feat: show RDP session duration in Overview and Events (0.5.16)

Add session_duration_sec to EventSummary and a Duration column (HH:MM:SS / Nd HH:MM:SS).

backend/tests/test_session_duration.py

@@ -0,0 +1,20 @@
+"""Tests for session_duration_sec extract/format."""
+
+from app.services.session_duration import extract_session_duration_sec, format_session_duration
+
+
+def test_extract_session_duration_sec():
+    assert extract_session_duration_sec({"session_duration_sec": 18324}) == 18324
+    assert extract_session_duration_sec({"session_duration_sec": "42"}) == 42
+    assert extract_session_duration_sec({"session_duration_sec": ""}) is None
+    assert extract_session_duration_sec({}) is None
+    assert extract_session_duration_sec(None) is None
+    assert extract_session_duration_sec({"session_duration_sec": -1}) is None
+
+
+def test_format_session_duration():
+    assert format_session_duration(0) == "00:00:00"
+    assert format_session_duration(18324) == "05:05:24"
+    assert format_session_duration(2428) == "00:40:28"
+    assert format_session_duration(86400 + 85) == "1д 00:01:25"
+    assert format_session_duration(2 * 86400 + 3661) == "2д 01:01:01"