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FCM v1 fid (Firebase Installation ID) target returns 404 UNREGISTERED on iOS, while the full registration token delivers

Fixes ios registration issue

Steady

signal score

🔗 2

sources · firebase

⏳ Too early

trajectory — needs a few more hourly snapshots

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Why this scored 7

every term, weighted

Velocity+0.3 / 40 max

Engagement per hour, normalized against the fastest item on its own source

Acceleration+0.0 / 25 max

Whether that velocity is itself speeding up, as a per-hour rate

Cross-source spread+3.1 / 25 max

How many independent communities are talking about the same entity

Recency+5.0 / 10 max

Decays to zero over 14 days

Saturation penalty−1.4 / 30 max

Subtracted once something is big and old — we rank what's next, not what's peaked

Composite7.0

Weights are hand-tuned, not learned — we're calibrating them against realized trends as history accumulates. On a topic's first sighting there's no previous reading to compare against, so acceleration starts from a neutral prior rather than a measurement. Full methodology

Signal history

7-day window (free)

Entities

fcmfirebasefirebase cloud messaging

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