diff --git a/pkg/mining/config_manager.go b/pkg/mining/config_manager.go
index 03c79cb..78acbec 100644
--- a/pkg/mining/config_manager.go
+++ b/pkg/mining/config_manager.go
@@ -2,7 +2,6 @@ package mining
 
 import (
 	"encoding/json"
-	"fmt"
 	"os"
 	"path/filepath"
 	"sync"
@@ -13,7 +12,7 @@ import (
 // configMutex protects concurrent access to config file operations
 var configMutex sync.RWMutex
 
-// MinerAutostartConfig{MinerType: "xmrig", Autostart: true, Config: &cfg}
+// MinerAutostartConfig{MinerType: "xmrig", Autostart: true, Config: &config}
 type MinerAutostartConfig struct {
 	MinerType string  `json:"minerType"`
 	Autostart bool    `json:"autostart"`
@@ -47,16 +46,16 @@ func getMinersConfigPath() (string, error) {
 	return xdg.ConfigFile("lethean-desktop/miners/config.json")
 }
 
-// cfg, err := LoadMinersConfig()
+// configuration, err := LoadMinersConfig()
 // if err != nil { return err }
-// cfg.Database.Enabled = false
+// configuration.Database.Enabled = false
 func LoadMinersConfig() (*MinersConfig, error) {
 	configMutex.RLock()
 	defer configMutex.RUnlock()
 
 	configPath, err := getMinersConfigPath()
 	if err != nil {
-		return nil, fmt.Errorf("could not determine miners config path: %w", err)
+		return nil, ErrInternal("could not determine miners config path").WithCause(err)
 	}
 
 	data, err := os.ReadFile(configPath)
@@ -68,12 +67,12 @@ func LoadMinersConfig() (*MinersConfig, error) {
 				Database: defaultDatabaseConfig(),
 			}, nil
 		}
-		return nil, fmt.Errorf("failed to read miners config file: %w", err)
+		return nil, ErrInternal("failed to read miners config file").WithCause(err)
 	}
 
 	var configuration MinersConfig
 	if err := json.Unmarshal(data, &configuration); err != nil {
-		return nil, fmt.Errorf("failed to unmarshal miners config: %w", err)
+		return nil, ErrInternal("failed to unmarshal miners config").WithCause(err)
 	}
 
 	// Apply default database config if not set (for backwards compatibility)
@@ -84,25 +83,25 @@ func LoadMinersConfig() (*MinersConfig, error) {
 	return &configuration, nil
 }
 
-// cfg.Database.RetentionDays = 60
-// if err := SaveMinersConfig(cfg); err != nil { return err }
+// configuration.Database.RetentionDays = 60
+// if err := SaveMinersConfig(configuration); err != nil { return err }
 func SaveMinersConfig(configuration *MinersConfig) error {
 	configMutex.Lock()
 	defer configMutex.Unlock()
 
 	configPath, err := getMinersConfigPath()
 	if err != nil {
-		return fmt.Errorf("could not determine miners config path: %w", err)
+		return ErrInternal("could not determine miners config path").WithCause(err)
 	}
 
 	dir := filepath.Dir(configPath)
 	if err := os.MkdirAll(dir, 0755); err != nil {
-		return fmt.Errorf("failed to create config directory: %w", err)
+		return ErrInternal("failed to create config directory").WithCause(err)
 	}
 
 	data, err := json.MarshalIndent(configuration, "", "  ")
 	if err != nil {
-		return fmt.Errorf("failed to marshal miners config: %w", err)
+		return ErrInternal("failed to marshal miners config").WithCause(err)
 	}
 
 	return AtomicWriteFile(configPath, data, 0600)
@@ -115,7 +114,7 @@ func UpdateMinersConfig(modifier func(*MinersConfig) error) error {
 
 	configPath, err := getMinersConfigPath()
 	if err != nil {
-		return fmt.Errorf("could not determine miners config path: %w", err)
+		return ErrInternal("could not determine miners config path").WithCause(err)
 	}
 
 	// Load current config
@@ -128,11 +127,11 @@ func UpdateMinersConfig(modifier func(*MinersConfig) error) error {
 				Database: defaultDatabaseConfig(),
 			}
 		} else {
-			return fmt.Errorf("failed to read miners config file: %w", err)
+			return ErrInternal("failed to read miners config file").WithCause(err)
 		}
 	} else {
 		if err := json.Unmarshal(data, &configuration); err != nil {
-			return fmt.Errorf("failed to unmarshal miners config: %w", err)
+			return ErrInternal("failed to unmarshal miners config").WithCause(err)
 		}
 		if configuration.Database.RetentionDays == 0 {
 			configuration.Database = defaultDatabaseConfig()
@@ -147,12 +146,12 @@ func UpdateMinersConfig(modifier func(*MinersConfig) error) error {
 	// Save atomically
 	dir := filepath.Dir(configPath)
 	if err := os.MkdirAll(dir, 0755); err != nil {
-		return fmt.Errorf("failed to create config directory: %w", err)
+		return ErrInternal("failed to create config directory").WithCause(err)
 	}
 
 	newData, err := json.MarshalIndent(configuration, "", "  ")
 	if err != nil {
-		return fmt.Errorf("failed to marshal miners config: %w", err)
+		return ErrInternal("failed to marshal miners config").WithCause(err)
 	}
 
 	return AtomicWriteFile(configPath, newData, 0600)