diff --git a/.gitea/workflows/test.yml b/.gitea/workflows/test.yml
index 87dde5a..a26a78d 100644
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@@ -34,7 +34,7 @@ jobs:
           docker compose -f "$COMPOSE_FILE" exec -T backend sh -lc "
             pip install -r /app/requirements-dev.txt &&
             cd /app &&
-            python -m pytest tests -m 'not slow' -q --tb=short
+            python -m pytest tests -m 'not slow' -ra -vv --tb=short
           "
 
   lint-backend:
diff --git a/backend/csv_parser/executor.py b/backend/csv_parser/executor.py
index 3bfcd85..b80d01c 100644
--- a/backend/csv_parser/executor.py
+++ b/backend/csv_parser/executor.py
@@ -130,6 +130,7 @@ def run_universal_csv_import(
             bool(has_header),
             fm,
             tc,
+            mapping,
             error_details,
             affected_ids,
         )
@@ -169,6 +170,7 @@ def run_universal_csv_import(
             bool(has_header),
             fm,
             tc,
+            mapping,
             error_details,
             affected_ids,
         )
@@ -296,19 +298,18 @@ def _import_weight(
     has_header: bool,
     fm: dict,
     tc: dict | None,
+    mapping: dict[str, Any],
     error_details: list,
     affected_ids: dict,
 ) -> dict[str, int]:
+    spec = resolve_import_row_processing("weight", mapping)
+    mapped_rows: list[dict[str, Any]] = []
     rows_total = 0
-    inserted = 0
-    updated = 0
-    new_entries = 0
     for csv_row in iter_csv_dict_rows(text, delim, has_header=has_header):
         rows_total += 1
         mapped = build_row_after_mapping(csv_row, fm, tc, module="weight")
         d = coerce_date(mapped.get("date"))
         w = mapped.get("weight")
-        note = mapped.get("note")
         if d is None:
             error_details.append({"row": rows_total, "error": "Datum fehlt"})
             continue
@@ -316,10 +317,37 @@ def _import_weight(
             error_details.append({"row": rows_total, "error": "Gewicht fehlt"})
             continue
         try:
-            w = float(w)
+            float(w)
         except (TypeError, ValueError):
             error_details.append({"row": rows_total, "error": "Gewicht ungültig"})
             continue
+        mapped["date"] = d
+        mapped_rows.append(mapped)
+
+    if spec:
+        try:
+            validate_import_row_processing("weight", spec, fm)
+        except ValueError as e:
+            raise ValueError(str(e)) from e
+        merged_rows = aggregate_mapped_rows(mapped_rows, spec)
+    else:
+        merged_rows = list(mapped_rows)
+
+    inserted = 0
+    updated = 0
+    new_entries = 0
+    for merged in merged_rows:
+        d = coerce_date(merged.get("date"))
+        w = merged.get("weight")
+        note = merged.get("note")
+        if d is None:
+            continue
+        if w is None:
+            continue
+        try:
+            w = float(w)
+        except (TypeError, ValueError):
+            continue
         iso = d.isoformat()
         cur.execute(
             "SELECT id FROM weight_log WHERE profile_id=%s AND date=%s",
@@ -496,13 +524,14 @@ def _import_vitals_baseline(
     has_header: bool,
     fm: dict,
     tc: dict | None,
+    mapping: dict[str, Any],
     error_details: list,
     affected_ids: dict,
 ) -> dict[str, int]:
+    spec = resolve_import_row_processing("vitals_baseline", mapping)
+    mapped_rows: list[dict[str, Any]] = []
     rows_total = 0
-    inserted = 0
-    updated = 0
-    skipped = 0
+    skipped_prefilter = 0
     for csv_row in iter_csv_dict_rows(text, delim, has_header=has_header):
         rows_total += 1
         mapped = build_row_after_mapping(csv_row, fm, tc, module="vitals_baseline")
@@ -515,6 +544,33 @@ def _import_vitals_baseline(
         vo2 = _v_safe_float(mapped.get("vo2_max"))
         spo2 = _v_safe_int(mapped.get("spo2"))
         resp = _v_safe_float(mapped.get("respiratory_rate"))
+        if not any(x is not None for x in (rhr, hrv, vo2, spo2, resp)):
+            skipped_prefilter += 1
+            continue
+        mapped["date"] = d
+        mapped_rows.append(mapped)
+
+    if spec:
+        try:
+            validate_import_row_processing("vitals_baseline", spec, fm)
+        except ValueError as e:
+            raise ValueError(str(e)) from e
+        merged_rows = aggregate_mapped_rows(mapped_rows, spec)
+    else:
+        merged_rows = list(mapped_rows)
+
+    inserted = 0
+    updated = 0
+    skipped = skipped_prefilter
+    for merged in merged_rows:
+        d = coerce_date(merged.get("date"))
+        if d is None:
+            continue
+        rhr = _v_safe_int(merged.get("resting_hr"))
+        hrv = _v_safe_int(merged.get("hrv"))
+        vo2 = _v_safe_float(merged.get("vo2_max"))
+        spo2 = _v_safe_int(merged.get("spo2"))
+        resp = _v_safe_float(merged.get("respiratory_rate"))
         if not any(x is not None for x in (rhr, hrv, vo2, spo2, resp)):
             skipped += 1
             continue
diff --git a/backend/csv_parser/module_registry.py b/backend/csv_parser/module_registry.py
index 8d22c0e..4ac8ec9 100644
--- a/backend/csv_parser/module_registry.py
+++ b/backend/csv_parser/module_registry.py
@@ -69,6 +69,16 @@ MODULE_DEFINITIONS: Dict[str, Dict[str, Any]] = {
         },
         "duplicate_key": ["profile_id", "date"],
         "duplicate_strategy": "update",
+        "import_row_processing_default": {
+            "group_by": ["date"],
+            "aggregates": {
+                "resting_hr": "mean",
+                "hrv": "mean",
+                "vo2_max": "mean",
+                "spo2": "mean",
+                "respiratory_rate": "mean",
+            },
+        },
     },
     "blood_pressure": {
         "table": "blood_pressure_log",
@@ -92,6 +102,14 @@ MODULE_DEFINITIONS: Dict[str, Dict[str, Any]] = {
         },
         "duplicate_key": ["profile_id", "date"],
         "duplicate_strategy": "update",
+        # Mehrere CSV-Zeilen pro Tag → ein Eintrag (letzte Zeile im Export zählt)
+        "import_row_processing_default": {
+            "group_by": ["date"],
+            "aggregates": {
+                "weight": "last",
+                "note": "last",
+            },
+        },
     },
 }
 
