feat: support for day time monitoring data, combined report generation now compaitible with mixed day and night types.

backend/models.py

@@ -272,6 +272,14 @@ class MonitoringSession(Base):
     duration_seconds = Column(Integer, nullable=True)
     status = Column(String, default="recording")  # recording, completed, failed
 
+    # Human-readable label auto-derived from date/location, editable by user.
+    # e.g. "NRL-1 — Sun 2/23 — Night"
+    session_label = Column(String, nullable=True)
+
+    # Period classification for report stats columns.
+    # weekday_day | weekday_night | weekend_day | weekend_night
+    period_type = Column(String, nullable=True)
+
     # Snapshot of device configuration at recording time
     session_metadata = Column(Text, nullable=True)  # JSON