Count views and evict server copies by retention criteria before LRU

server/p2p-db.js

@@ -234,3 +234,27 @@ export async function p2pStats() {
     heldCids: await one("SELECT COUNT(DISTINCT cid) FROM p2p_holders WHERE status = 'active'"),
   };
 }
+
+// ---- retention (plan 010) -------------------------------------------------------
+// Server copies in the order they should be evicted when the cache needs room:
+// first the ones that are neither "top" (≥ keepMinViews views in keepDays) nor
+// "recent" (played within keepRecentDays) — fewest views, then oldest — and
+// only then the qualifying ones, least recently played first.
+export async function listMediaEvictionOrder({ now, keepMinViews, keepDays, keepRecentDays }) {
+  const r = await db.execute({
+    sql: `SELECT m.video_id, m.size, m.last_access,
+                 COALESCE((SELECT SUM(v.n) FROM video_views v
+                            WHERE v.video_id = m.video_id AND v.day >= ?), 0) AS views
+            FROM media_cache m WHERE m.status = 'ready'`,
+    args: [dayKey(now - keepDays * 86400_000)],
+  });
+  const recentCut = now - keepRecentDays * 86400_000;
+  const rows = rowsOf(r).map((x) => ({
+    ...x, views: Number(x.views) || 0,
+    qualifies: (Number(x.views) || 0) >= keepMinViews || Number(x.last_access) >= recentCut,
+  }));
+  rows.sort((a, b) => (a.qualifies - b.qualifies)
+    || (a.qualifies ? 0 : a.views - b.views)
+    || (a.last_access - b.last_access));
+  return rows;
+}