fix(spend): apply report window to OpenCodex cache misses

Author: Yuxin-Qiao

Sources/CodexBarCore/Vendored/OpenCodexUsage/OpenCodexUsageStore.swift

@@ -63,7 +63,10 @@ public struct OpenCodexUsageStore: Sendable {
             return $0.requestID < $1.requestID
         }
         self.replaceCachedEntries(deduped, identity: identity)
-        return deduped
+        // Keep the full lifetime log in the cache, but mirror the cache-hit query when
+        // returning parsed entries so report misses never materialize unbounded history.
+        guard let since else { return deduped }
+        return deduped.filter { $0.timestamp >= since }
     }
 
     private func readCachedEntries(identity: String, since: Date?) -> [OpenCodexUsageEntry]? {

Tests/CodexBarTests/OpenCodexUsageStoreWindowTests.swift

@@ -31,6 +31,31 @@ struct OpenCodexUsageStoreWindowTests {
 
         #expect(cached.isEmpty)
     }
+
+    @Test
+    func `cache miss applies report window while preserving cached history`() throws {
+        let fixture = StoreCacheFixture()
+        try fixture.prepare()
+        defer { fixture.cleanup() }
+        let store = OpenCodexUsageStore(cacheRoot: fixture.cacheRoot)
+        let old = Date(timeIntervalSince1970: 1_784_179_200)
+        let now = old.addingTimeInterval(86400)
+        let oldMillis = Int(old.timeIntervalSince1970 * 1000)
+        let nowMillis = Int(now.timeIntervalSince1970 * 1000)
+        try """
+        {"requestId":"old","timestamp":\(oldMillis),"provider":"openai","model":"gpt-5.4",\
+        "usageStatus":"reported"}
+        {"requestId":"new","timestamp":\(nowMillis),"provider":"openai","model":"gpt-5.4",\
+        "usageStatus":"reported"}
+        """.write(to: fixture.logURL, atomically: true, encoding: .utf8)
+
+        let windowed = try store.loadEntries(logURL: fixture.logURL, since: now)
+
+        #expect(windowed.map(\.requestID) == ["new"])
+
+        let fullCache = try store.loadEntries(logURL: fixture.logURL)
+        #expect(fullCache.map(\.requestID) == ["old", "new"])
+    }
 }
 
 private struct StoreCacheFixture {