feat: Refactor activity session metrics handling and enhance activity listing

- Updated the `replace_activity_session_metrics` function to improve validation logic and error handling for required fields.
- Enhanced the activity listing query to order results by date, start time, and ID, ensuring consistent output.
- Modified the frontend to handle null values in metrics payload and improved the display of activity statistics, including total entries in profile and sample size.

backend/data_layer/activity_session_metrics.py

@@ -356,7 +356,7 @@ def replace_activity_session_metrics(
         cur, row.get("training_category"), row.get("training_type_id")
     )
     by_key = {s["key"]: s for s in schema}
-    payload_keys = set()
+    payload_by_key: Dict[str, Dict[str, Any]] = {}
     for item in metrics:
         raw_k = item.get("parameter_key")
         if raw_k is None or not str(raw_k).strip():
@@ -364,11 +364,15 @@ def replace_activity_session_metrics(
         k = str(raw_k).strip()
         if k not in by_key:
             raise ActivitySessionMetricsError(400, f"Unbekannter oder nicht zugewiesener Parameter: {k}")
-        payload_keys.add(k)
+        payload_by_key[k] = item
 
     for s in schema:
-        if s["required"] and s["key"] not in payload_keys:
+        if not s["required"]:
-            raise ActivitySessionMetricsError(400, f"Pflichtfeld fehlt: {s['key']}")
+            continue
+        itk = s["key"]
+        hit = payload_by_key.get(itk)
+        if hit is None or hit.get("value") is None:
+            raise ActivitySessionMetricsError(400, f"Pflichtfeld fehlt: {itk}")
 
     cur.execute(
         "DELETE FROM activity_session_metrics WHERE activity_log_id = %s",
@@ -378,9 +382,14 @@ def replace_activity_session_metrics(
     for item in metrics:
         k = str(item["parameter_key"]).strip()
         spec = by_key[k]
+        val = item.get("value")
+        if val is None:
+            if spec["required"]:
+                raise ActivitySessionMetricsError(400, f"Pflichtfeld fehlt: {k}")
+            continue
         rules = _validation_rules_dict(spec["validation_rules"])
-        _validate_single_value(spec["data_type"], item.get("value"), rules)
+        _validate_single_value(spec["data_type"], val, rules)
-        vn, vi, vt, vb = _row_value_tuple(spec["data_type"], item["value"])
+        vn, vi, vt, vb = _row_value_tuple(spec["data_type"], val)
         cur.execute(
             """
             INSERT INTO activity_session_metrics (

backend/routers/activity.py

@@ -64,7 +64,7 @@ def list_activity(
                 WHERE profile_id=%s
                   {quality_filter}
                   AND date >= (CURRENT_DATE - %s::integer)
-                ORDER BY date DESC, start_time DESC
+                ORDER BY date DESC, start_time DESC NULLS LAST, id DESC
                 LIMIT %s OFFSET %s
                 """,
                 (pid, days, limit, offset),
@@ -75,7 +75,7 @@ def list_activity(
                 SELECT * FROM activity_log
                 WHERE profile_id=%s
                   {quality_filter}
-                ORDER BY date DESC, start_time DESC
+                ORDER BY date DESC, start_time DESC NULLS LAST, id DESC
                 LIMIT %s OFFSET %s
                 """,
                 (pid, limit, offset),
@@ -192,18 +192,30 @@ def activity_stats(
             cur.execute("SELECT * FROM profiles WHERE id=%s", (pid,))
             profile = r2d(cur.fetchone())
             quality_filter = get_quality_filter_sql(profile or {})
+        cur.execute(
+            f"SELECT COUNT(*)::bigint AS c FROM activity_log WHERE profile_id=%s {quality_filter}",
+            (pid,),
+        )
+        total_in_profile = int(cur.fetchone()["c"])
         cur.execute(
             f"""
             SELECT * FROM activity_log
             WHERE profile_id=%s {quality_filter}
-            ORDER BY date DESC
+            ORDER BY date DESC, start_time DESC NULLS LAST, id DESC
             LIMIT 30
             """,
             (pid,),
         )
         rows = [r2d(r) for r in cur.fetchall()]
     if not rows:
-        return {"count": 0, "total_kcal": 0, "total_min": 0, "by_type": {}}
+        return {
+            "count": 0,
+            "sample_size": 0,
+            "total_in_profile": total_in_profile,
+            "total_kcal": 0,
+            "total_min": 0,
+            "by_type": {},
+        }
     total_kcal = sum(float(r.get("kcal_active") or 0) for r in rows)
     total_min = sum(float(r.get("duration_min") or 0) for r in rows)
     by_type = {}
@@ -215,6 +227,8 @@ def activity_stats(
         by_type[t]["min"] += float(r.get("duration_min") or 0)
     return {
         "count": len(rows),
+        "sample_size": len(rows),
+        "total_in_profile": total_in_profile,
         "total_kcal": round(total_kcal),
         "total_min": round(total_min),
         "by_type": by_type,

