server: backfill event.project_info fields from compliance config

The 210-byte waveform record only stores "Project:" — client, operator,
sensor_location, and notes are device-level settings in SUB 1A, not
per-event fields. Backfill those into each event's project_info after
download, same pattern as the sample_rate backfill.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

minimateplus/client.py

@@ -702,8 +702,8 @@ def _decode_compliance_config_into(data: bytes, info: DeviceInfo) -> None:
     # Validated by checking unit strings "in.\0" at label-14 and "/s\0\0" at label-6.
     # "Tran2" at a later position won't match because its surrounding bytes differ.
     try:
-        tran_pos = data.find(b"Tran", 1000)
+        tran_pos = data.find(b"Tran", 44)
-        log.warning("compliance_config: 'Tran' search from 1000 → pos=%d  cfg_len=%d", tran_pos, len(data))
+        log.warning("compliance_config: 'Tran' search from 44 → pos=%d  cfg_len=%d", tran_pos, len(data))
         if tran_pos >= 0:
             pre = data[max(0, tran_pos - 30) : tran_pos + 8]
             log.warning(

sfm/server.py

@@ -323,6 +323,20 @@ def device_events(
             if ev.sample_rate is None:
                 ev.sample_rate = info.compliance_config.sample_rate
 
+    # Backfill event.project_info fields that the 210-byte waveform record doesn't carry.
+    # The waveform record only stores "Project:" — client/operator/sensor_location/notes
+    # live in the SUB 1A compliance config, not in the per-event record.
+    if info.compliance_config:
+        cc = info.compliance_config
+        for ev in events:
+            if ev.project_info is None:
+                ev.project_info = ProjectInfo()
+            pi = ev.project_info
+            if pi.client          is None: pi.client          = cc.client
+            if pi.operator        is None: pi.operator        = cc.operator
+            if pi.sensor_location is None: pi.sensor_location = cc.sensor_location
+            if pi.notes           is None: pi.notes           = cc.notes
+
     return {
         "device":      _serialise_device_info(info),
         "event_count": len(events),