From 9a81fa5e844c92c2430a927c100b3c4742280232 Mon Sep 17 00:00:00 2001
From: shinchan-zhai <zhai@vergex.trade>
Date: Mon, 23 Mar 2026 09:54:31 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20news=20seen=20map=20eviction=20strategy?=
 =?UTF-8?q?=20=E2=80=94=20keep=20half=20instead=20of=20clearing=20all?=
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Previously when the seen map exceeded 1000 entries, ALL entries were
deleted, losing dedup state and causing re-notifications. Now evicts
~half the entries, preserving recent URLs for dedup continuity.
---
 agent/brain.go | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/agent/brain.go b/agent/brain.go
index 373da3c7..fd5fd70c 100644
--- a/agent/brain.go
+++ b/agent/brain.go
@@ -105,7 +105,15 @@ func (b *Brain) scanNews(seen map[string]bool) {
 			emoji, d.Title, d.Source, sentiment))
 	}
 
-	if len(seen) > 1000 { for k := range seen { delete(seen, k) } }
+	// Evict ~half when seen map gets large (keep recent half to avoid re-notifying)
+	if len(seen) > 1000 {
+		i, half := 0, len(seen)/2
+		for k := range seen {
+			if i >= half { break }
+			delete(seen, k)
+			i++
+		}
+	}
 }
 
 func (b *Brain) StartMarketBriefs(hours []int) {