frontend/src/pages/ActivityPage.jsx

@@ -66,6 +66,7 @@ function buildMetricsPayload(schema, draft) {
     if (s.data_type === 'boolean') {
       if (raw === '' || raw === null || raw === undefined) {
         if (s.required) throw new Error(`Pflichtfeld: ${s.name_de}`)
+        out.push({ parameter_key: s.key, value: null })
         continue
       }
       out.push({ parameter_key: s.key, value: !!raw })
@@ -73,6 +74,7 @@ function buildMetricsPayload(schema, draft) {
     }
     if (raw === '' || raw === null || raw === undefined) {
       if (s.required) throw new Error(`Pflichtfeld: ${s.name_de}`)
+      out.push({ parameter_key: s.key, value: null })
       continue
     }
     let v = raw
@@ -335,7 +337,14 @@ export default function ActivityPage() {
         setListHasMore(false)
         return
       }
-      setEntries((prev) => [...prev, ...more])
+      const prev = entriesRef.current
+      const seen = new Set(prev.map((r) => r.id))
+      const add = more.filter((r) => r.id && !seen.has(r.id))
+      if (add.length === 0) {
+        setListHasMore(false)
+        return
+      }
+      setEntries((p) => [...p, ...add])
       setListHasMore(more.length === n)
     } finally {
       setListLoadingMore(false)
@@ -433,7 +442,10 @@ export default function ActivityPage() {
         if (!col || !ACTIVITY_LOG_PAYLOAD_KEYS.has(col)) continue
         if (!(s.key in metricDraft)) continue
         const raw = metricDraft[s.key]
-        if (raw === '' || raw === null || raw === undefined) continue
+        if (raw === '' || raw === null || raw === undefined) {
+          payload[col] = null
+          continue
+        }
         let v = raw
         if (s.data_type === 'integer') {
           v = parseInt(String(raw), 10)
@@ -506,12 +518,19 @@ export default function ActivityPage() {
       </div>
 
       {/* Übersicht */}
-      {stats && stats.count>0 && (
+      {stats && (stats.total_in_profile > 0 || stats.count > 0) && (
         <div className="card section-gap">
+          <div style={{ fontSize: 11, color: 'var(--text3)', marginBottom: 8, lineHeight: 1.45 }}>
+            <strong>{stats.total_in_profile ?? '–'}</strong> Einträge im Profil (gleicher Filter wie diese Seite). Die Summen
+            Kcal/Stunden beziehen sich auf die <strong>neuesten {stats.sample_size ?? stats.count}</strong> Einträge (max.
+            30).
+          </div>
           <div style={{display:'flex',gap:8,flexWrap:'wrap'}}>
-            {[['Trainings',stats.count,'var(--text1)'],
+            {[
-              ['Kcal gesamt',Math.round(stats.total_kcal),'#EF9F27'],
+              ['Neueste (max. 30)', stats.count, 'var(--text1)'],
-              ['Stunden',Math.round(stats.total_min/60*10)/10,'#378ADD']].map(([l,v,c])=>(
+              ['Kcal (darin)', Math.round(stats.total_kcal), '#EF9F27'],
+              ['Stunden (darin)', Math.round(stats.total_min / 60 * 10) / 10, '#378ADD'],
+            ].map(([l, v, c]) => (
               <div key={l} style={{flex:1,minWidth:80,background:'var(--surface2)',borderRadius:8,padding:'8px 10px',textAlign:'center'}}>
                 <div style={{fontSize:18,fontWeight:700,color:c}}>{v}</div>
                 <div style={{fontSize:10,color:'var(--text3)'}}>{l}</div>