fix: conserve local-day activity evidence

src/fenris/collector.py

@@ -239,8 +239,8 @@ def write_sample(
             percentage_used, available_spare, media_errors, power_on_hours,
             power_cycles, unsafe_shutdowns, temperature_c,
             data_units_written, data_units_read, bytes_written, bytes_read,
-            critical_warning, segment_id
-        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+            critical_warning, segment_id, local_tz
+        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
         """,
         (
             sample["ts"],
@@ -263,6 +263,7 @@ def write_sample(
             sample["bytes_read"],
             sample["critical_warning"],
             segment_id,
+            sample.get("local_tz"),
         ),
     )
     
@@ -272,6 +273,7 @@ def write_sample(
         "identity_key": identity_key,
         "identity_degraded": identity_degraded,
         "segment_id": segment_id,
+        "sample_id": cursor.lastrowid,
     }
 
 
@@ -291,12 +293,12 @@ def _publish_observation(
 ) -> None:
     """Publish one staged sample and all dependent evidence in caller transaction."""
     observed_at = _observation_time(sample)
+    sample["local_tz"] = tz_name
     validate_sample_invariants(sample, conn)
     ensure_period_open(conn, observed_at)
     seg_info = write_sample(sample, identity, conn, observed_at)
 
-    cursor = conn.execute("SELECT id FROM samples ORDER BY id DESC LIMIT 1")
-    current_id = cursor.fetchone()[0]
+    current_id = seg_info["sample_id"]
     prev = find_previous_sample(conn, seg_info.get("segment_id"), current_id)
     if prev is not None:
         current = {
@@ -308,8 +310,28 @@ def _publish_observation(
             "temperature_c": sample["temperature_c"],
             "data_units_written": sample["data_units_written"],
             "data_units_read": sample["data_units_read"],
+            "local_tz": tz_name,
         }
         derive_hours_from_interval(conn, prev, current)
+        from .local_day import record_local_activity_interval
+        record_local_activity_interval(
+            conn,
+            prev,
+            current,
+            start_sample_id=prev["id"],
+            end_sample_id=current_id,
+            segment_id=seg_info.get("segment_id"),
+        )
+    else:
+        previous_any_segment = find_previous_sample(conn, None, current_id)
+        if previous_any_segment is not None:
+            from .local_day import mark_local_activity_gap
+            mark_local_activity_gap(
+                conn,
+                sample["ts"],
+                tz_name,
+                previous_any_segment,
+            )
 
     from .day_aggregate import derive_all_days, persist_day_aggregate
     for aggregate in derive_all_days(conn):