Merge pull request 'fixed' (#13) from testbranch into main

Reviewed-on: #13

timetracker.Server/Program.cs

@@ -133,6 +133,67 @@ using (var scope = app.Services.CreateScope())
 {
     var factory = scope.ServiceProvider.GetRequiredService<IDbContextFactory<TimetrackerDbContext>>();
     await using var db = await factory.CreateDbContextAsync();
+    
+    if (dbProvider.Equals("PostgreSQL", StringComparison.OrdinalIgnoreCase))
+    {
+        try
+        {
+            var conn = db.Database.GetDbConnection();
+            if (conn.State != System.Data.ConnectionState.Open)
+            {
+                await conn.OpenAsync();
+            }
+
+            // Check if AppSettings table already exists
+            using (var cmdCheck = conn.CreateCommand())
+            {
+                cmdCheck.CommandText = "SELECT EXISTS (SELECT FROM pg_tables WHERE schemaname = 'public' AND tablename = 'AppSettings');";
+                var appSettingsExists = (bool)(await cmdCheck.ExecuteScalarAsync() ?? false);
+
+                if (appSettingsExists)
+                {
+                    // Ensure __EFMigrationsHistory table exists
+                    using (var cmdCreateHistory = conn.CreateCommand())
+                    {
+                        cmdCreateHistory.CommandText = @"
+                            CREATE TABLE IF NOT EXISTS ""__EFMigrationsHistory"" (
+                                ""MigrationId"" character varying(150) NOT NULL,
+                                ""ProductVersion"" character varying(32) NOT NULL,
+                                CONSTRAINT ""PK___EFMigrationsHistory"" PRIMARY KEY (""MigrationId"")
+                            );";
+                        await cmdCreateHistory.ExecuteNonQueryAsync();
+                    }
+
+                    // Check if the initial migration is already recorded
+                    using (var cmdCheckHistory = conn.CreateCommand())
+                    {
+                        cmdCheckHistory.CommandText = @"SELECT COUNT(*) FROM ""__EFMigrationsHistory"" WHERE ""MigrationId"" = '20260520133634_Initial';";
+                        var historyCount = Convert.ToInt32(await cmdCheckHistory.ExecuteScalarAsync() ?? 0);
+
+                        if (historyCount == 0)
+                        {
+                            // Seed the history table with the migrations that were already created by EnsureCreated in older versions
+                            using (var cmdInsertHistory = conn.CreateCommand())
+                            {
+                                cmdInsertHistory.CommandText = @"
+                                    INSERT INTO ""__EFMigrationsHistory"" (""MigrationId"", ""ProductVersion"") VALUES
+                                    ('20260520133634_Initial', '10.0.9'),
+                                    ('20260520200000_AddPublicHolidays', '10.0.9'),
+                                    ('20260522081459_AddMultiUser', '10.0.9'),
+                                    ('20260607213215_AddFlexTimeAndHolidayState', '10.0.9');";
+                                await cmdInsertHistory.ExecuteNonQueryAsync();
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine($"Fehler beim Vorbereiten der PostgreSQL Migrationshistorie: {ex.Message}");
+        }
+    }
+
     await db.Database.MigrateAsync();
 }