temporal

type ValidityWindow struct {
	// ValidFrom is the moment the fact became true (real-world axis).
	ValidFrom time.Time `json:"valid_from"`

	// InvalidAt is the moment the fact stopped being true.
	// Zero value means the fact is still considered valid.
	InvalidAt time.Time `json:"invalid_at,omitempty"`

	// GitCommit is the commit hash that recorded this fact (transaction axis).
	GitCommit string `json:"git_commit,omitempty"`

	// Confidence is the initial confidence score in [0,1].
	// It decays over time via DecayedConfidence.
	Confidence float64 `json:"confidence"`

	// HalfLife controls how fast confidence decays.
	// Zero value falls back to DefaultHalfLife.
	HalfLife time.Duration `json:"half_life,omitempty"`
	// contains filtered or unexported fields
}