Refine Telegram alert behavior

tests/unit/test_regime_quadrant_alert.py

@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from app.services.alert_service import _classify_quadrant
+from app.services.alert_service import _classify_quadrant, _parse_quadrant_log_key, _quadrant_log_key
 
 
 # Quadrant ids: 1=① hot&brittle (regime low, warning high), 2=② transition
@@ -43,3 +43,10 @@ def test_boundary_sitting_does_not_flip():
     # A point parked exactly on both dividers keeps whatever quadrant it had.
     for q in ("1", "2", "3", "4"):
         assert _classify_quadrant(40, 60, prev=q) == q
+
+
+def test_quadrant_log_key_keeps_previous_values():
+    key = _quadrant_log_key("3", 32.4, 54.6)
+    assert _parse_quadrant_log_key(key) == ("3", 32.4, 54.6)
+    # Existing pre-value keys still parse so old installs do not need migration.
+    assert _parse_quadrant_log_key("3") == ("3", None, None)