fix: convert sleep timestamps from unix to datetime

clusters/homelab/apps/garmin/configmap.yaml

@@ -7,7 +7,7 @@ data:
   sync.py: |
     import os
     import time
-    from datetime import date, timedelta
+    from datetime import date, timedelta, datetime
     import psycopg2
     from garminconnect import Garmin
 
@@ -181,6 +181,13 @@ data:
 
     # ── Daily Health (letzte 7 Tage) ──────────────────────────────────────────
 
+    def ts_to_dt(ts):
+        if ts is None:
+            return None
+        if ts > 1e10:
+            ts = ts / 1000
+        return datetime.fromtimestamp(ts)
+
     def safe_get(fn, *args):
         try:
             return fn(*args)
@@ -233,7 +240,7 @@ data:
     """
 
     synced = 0
-    check_date = today - timedelta(days=365 * 3)
+    check_date = today - timedelta(days=7)
 
     while check_date <= today:
         d = check_date.isoformat()
@@ -288,8 +295,8 @@ data:
             hrv.get("baselineBalancedLower"),
             hrv.get("status"),
             hrv.get("feedbackPhrase"),
-            sleep.get("sleepStartTimestampLocal"),
-            sleep.get("sleepEndTimestampLocal"),
+            ts_to_dt(sleep.get("sleepStartTimestampLocal")),
+            ts_to_dt(sleep.get("sleepEndTimestampLocal")),
             sleep.get("sleepTimeSeconds"),
             sleep.get("napTimeSeconds"),
             sleep.get("deepSleepSeconds"),