fix: support German column names in CSV imports

Problem: Import expected English column names, but German Apple Health/Omron
exports use German names with units.

Fixed:
- Apple Health: Support both English and German column names
  - "Start" OR "Datum/Uhrzeit"
  - "Resting Heart Rate" OR "Ruhepuls (count/min)"
  - "Heart Rate Variability" OR "Herzfrequenzvariabilität (ms)"
  - "VO2 Max" OR "VO2 max (ml/(kg·min))"
  - "Oxygen Saturation" OR "Blutsauerstoffsättigung (%)"
  - "Respiratory Rate" OR "Atemfrequenz (count/min)"

- Omron: Support column names with/without units
  - "Systolisch (mmHg)" OR "Systolisch"
  - "Diastolisch (mmHg)" OR "Diastolisch"
  - "Puls (bpm)" OR "Puls"
  - "Unregelmäßiger Herzschlag festgestellt" OR "Unregelmäßiger Herzschlag"
  - "Mögliches AFib" OR "Vorhofflimmern"

Added debug logging for both imports to show detected columns.

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

backend/routers/blood_pressure.py

@@ -310,8 +310,15 @@ async def import_omron_csv(
     with get_db() as conn:
         cur = get_cursor(conn)
 
+        # Log available columns for debugging
+        first_row = True
+
         for row in reader:
             try:
+                if first_row:
+                    logger.info(f"Omron CSV Columns: {list(row.keys())}")
+                    first_row = False
+
                 # Parse Omron German date format
                 date_str = row.get('Datum', row.get('Date'))
                 time_str = row.get('Zeit', row.get('Time', '08:00'))
@@ -325,18 +332,27 @@ async def import_omron_csv(
                     errors += 1
                     continue
 
-                # Extract measurements
-                systolic = row.get('Systolisch', row.get('Systolic'))
-                diastolic = row.get('Diastolisch', row.get('Diastolic'))
-                pulse = row.get('Puls', row.get('Pulse'))
+                # Extract measurements (support column names with/without units)
+                systolic = (row.get('Systolisch (mmHg)') or row.get('Systolisch') or
+                           row.get('Systolic (mmHg)') or row.get('Systolic'))
+                diastolic = (row.get('Diastolisch (mmHg)') or row.get('Diastolisch') or
+                            row.get('Diastolic (mmHg)') or row.get('Diastolic'))
+                pulse = (row.get('Puls (bpm)') or row.get('Puls') or
+                        row.get('Pulse (bpm)') or row.get('Pulse'))
 
                 if not systolic or not diastolic:
+                    logger.warning(f"Skipped row {date_str} {time_str}: Missing BP values (sys={systolic}, dia={diastolic})")
                     skipped += 1
                     continue
 
-                # Parse warning flags
-                irregular = row.get('Unregelmäßiger Herzschlag', row.get('Irregular Heartbeat', ''))
-                afib = row.get('Vorhofflimmern', row.get('AFib', ''))
+                # Parse warning flags (support various column names)
+                irregular = (row.get('Unregelmäßiger Herzschlag festgestellt') or
+                            row.get('Unregelmäßiger Herzschlag') or
+                            row.get('Irregular Heartbeat') or '')
+                afib = (row.get('Mögliches AFib') or
+                       row.get('Vorhofflimmern') or
+                       row.get('Possible AFib') or
+                       row.get('AFib') or '')
 
                 irregular_heartbeat = irregular.lower() in ['ja', 'yes', 'true', '1']
                 possible_afib = afib.lower() in ['ja', 'yes', 'true', '1']

backend/routers/vitals_baseline.py

@@ -320,18 +320,20 @@ async def import_apple_health_baseline(
                     logger.info(f"CSV Columns: {list(row.keys())}")
                     first_row = False
 
-                date = row.get('Start')[:10] if row.get('Start') else None
+                # Support both English and German column names
+                date_raw = row.get('Start') or row.get('Datum/Uhrzeit')
+                date = date_raw[:10] if date_raw else None
                 if not date:
-                    logger.warning(f"Skipped row (no date): Start='{row.get('Start')}'")
+                    logger.warning(f"Skipped row (no date): Start='{row.get('Start')}', Datum/Uhrzeit='{row.get('Datum/Uhrzeit')}'")
                     skipped += 1
                     continue
 
-                # Extract baseline vitals from Apple Health export
-                rhr = row.get('Resting Heart Rate')
-                hrv = row.get('Heart Rate Variability')
-                vo2 = row.get('VO2 Max')
-                spo2 = row.get('Oxygen Saturation')
-                resp_rate = row.get('Respiratory Rate')
+                # Extract baseline vitals (support English + German column names)
+                rhr = row.get('Resting Heart Rate') or row.get('Ruhepuls (count/min)')
+                hrv = row.get('Heart Rate Variability') or row.get('Herzfrequenzvariabilität (ms)')
+                vo2 = row.get('VO2 Max') or row.get('VO2 max (ml/(kg·min))')
+                spo2 = row.get('Oxygen Saturation') or row.get('Blutsauerstoffsättigung (%)')
+                resp_rate = row.get('Respiratory Rate') or row.get('Atemfrequenz (count/min)')
 
                 # Skip if no baseline vitals
                 if not any([rhr, hrv, vo2, spo2, resp_rate]):