fix: BUG-06 — convert naive Pi timestamps to TZ-aware before upload so Postgres TIMESTAMPTZ stores correct instant

modules/app_upload.py

@@ -38,6 +38,7 @@ import hashlib
 import json
 import os
 import time
+from datetime import datetime
 from threading import Thread
 
 import requests
@@ -139,6 +140,24 @@ def _hash_dashcam_file(abs_path, rel_path):
     return sha256
 
 
+def _to_tz_aware(dt_str):
+    """Convert a naive datetime string (from SQLite) to a timezone-aware ISO
+    string the server's TIMESTAMPTZ column will interpret correctly.
+
+    SQLite stores naive local-time strings like '2026-08-10 19:27:30.123456'.
+    Without a timezone, Postgres interprets these as UTC, shifting displayed
+    times by the local offset.  This helper attaches the Pi's local IANA
+    offset so the server stores and displays the correct local time.
+    """
+    try:
+        dt = datetime.fromisoformat(str(dt_str))
+    except (TypeError, ValueError):
+        return dt_str  # unparseable — send as-is and let the server reject it
+    if dt.tzinfo is not None:
+        return dt_str  # already TZ-aware — nothing to do
+    return dt.astimezone().isoformat()
+
+
 def _upload_tracking_batch():
     """Send up to TRACKING_BATCH_SIZE not-yet-uploaded rows. Returns count sent.
 
@@ -159,7 +178,7 @@ def _upload_tracking_batch():
 
     points = [
         {
-            "recorded_at": row["datetime"],
+            "recorded_at": _to_tz_aware(row["datetime"]),
             "gps_lat": row["gpsx"],
             "gps_lon": row["gpsy"],
             "speed": row["speed"],