diff --git a/model/ability.go b/model/ability.go
index c31fbc69479..d04b3f4dad2 100644
--- a/model/ability.go
+++ b/model/ability.go
@@ -340,19 +340,10 @@ func FixAbility() (int, int, error) {
 	}
 	defer fixLock.Unlock()
 
-	// truncate abilities table
-	if common.UsingMainDatabase(common.DatabaseTypeSQLite) {
-		err := DB.Exec("DELETE FROM abilities").Error
-		if err != nil {
-			common.SysLog(fmt.Sprintf("Delete abilities failed: %s", err.Error()))
-			return 0, 0, err
-		}
-	} else {
-		err := DB.Exec("TRUNCATE TABLE abilities").Error
-		if err != nil {
-			common.SysLog(fmt.Sprintf("Truncate abilities failed: %s", err.Error()))
-			return 0, 0, err
-		}
+	// clear abilities table
+	if err := DB.Session(&gorm.Session{AllowGlobalUpdate: true}).Delete(&Ability{}).Error; err != nil {
+		common.SysLog(fmt.Sprintf("Delete abilities failed: %s", err.Error()))
+		return 0, 0, err
 	}
 	var channels []*Channel
 	// Find all channels
diff --git a/model/ability_invariant_test.go b/model/ability_invariant_test.go
new file mode 100644
index 00000000000..b5b06142f0f
--- /dev/null
+++ b/model/ability_invariant_test.go
@@ -0,0 +1,78 @@
+package model
+
+import (
+	"testing"
+
+	"github.com/QuantumNous/new-api/common"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFixAbilityRebuildsAbilitiesFromChannels(t *testing.T) {
+	truncateTables(t)
+
+	priority := int64(7)
+
+	// Seed a stale ability that FixAbility must remove.
+	require.NoError(t, DB.Create(&Ability{
+		Group:     "stale-group",
+		Model:     "stale-model",
+		ChannelId: 999,
+		Enabled:   true,
+	}).Error)
+
+	// Seed channels that FixAbility should convert into abilities.
+	require.NoError(t, DB.Create(&Channel{
+		Id:       1,
+		Type:     1,
+		Key:      "key-1",
+		Status:   common.ChannelStatusEnabled,
+		Name:     "channel-enabled",
+		Group:    "default,vip",
+		Models:   "gpt-4o,gpt-4.1",
+		Priority: &priority,
+	}).Error)
+
+	require.NoError(t, DB.Create(&Channel{
+		Id:     2,
+		Type:   1,
+		Key:    "key-2",
+		Status: common.ChannelStatusManuallyDisabled,
+		Name:   "channel-disabled",
+		Group:  "default",
+		Models: "claude-3-5-sonnet",
+	}).Error)
+
+	successCount, failCount, err := FixAbility()
+	require.NoError(t, err)
+	assert.Equal(t, 2, successCount)
+	assert.Equal(t, 0, failCount)
+
+	// Stale row must be gone.
+	var staleCount int64
+	require.NoError(t, DB.Model(&Ability{}).
+		Where(&Ability{Group: "stale-group", Model: "stale-model"}).
+		Count(&staleCount).Error)
+	assert.Equal(t, int64(0), staleCount, "stale ability must be cleared by FixAbility")
+
+	// Channel 1 (enabled, 2 groups x 2 models = 4 abilities) must be rebuilt.
+	var ch1Count int64
+	require.NoError(t, DB.Model(&Ability{}).Where("channel_id = ?", 1).Count(&ch1Count).Error)
+	assert.Equal(t, int64(4), ch1Count, "enabled channel must produce group x model ability rows")
+
+	// Channel 1 abilities must be enabled.
+	var ch1Enabled int64
+	require.NoError(t, DB.Model(&Ability{}).
+		Where("channel_id = ? AND enabled = ?", 1, true).Count(&ch1Enabled).Error)
+	assert.Equal(t, int64(4), ch1Enabled)
+
+	// Channel 2 (disabled, 1 group x 1 model = 1 ability) must be rebuilt but disabled.
+	var ch2Count int64
+	require.NoError(t, DB.Model(&Ability{}).Where("channel_id = ?", 2).Count(&ch2Count).Error)
+	assert.Equal(t, int64(1), ch2Count, "disabled channel must still produce an ability row")
+
+	var ch2Enabled int64
+	require.NoError(t, DB.Model(&Ability{}).
+		Where("channel_id = ? AND enabled = ?", 2, false).Count(&ch2Enabled).Error)
+	assert.Equal(t, int64(1), ch2Enabled, "disabled channel ability must have enabled=false")
+}