diff --git a/backend/data_layer/activity_session_metrics.py b/backend/data_layer/activity_session_metrics.py
index de54f40..6e3de0e 100644
--- a/backend/data_layer/activity_session_metrics.py
+++ b/backend/data_layer/activity_session_metrics.py
@@ -11,10 +11,21 @@ from typing import Any, Dict, List, Mapping, Optional, Sequence
 
 logger = logging.getLogger(__name__)
 
-# activity_log-Spalten (ohne Kernfelder aus CSV-Minimal-Insert), die über source_field beschrieben werden können.
+# activity_log-Spalten, die per training_parameters.source_field aus CSV (Parameter-Key) befüllt werden dürfen.
+# Muss mit sync_column_backed_session_metrics übereinstimmen (inkl. Kernmetriken wie hr_avg).
 ACTIVITY_LOG_PATCHABLE_COLUMNS = frozenset(
     {
+        "start_time",
+        "end_time",
+        "activity_type",
+        "duration_min",
+        "kcal_active",
+        "kcal_resting",
+        "hr_avg",
+        "hr_max",
         "hr_min",
+        "distance_km",
+        "rpe",
         "pace_min_per_km",
         "cadence",
         "avg_power",
@@ -23,11 +34,24 @@ ACTIVITY_LOG_PATCHABLE_COLUMNS = frozenset(
         "humidity_percent",
         "avg_hr_percent",
         "kcal_per_km",
-        "rpe",
         "notes",
     }
 )
 
+# Diese Spalten nicht aus CSV-Parameter-Zuordnung überschreiben (kommen aus Typ-Mapping / System).
+ACTIVITY_LOG_PATCH_FORBIDDEN = frozenset(
+    {
+        "id",
+        "profile_id",
+        "date",
+        "created",
+        "training_type_id",
+        "training_category",
+        "training_subcategory",
+        "source",
+    }
+)
+
 
 class ActivitySessionMetricsError(Exception):
     """Raised by Layer 1; routers map to HTTP (404/400)."""
@@ -218,8 +242,14 @@ def _coerce_raw_value_for_parameter(data_type: str, raw: Any) -> Any:
     if data_type == "integer":
         if isinstance(raw, bool):
             raise TypeError("boolean nicht als integer erlaubt")
+        if isinstance(raw, str):
+            s = raw.strip().replace(",", ".")
+            return int(round(float(s)))
         return int(round(float(raw)))
     if data_type == "float":
+        if isinstance(raw, str):
+            s = raw.strip().replace(",", ".")
+            return float(s)
         return float(raw)
     if data_type == "string":
         return str(raw) if raw is not None else ""
@@ -248,7 +278,9 @@ def resolve_activity_log_column_patch_from_csv(
     patch: Dict[str, Any] = {}
     for spec in schema:
         src_col = (spec.get("source_field") or "").strip()
-        if not src_col or src_col not in ACTIVITY_LOG_PATCHABLE_COLUMNS:
+        if not src_col or src_col in ACTIVITY_LOG_PATCH_FORBIDDEN:
+            continue
+        if src_col not in ACTIVITY_LOG_PATCHABLE_COLUMNS:
             continue
         pkey = spec["key"]
         if pkey not in mapped:
diff --git a/frontend/src/pages/ActivityPage.jsx b/frontend/src/pages/ActivityPage.jsx
index a53a58f..c38283e 100644
--- a/frontend/src/pages/ActivityPage.jsx
+++ b/frontend/src/pages/ActivityPage.jsx
@@ -118,13 +118,18 @@ function buildMetricsPayload(schema, draft) {
   return out
 }
 
-function SessionMetricsFields({ schema, values, setValues }) {
-  if (!schema || schema.length === 0) return null
+function SessionMetricsFields({ schema, values, setValues, metrics }) {
+  const schemaList = Array.isArray(schema) ? schema : []
+  const metricRows = Array.isArray(metrics) ? metrics : []
+  const schemaKeys = new Set(schemaList.map((s) => s.key))
+  const orphanMetrics = metricRows.filter((row) => row && row.key && !schemaKeys.has(row.key))
+
+  if (schemaList.length === 0 && orphanMetrics.length === 0) return null
   const set = (k, v) => setValues((prev) => ({ ...prev, [k]: v }))
   return (
     <div style={{ marginTop: 12, paddingTop: 12, borderTop: '1px solid var(--border)' }}>
       <div style={{ fontSize: 13, fontWeight: 600, marginBottom: 8 }}>Weitere Kennwerte (Profil)</div>
-      {schema.map((s) => (
+      {schemaList.map((s) => (
         <div key={s.key} className="form-row">
           <label className="form-label">
             {s.name_de}
@@ -157,6 +162,44 @@ function SessionMetricsFields({ schema, values, setValues }) {
           <span className="form-unit" />
         </div>
       ))}
+      {orphanMetrics.length > 0 && (
+        <div style={{ marginTop: 14 }}>
+          <div style={{ fontSize: 12, color: 'var(--text3)', marginBottom: 8, lineHeight: 1.45 }}>
+            Werte aus Import/älteren Daten, die zum <strong>aktuellen</strong> Trainingsprofil dieser Session (Kategorie/Typ
+            in activity_log) nicht ins Schema passen — nur Anzeige. Sichtbar nach erneutem Laden, wenn die Daten in der
+            Datenbank stehen.
+          </div>
+          {orphanMetrics.map((row) => {
+            const disp =
+              values[row.key] === null || values[row.key] === undefined || values[row.key] === ''
+                ? '—'
+                : String(values[row.key])
+            return (
+              <div key={row.key} className="form-row">
+                <label className="form-label">
+                  {row.key}
+                  {row.unit ? ` (${row.unit})` : ''}
+                </label>
+                {row.data_type === 'boolean' ? (
+                  <input type="checkbox" style={{ width: 'auto', marginRight: 'auto' }} checked={!!values[row.key]} readOnly disabled />
+                ) : (
+                  <div
+                    className="form-input"
+                    style={{
+                      background: 'var(--surface2)',
+                      cursor: 'default',
+                      color: 'var(--text1)',
+                    }}
+                  >
+                    {disp}
+                  </div>
+                )}
+                <span className="form-unit" />
+              </div>
+            )
+          })}
+        </div>
+      )}
     </div>
   )
 }
@@ -699,6 +742,7 @@ export default function ActivityPage() {
                         )}
                         <SessionMetricsFields
                           schema={sessionDetail?.schema}
+                          metrics={sessionDetail?.metrics}
                           values={metricDraft}
                           setValues={setMetricDraft}
                         />