Export/Database: Do not delete import source files

Elwig/Helpers/Export/Database.cs

@@ -212,7 +212,7 @@ namespace Elwig.Helpers.Export {
             }
         }
 
-        public static async Task ImportSqlite(string filename, bool zipFile = false) {
+        public static async Task ImportSqlite(string filename, bool zipFile = false, bool keepSource = true) {
             if (zipFile) {
                 var newName = Path.ChangeExtension(App.Config.DatabaseFile, ".new.sqlite3");
                 try {
@@ -221,7 +221,7 @@ namespace Elwig.Helpers.Export {
                     foreach (var entry in zip.Entries) {
                         if (entry.Name.EndsWith(".sqlite3")) {
                             entry.ExtractToFile(newName);
-                            await ImportSqlite(newName);
+                            await ImportSqlite(newName, keepSource: false);
                             return;
                         }
                     }
@@ -233,7 +233,11 @@ namespace Elwig.Helpers.Export {
 
             var oldName = Path.ChangeExtension(App.Config.DatabaseFile, ".old.sqlite3");
             File.Move(App.Config.DatabaseFile, oldName, true);
+            if (keepSource) {
+                File.Copy(filename, App.Config.DatabaseFile, false);
+            } else {
                 File.Move(filename, App.Config.DatabaseFile, false);
+            }
 
             using var cnx = await AppDbContext.ConnectAsync();
             await cnx.ExecuteBatch("VACUUM");
@@ -246,7 +250,7 @@ namespace Elwig.Helpers.Export {
                 using (var cnx = await AppDbContext.ConnectAsync($"Data Source=\"{newName}\"; Mode=ReadWriteCreate; Foreign Keys=False; Cache=Default; Pooling=False")) {
                     await cnx.ExecuteBatch(await reader.ReadToEndAsync());
                 }
-                await ImportSqlite(newName);
+                await ImportSqlite(newName, keepSource: false);
             } finally {
                 if (File.Exists(newName)) File.Delete(newName);
             }