danabra.mov
an app to share curated trails
sidetrail.app
atproto
nextjs
react
rsc
tweak ranking
+13
-10
data/queries.ts
+13
-10
data/queries.ts
···
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// Trails List (Home Page)
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// ============================================================================
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-
const HALF_LIFE_HOURS = 24;
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const DECAY_RATE = Math.log(2) / HALF_LIFE_HOURS; // ≈ 0.0289
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const HALF_LIFE_HOURS = 12;
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const DECAY_RATE = Math.log(2) / HALF_LIFE_HOURS; // ≈ 0.0578
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const RECENT_ACTIVITY_WINDOW_HOURS = 3;
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const GRACE_PERIOD_HOURS = 3; // new trails get exposure
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const MIN_ACTIVITY_FOR_RANKING = 5; // need this many to rank in main tier
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export const loadTrails = cache(async function loadTrails(): Promise<TrailCardData[]> {
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const db = getDb();
···
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AND COALESCE(acc.shadowban, 0) = 0
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GROUP BY t.uri, t.cid, t.author_did, t.rkey, t.record, t.created_at, t.indexed_at
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ORDER BY
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-- Tier: trails with activity first (0), then without (1)
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CASE WHEN COUNT(a.trail_uri) > 0 THEN 0 ELSE 1 END,
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-- Score: (1 + sqrt(recent_activity)) * recency_decay
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-- Tier: 0 = grace period (new), 1 = proven (enough activity), 2 = unproven
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CASE
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WHEN COUNT(a.trail_uri) > 0
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THEN (1 + SQRT(SUM(CASE WHEN EXTRACT(EPOCH FROM (NOW() - a.created_at))/3600 < ${RECENT_ACTIVITY_WINDOW_HOURS}::float THEN 1 ELSE 0 END)))
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* EXP(${DECAY_RATE}::float * -1.0 * EXTRACT(EPOCH FROM (NOW() - MAX(a.created_at)))/3600)
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ELSE EXP(${DECAY_RATE}::float * -1.0 * EXTRACT(EPOCH FROM (NOW() - t.created_at))/3600)
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END DESC
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WHEN EXTRACT(EPOCH FROM (NOW() - t.created_at))/3600 < ${GRACE_PERIOD_HOURS}::float THEN 0
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WHEN COUNT(a.trail_uri) >= ${MIN_ACTIVITY_FOR_RANKING} THEN 1
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ELSE 2
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END,
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-- Score within tier: (1 + sqrt(recent_activity)) * recency_decay
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(1 + SQRT(SUM(CASE WHEN EXTRACT(EPOCH FROM (NOW() - a.created_at))/3600 < ${RECENT_ACTIVITY_WINDOW_HOURS}::float THEN 1 ELSE 0 END)))
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* EXP(${DECAY_RATE}::float * -1.0 * EXTRACT(EPOCH FROM (NOW() - GREATEST(t.created_at, COALESCE(MAX(a.created_at), t.created_at))))/3600)
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DESC
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LIMIT 100
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`);
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