Update and refactor core functionality

- Update common package utilities
- Refactor network code for better error handling
- Remove deprecated files and functionality
- Enhance blacklist and filtering capabilities
- Improve snapshot handling and processing

common/linkList/linkList.go

@@ -10,8 +10,15 @@ import (
 
 type LinkList []url.URL
 
-func (l *LinkList) Value() (driver.Value, error) {
-	return json.Marshal(l)
+func (l LinkList) Value() (driver.Value, error) {
+	if len(l) == 0 {
+		return nil, nil
+	}
+	data, err := json.Marshal(l)
+	if err != nil {
+		return nil, err
+	}
+	return data, nil
 }
 
 func (l *LinkList) Scan(value interface{}) error {
@@ -19,7 +26,7 @@ func (l *LinkList) Scan(value interface{}) error {
 		*l = nil
 		return nil
 	}
-	b, ok := value.([]byte) // Type assertion! Converts to []byte
+	b, ok := value.([]byte)
 	if !ok {
 		return fmt.Errorf("failed to scan LinkList: expected []byte, got %T", value)
 	}