fix(stats): filter zero-token models

Avoid showing models in dashboard stats when a session recorded no
actual token usage, while still keeping the rest of the session
counts intact.

Co-Authored-By: chatgpt-codex-connector[bot] <199175422+chatgpt-codex-connector[bot]@users.noreply.github.com>

Author: Vrtak-CZ

packages/server/src/services/stats.test.ts

@@ -225,4 +225,44 @@ describe("scanStats", () => {
 		const second = await runEffect(scanStats(registry));
 		expect(second.inputTokens).toBe(999);
 	});
+
+	test("filters models with zero total tokens from stats", async () => {
+		const registry = new PluginRegistry();
+		const zeroUsageSession = makeSession("s1", "project-1", isoDaysAgo(0), "gpt-5", 0, 0);
+		const [, assistantTurn] = zeroUsageSession.turns;
+		if (assistantTurn?.kind === "assistant" && assistantTurn.usage) {
+			assistantTurn.usage.cacheReadTokens = 0;
+			assistantTurn.usage.cacheCreationTokens = 0;
+		}
+
+		const countedSession = makeSession("s2", "project-1", isoDaysAgo(0), "claude-opus", 10, 5);
+
+		const list: SessionSummary[] = [
+			{
+				sessionId: "s1",
+				timestamp: zeroUsageSession.turns[0]?.timestamp ?? "",
+				slug: "s1",
+				firstMessage: "session 1",
+				model: "gpt-5",
+				gitBranch: "main",
+			},
+			{
+				sessionId: "s2",
+				timestamp: countedSession.turns[0]?.timestamp ?? "",
+				slug: "s2",
+				firstMessage: "session 2",
+				model: "claude-opus",
+				gitBranch: "main",
+			},
+		];
+
+		registry.register(createMockPlugin({ s1: zeroUsageSession, s2: countedSession }, list), testConfig);
+
+		const stats = await runEffect(scanStats(registry));
+		expect(stats.sessions).toBe(2);
+		expect(stats.messages).toBe(4);
+		expect(stats.toolCalls).toBe(2);
+		expect(stats.models["gpt-5"]).toBeUndefined();
+		expect(stats.models["claude-opus"]?.inputTokens).toBe(10);
+	});
 });

packages/server/src/services/stats.ts

@@ -152,6 +152,10 @@ function applyUsageStats(stats: DashboardStats, modelUsage: ModelTokenUsage, usa
 	modelUsage.cacheCreationTokens += usage.cacheCreationTokens ?? 0;
 }
 
+function totalUsageTokens(usage: TokenUsage): number {
+	return usage.inputTokens + usage.outputTokens + (usage.cacheReadTokens ?? 0) + (usage.cacheCreationTokens ?? 0);
+}
+
 function applyTurnStats(stats: DashboardStats, turns: Turn[], fallbackModel: string): void {
 	stats.messages += countVisibleMessages(turns);
 
@@ -161,11 +165,11 @@ function applyTurnStats(stats: DashboardStats, turns: Turn[], fallbackModel: str
 		}
 
 		stats.toolCalls += turn.contentBlocks.filter((block) => block.type === "tool_call").length;
-		const modelUsage = ensureModelUsage(stats.models, turn.model || fallbackModel || "unknown");
-
-		if (!turn.usage) {
+		if (!turn.usage || totalUsageTokens(turn.usage) <= 0) {
 			continue;
 		}
+
+		const modelUsage = ensureModelUsage(stats.models, turn.model || fallbackModel || "unknown");
 		applyUsageStats(stats, modelUsage, turn.usage);
 	}
 }