSqlite(ConnectionString);
             optionsBuilder.UseLazyLoadingProxies();
             optionsBuilder.LogTo(Log, LogLevel.Information);
             base.OnConfiguring(optionsBuilder);