fix(settings): normalize API token timestamps (#5599)

* fix(settings): normalize API token timestamps

* refactor(api-token): share timestamp threshold

---------

Co-authored-by: Tomilla <5007859+Tomilla@users.noreply.github.com>

internal/database/api_token_timestamp_test.go

@@ -0,0 +1,49 @@
+package database
+
+import (
+	"testing"
+
+	"github.com/mhsanaei/3x-ui/v3/internal/database/model"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+func TestNormalizeApiTokenCreatedAtSeconds(t *testing.T) {
+	originalDB := db
+	t.Cleanup(func() { db = originalDB })
+
+	var err error
+	db, err = gorm.Open(sqlite.Open(":memory:"), &gorm.Config{Logger: logger.Discard})
+	if err != nil {
+		t.Fatalf("open sqlite: %v", err)
+	}
+	if err := db.AutoMigrate(&model.ApiToken{}); err != nil {
+		t.Fatalf("migrate api_tokens: %v", err)
+	}
+
+	rows := []model.ApiToken{
+		{Name: "seconds", Token: "a", CreatedAt: 1_782_485_394},
+		{Name: "milliseconds", Token: "b", CreatedAt: 1_782_485_394_270},
+	}
+	if err := db.Create(&rows).Error; err != nil {
+		t.Fatalf("seed api tokens: %v", err)
+	}
+
+	if err := normalizeApiTokenCreatedAtSeconds(); err != nil {
+		t.Fatalf("normalize timestamps: %v", err)
+	}
+	if err := normalizeApiTokenCreatedAtSeconds(); err != nil {
+		t.Fatalf("normalize timestamps again: %v", err)
+	}
+
+	var got []model.ApiToken
+	if err := db.Order("id asc").Find(&got).Error; err != nil {
+		t.Fatalf("read api tokens: %v", err)
+	}
+	for _, row := range got {
+		if row.CreatedAt != 1_782_485_394 {
+			t.Fatalf("%s created_at = %d, want seconds", row.Name, row.CreatedAt)
+		}
+	}
+}