feat: broadcast

internal/model/broadcast.go

@@ -0,0 +1,40 @@
+package model
+
+import (
+	"encoding/json"
+	"time"
+)
+
+// Broadcast is an announcement shown to every user exactly once.
+//
+// Deliberately not a notification: it creates no tray rows and no per-user
+// records until someone actually dismisses it. The modal is the delivery
+// surface; push and the realtime nudge only tell clients to go look.
+type Broadcast struct {
+	ID    string `json:"id"`
+	Title string `json:"title"`
+	Body  string `json:"body"`
+	// Entities are offset/length formatting spans, the same shape chat uses,
+	// so no HTML is ever stored or rendered.
+	Entities json.RawMessage `json:"entities"`
+	// BannerURL is resolved from the stored R2 key for the client.
+	BannerURL *string `json:"banner_url,omitempty"`
+	CTALabel  *string `json:"cta_label,omitempty"`
+	CTAURL    *string `json:"cta_url,omitempty"`
+
+	PublishedAt *time.Time `json:"published_at,omitempty"`
+	ExpiresAt   *time.Time `json:"expires_at,omitempty"`
+	CreatedAt   time.Time  `json:"created_at"`
+
+	// SeenCount is filled for the admin list only — how many people have
+	// dismissed it so far.
+	SeenCount int64 `json:"seen_count,omitempty"`
+}
+
+// Live reports whether the broadcast is currently deliverable.
+func (b *Broadcast) Live(now time.Time) bool {
+	if b.PublishedAt == nil || b.PublishedAt.After(now) {
+		return false
+	}
+	return b.ExpiresAt == nil || b.ExpiresAt.After(now)
+}