fix: continue to debug and fix strt amd waveform weirdness

bridges/ach_server.py

@@ -627,10 +627,13 @@ def _build_waveform_blob(e: Event) -> Optional[str]:
     pv = e.peak_values
     peak_values = None
     if pv:
+        # Key names must match sfm/server.py _serialise_peak_values() so the
+        # waveform viewer (which reads tran_in_s / vert_in_s / long_in_s) works
+        # identically in both live-device mode and DB mode.
         peak_values = {
-            "tran":             pv.tran,
-            "vert":             pv.vert,
-            "long":             pv.long,
+            "tran_in_s":        pv.tran,
+            "vert_in_s":        pv.vert,
+            "long_in_s":        pv.long,
             "micl_psi":         pv.micl,
             "peak_vector_sum":  pv.peak_vector_sum,
         }

minimateplus/client.py

@@ -1366,11 +1366,13 @@ def _decode_a5_waveform(
     cumulative global byte offset; at each new frame, the starting alignment
     within the T,V,L,M cycle is (global_offset % 8).
 
-    Confirmed sizes from 4-2-26 (A5[0..8], skipping A5[7] metadata frame
-    and A5[9] terminator):
+    Confirmed sizes from 4-2-26 blast capture (A5[0..8], metadata at A5[7]):
         Frame 0: 934B  Frame 1: 963B  Frame 2: 946B  Frame 3: 960B
         Frame 4: 952B  Frame 5: 946B  Frame 6: 941B  Frame 8: 992B
     — none are multiples of 8.
+    NOTE: Metadata frame position is variable — at fi==7 for blast events
+    (4-2-26 capture) and fi==6 for desk-thump events (2026-04-14 confirmed).
+    The dynamic b"Project:" detection handles both cases.
 
     ── Modifies event in-place. ─────────────────────────────────────────────────
     """
@@ -1454,9 +1456,14 @@ def _decode_a5_waveform(
                 wave[:24].hex(' '),
             )
 
-        # Frame 7 carries event-time metadata strings ("Project:", "Client:", …)
-        # and no waveform ADC data.
-        elif fi == 7:
+        # Metadata frame: contains "Project:", "Client:", etc. strings.
+        # Originally assumed to be always fi==7 (A5[7] in 4-2-26 blast capture),
+        # but confirmed variable position — it appears at whatever chunk index the
+        # device places it (observed at fi=6 for desk-thump events 2026-04-14).
+        # Skip ANY frame whose raw bytes contain b"Project:" — this is the same
+        # anchor used by stop_after_metadata in read_bulk_waveform_stream.
+        elif b"Project:" in w:
+            log.info("_decode_a5_waveform: fi=%d skipped (metadata frame)", fi)
             continue
 
         # Terminator frames have page_key=0x0000 and are excluded upstream

sfm/server.py

@@ -1028,7 +1028,7 @@ def db_event_waveform(event_id: str) -> dict:
     waveform viewer can consume either source without modification:
       - total_samples, pretrig_samples, rectime_seconds, samples_decoded
       - sample_rate
-      - peak_values  (tran, vert, long, micl_psi, peak_vector_sum)
+      - peak_values  (tran_in_s, vert_in_s, long_in_s, micl_psi, peak_vector_sum)
       - channels     ({"Tran": [...], "Vert": [...], "Long": [...], "Mic": [...]})
 
     Returns 404 if the event doesn't exist, 422 if the event exists but has no

sfm/waveform_viewer.html

@@ -507,11 +507,13 @@
     const micPeakPsi = data.peak_values?.micl_psi ?? null;
     const DBL_REF_PSI = 2.9e-9; // 20 µPa in psi
 
-    // 0C record peak values (device-computed, authoritative) per channel
+    // 0C record peak values (device-computed, authoritative) per channel.
+    // Keys: live-device endpoint uses tran_in_s/vert_in_s/long_in_s;
+    // DB blobs created before 2026-04-14 used tran/vert/long — fall back for compat.
     const peakValues0C = {
-      Tran: data.peak_values?.tran_in_s ?? null,
-      Vert: data.peak_values?.vert_in_s ?? null,
-      Long: data.peak_values?.long_in_s ?? null,
+      Tran: data.peak_values?.tran_in_s ?? data.peak_values?.tran ?? null,
+      Vert: data.peak_values?.vert_in_s ?? data.peak_values?.vert ?? null,
+      Long: data.peak_values?.long_in_s ?? data.peak_values?.long ?? null,
     };
 
     for (const [ch, color] of Object.entries(CHANNEL_COLORS)) {