diff --git a/backend/tests/test_csv_import_executor.py b/backend/tests/test_csv_import_executor.py
index 28d7327..8750d2b 100644
--- a/backend/tests/test_csv_import_executor.py
+++ b/backend/tests/test_csv_import_executor.py
@@ -130,6 +130,45 @@ def test_run_universal_import_vitals_baseline_upsert_insert_path():
     assert any("INSERT INTO vitals_baseline" in q[0] for q in cur.executes)
 
 
+def test_run_universal_import_vitals_baseline_two_rows_same_day_averages():
+    text = (
+        "Start,Resting Heart Rate,Heart Rate Variability,VO2 Max\n"
+        "2024-01-15 07:00:00,50,40,42.0\n"
+        "2024-01-15 18:00:00,60,50,43.0\n"
+    )
+    mapping = {
+        "delimiter": ",",
+        "has_header": True,
+        "field_mappings": {
+            "Start": "date",
+            "Resting Heart Rate": "resting_hr",
+            "Heart Rate Variability": "hrv",
+            "VO2 Max": "vo2_max",
+        },
+        "type_conversions": {
+            "date": {
+                "type": "datetime",
+                "format": "yyyy-mm-dd HH:MM:SS",
+                "extract": "date_only",
+                "flexible": True,
+            },
+            "resting_hr": {"type": "int", "flexible": True},
+            "hrv": {"type": "int", "flexible": True},
+            "vo2_max": {"type": "float", "decimal_separator": ".", "flexible": True},
+        },
+    }
+    cur = _SeqCursor([{"inserted": True, "id": "bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb"}])
+    out = run_universal_csv_import(cur, PID, "vitals_baseline", text, "v2.csv", mapping)
+    assert out["rows_total"] == 2
+    assert out["rows_imported"] == 1
+    upsert = [q for q in cur.executes if "INSERT INTO vitals_baseline" in q[0]]
+    assert len(upsert) == 1
+    params = upsert[0][1]
+    assert params[2] == 55
+    assert params[3] == 45
+    assert params[4] == 42.5
+
+
 def test_run_universal_import_activity_garmin_time_plus_date_columns(monkeypatch):
     """Datum in eigener Spalte, Uhrzeit wie bei Garmin nur als Uhrzeit."""
     monkeypatch.setattr(
@@ -215,3 +254,25 @@ def test_run_universal_import_nutrition_two_rows_same_day_aggregates_to_one_row(
     assert params[4] == 15.0
     assert params[5] == 30.0
     assert params[6] == 45.0
+
+
+def test_run_universal_import_weight_two_rows_same_day_last_value():
+    """Mehrere Gewichtszeilen pro Tag → Standard: letzter Wert in der Datei."""
+    text = "Date,Weight\n2024-01-15,85.0\n2024-01-15,83.5\n"
+    mapping = {
+        "delimiter": ",",
+        "has_header": True,
+        "field_mappings": {"Date": "date", "Weight": "weight"},
+        "type_conversions": {
+            "date": {"type": "date", "format": "yyyy-mm-dd", "flexible": True},
+            "weight": {"type": "float", "decimal_separator": ".", "flexible": True},
+        },
+    }
+    cur = _SeqCursor([None])
+    out = run_universal_csv_import(cur, PID, "weight", text, "w.csv", mapping)
+    assert out["rows_total"] == 2
+    assert out["rows_imported"] == 1
+    insert_sqls = [q for q in cur.executes if "INSERT INTO weight_log" in q[0]]
+    assert len(insert_sqls) == 1
+    params = insert_sqls[0][1]
+    assert params[3] == 83.5
diff --git a/backend/tests/test_import_row_processing.py b/backend/tests/test_import_row_processing.py
index 8f32ba2..92684ad 100644
--- a/backend/tests/test_import_row_processing.py
+++ b/backend/tests/test_import_row_processing.py
@@ -65,3 +65,24 @@ def test_resolve_none_uses_nutrition_default():
     spec = resolve_import_row_processing("nutrition", {})
     assert spec is not None
     assert "date" in (spec.get("group_by") or [])
+
+
+def test_resolve_weight_default_uses_last():
+    spec = resolve_import_row_processing("weight", {})
+    assert spec is not None
+    assert spec.get("aggregates", {}).get("weight") == "last"
+    assert spec.get("aggregates", {}).get("note") == "last"
+
+
+def test_validate_weight_import_row_processing_ok():
+    validate_import_row_processing(
+        "weight",
+        {"group_by": ["date"], "aggregates": {"weight": "mean"}},
+        {"D": "date", "W": "weight"},
+    )
+
+
+def test_resolve_vitals_baseline_default_uses_mean():
+    spec = resolve_import_row_processing("vitals_baseline", {})
+    assert spec is not None
+    assert spec.get("aggregates", {}).get("resting_hr") == "mean"