feat(event): add SQLite outbound event store

channel-service/tests/test_event_store.py

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+import os
+import tempfile
+
+import pytest
+
+from app.models.event import EventType, OutboundEvent
+from app.repositories.event_store import EventStore
+
+
+@pytest.fixture
+def store():
+    fd, path = tempfile.mkstemp(suffix=".db")
+    os.close(fd)
+    store = EventStore(path)
+    yield store
+    os.unlink(path)
+
+
+def test_save_and_fetch_pending(store):
+    event = OutboundEvent(
+        event_type=EventType.HEARTBEAT,
+        account_id="bot-001",
+        tenant_code="rescue",
+        data={"online_status": "online"},
+    )
+    store.save(event)
+    pending = store.fetch_pending(limit=10)
+    assert len(pending) == 1
+    assert pending[0].event_id == event.event_id
+
+
+def test_mark_delivered(store):
+    event = OutboundEvent(
+        event_type=EventType.HEARTBEAT,
+        account_id="bot-001",
+        tenant_code="rescue",
+        data={},
+    )
+    store.save(event)
+    store.mark_delivered(event.event_id)
+    pending = store.fetch_pending(limit=10)
+    assert len(pending) == 0