validation

type APIKeyValidator struct {
	Required  bool
	MinLength int
	MaxLength int
}

type IntervalValidator struct {
	Required    bool
	MinDuration int // in minutes
	MaxDuration int // in minutes
}

type LimitValidator struct {
	Required bool
	Min      int
	Max      int
}

type PeriodValidator struct {
	Required bool
}

type URLValidator struct {
	Required bool
	Schemes  []string // allowed schemes (http, https)
}

type ValidationError struct {
	Field   string
	Message string
}

type Validator interface {
	Validate(value interface{}) error
}