fix: optimize summary count query and refine row keys for external api logs

backend/test_external_api_log.py

@@ -625,13 +625,13 @@ def test_route_summary_hours_window(session):
 
     # hours=1 → only recent
     result = get_external_api_log_summary(
-        slow_ms=None, hours=1, limit=50, db=session, _=None,
+        slow_ms=None, hours=1, limit=50, offset=0, db=session, _=None,
     )
     assert len(result) == 1 and result[0].path == "/recent"
 
     # hours=72 → both
     result = get_external_api_log_summary(
-        slow_ms=None, hours=72, limit=50, db=session, _=None,
+        slow_ms=None, hours=72, limit=50, offset=0, db=session, _=None,
     )
     assert len(result) == 2
 
@@ -648,7 +648,7 @@ def test_route_summary_limit(session):
     session.commit()
 
     result = get_external_api_log_summary(
-        slow_ms=None, hours=24, limit=3, db=session, _=None,
+        slow_ms=None, hours=24, limit=3, offset=0, db=session, _=None,
     )
     assert len(result) == 3
 
@@ -670,8 +670,94 @@ def test_route_summary_slow_threshold(session):
     session.commit()
 
     result = get_external_api_log_summary(
-        slow_ms=1000, hours=24, limit=50, db=session, _=None,
+        slow_ms=1000, hours=24, limit=50, offset=0, db=session, _=None,
     )
     slow_paths = [r for r in result if r.slow_count > 0]
     assert len(slow_paths) == 1
     assert slow_paths[0].path == "/slow"
+
+
+def test_route_summary_offset_pagination(session):
+    """get_external_api_log_summary respects offset parameter."""
+    from app.routers.external_api_logs import get_external_api_log_summary
+
+    now = datetime.now(timezone.utc)
+    for i in range(10):
+        session.add(ExternalApiLog(direction="upstream", target_type="upstream",
+            method="GET", path=f"/path-{i}", url_host="h",
+            status_code=200, success=True, duration_ms=50 + i, created_at=now))
+    session.commit()
+
+    # Page 1: first 4
+    page1 = get_external_api_log_summary(
+        slow_ms=None, hours=24, limit=4, offset=0, db=session, _=None,
+    )
+    assert len(page1) == 4
+    assert page1[0].path == "/path-9"  # sorted by sum(duration_ms) desc
+
+    # Page 2: next 4
+    page2 = get_external_api_log_summary(
+        slow_ms=None, hours=24, limit=4, offset=4, db=session, _=None,
+    )
+    assert len(page2) == 4
+    assert page2[0].path == "/path-5"
+
+    # Page 3: last 2
+    page3 = get_external_api_log_summary(
+        slow_ms=None, hours=24, limit=4, offset=8, db=session, _=None,
+    )
+    assert len(page3) == 2
+
+    # Beyond end
+    page4 = get_external_api_log_summary(
+        slow_ms=None, hours=24, limit=4, offset=20, db=session, _=None,
+    )
+    assert len(page4) == 0
+
+
+def test_route_summary_count(session):
+    """count_external_api_log_summary returns group count, not raw row count."""
+    from app.routers.external_api_logs import count_external_api_log_summary
+
+    now = datetime.now(timezone.utc)
+    # 3 calls to same path (should be 1 group)
+    for i in range(3):
+        session.add(ExternalApiLog(direction="upstream", target_type="upstream",
+            method="GET", path="/grouped", url_host="h",
+            status_code=200, success=True, duration_ms=100, created_at=now))
+    # 2 calls to different path (another group)
+    for i in range(2):
+        session.add(ExternalApiLog(direction="upstream", target_type="upstream",
+            method="POST", path="/other", url_host="h",
+            status_code=201, success=True, duration_ms=200, created_at=now))
+    session.commit()
+
+    # Should be 2 groups, not 5 raw rows
+    result = count_external_api_log_summary(
+        slow_ms=None, hours=24, db=session, _=None,
+    )
+    assert result == {"total": 2}
+
+
+def test_route_summary_count_respects_hours(session):
+    """count_external_api_log_summary respects hours filter."""
+    from app.routers.external_api_logs import count_external_api_log_summary
+
+    now = datetime.now(timezone.utc)
+    session.add(ExternalApiLog(direction="upstream", target_type="upstream",
+        method="GET", path="/recent", url_host="h",
+        status_code=200, success=True, duration_ms=50,
+        created_at=now - timedelta(minutes=30)))
+    session.add(ExternalApiLog(direction="upstream", target_type="upstream",
+        method="GET", path="/old", url_host="h",
+        status_code=200, success=True, duration_ms=50,
+        created_at=now - timedelta(hours=48)))
+    session.commit()
+
+    # hours=1 → 1 group
+    r1 = count_external_api_log_summary(slow_ms=None, hours=1, db=session, _=None)
+    assert r1 == {"total": 1}
+
+    # hours=72 → 2 groups
+    r2 = count_external_api_log_summary(slow_ms=None, hours=72, db=session, _=None)
+    assert r2 == {"total": 2}