First commit

tests/unit/test_sse_replay_dedup.py

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+import pytest
+from types import SimpleNamespace
+from agent_framework.sse.events import SSEHub, SSEEvent
+
+
+class MemorySSEStore:
+    def __init__(self):
+        self.rows=[]; self.next_id=1
+    def append_sse_event(self, session_id, event, payload):
+        row={"id": self.next_id, "session_id": session_id, "event_name": event, "payload": payload}
+        self.next_id += 1; self.rows.append(row); return row["id"]
+    def list_sse_events(self, session_id, after_id, limit):
+        return [r for r in self.rows if r["session_id"] == session_id and r["id"] > after_id][:limit]
+
+
+@pytest.mark.asyncio
+async def test_subscribe_skips_live_event_already_replayed():
+    hub = SSEHub(SimpleNamespace(SSE_KEEPALIVE_SECONDS=0.01, SSE_EVENT_REPLAY_LIMIT=100, SQLITE_DB_PATH=':memory:', SESSION_REPOSITORY_PROVIDER='sqlite'), telemetry=None)
+    hub.store = MemorySSEStore()
+    eid = await hub.emit("s1", "message.responded", {"text":"ok"})
+    # Same event remains in live queue and is also in replay store.
+    gen = hub.subscribe("s1", 0)
+    chunks=[]
+    chunks.append(await gen.__anext__())  # replay event
+    chunks.append(await gen.__anext__())  # connected
+    chunks.append(await gen.__anext__())  # keepalive, not duplicated event
+    assert chunks[0].startswith(f"id: {eid}")
+    assert "message.responded" in chunks[0]
+    assert "message.responded" not in chunks[2]
+    await gen.aclose()