thread-master/backend/internal/library/placement/recency.go

package placement

import "time"

const (
	MaxPostAgeDays      = 30
	IdealMaxPostAgeDays = 7
	WebSearchMaxAgeDays = 14

	// MinRecencyCandidatesPerTag triggers wider recency windows when a keyword finds fewer posts.
	MinRecencyCandidatesPerTag = 1
	// MaxRecencyCascadeQueries caps extra Search API calls per patrol run.
	MaxRecencyCascadeQueries = 10
)

// RecencyCascadeDays is the patrol recency ladder: nearest window first, then shift older.
func RecencyCascadeDays() []int {
	return []int{IdealMaxPostAgeDays, WebSearchMaxAgeDays, MaxPostAgeDays}
}

func FormatAfterDate(maxAgeDays int, now time.Time) string {
	if now.IsZero() {
		now = time.Now()
	}
	date := now.AddDate(0, 0, -maxAgeDays).UTC()
	return date.Format("2006-01-02")
}

func FormatPublishedAfterISO(maxAgeDays int, now time.Time) string {
	if now.IsZero() {
		now = time.Now()
	}
	date := now.AddDate(0, 0, -maxAgeDays).UTC()
	return date.Format("2006-01-02T15:04:05.000Z")
}