filter

type Config struct {
	// AllowedFields is a map of allowed field names to their types
	// If empty, all fields are allowed
	AllowedFields map[string]string // "field_name" -> "string", "int", "time", etc.
	// FieldMapping maps query parameter names to database column names
	// If empty, field names are used as-is
	FieldMapping map[string]string
	// CustomValidators allows custom validation for specific fields
	CustomValidators map[string]func(value string) error
}

type Filter struct {
	Field    string
	Operator Operator
	Value    interface{}
}

type Operator string