diff --git a/backend/csv_parser/executor.py b/backend/csv_parser/executor.py
index b018526..d667e9f 100644
--- a/backend/csv_parser/executor.py
+++ b/backend/csv_parser/executor.py
@@ -588,6 +588,9 @@ def _import_vitals_baseline(
             continue
         iso = d.isoformat()
         try:
+            # Ohne SAVEPOINT: erster fehlgeschlagener INSERT setzt die Xact auf „aborted“,
+            # alle folgenden Queries + commit() schlagen fehl → generischer 500.
+            cur.execute("SAVEPOINT vitals_csv_row")
             cur.execute(
                 """
                 INSERT INTO vitals_baseline (
@@ -619,8 +622,15 @@ def _import_vitals_baseline(
                 updated += 1
                 if result.get("id"):
                     affected_ids["vitals_baseline"].append(str(result["id"]))
+            cur.execute("RELEASE SAVEPOINT vitals_csv_row")
         except Exception as e:
-            error_details.append({"row": rows_total, "error": str(e)})
+            try:
+                cur.execute("ROLLBACK TO SAVEPOINT vitals_csv_row")
+            except Exception:
+                pass
+            error_details.append(
+                {"row": rows_total, "error": str(e), "context": "vitals_baseline upsert"},
+            )
 
     return {
         "rows_total": rows_total,
diff --git a/backend/migrations/048_vitals_baseline_source_csv.sql b/backend/migrations/048_vitals_baseline_source_csv.sql
index 58cd3ae..7844d06 100644
--- a/backend/migrations/048_vitals_baseline_source_csv.sql
+++ b/backend/migrations/048_vitals_baseline_source_csv.sql
@@ -1,5 +1,22 @@
--- Universal-CSV-Import schreibt source = 'csv'; bisherige CHECK erlaubte das nicht → 500 beim Import.
-ALTER TABLE vitals_baseline DROP CONSTRAINT IF EXISTS vitals_baseline_source_check;
+-- Universal-CSV-Import setzt source = 'csv'. Alte CHECK-Constraints kennen das nicht.
+-- Namen können je nach PG-Version abweichen → alle passenden CHECK Constraints zu source droppen.
+DO $$
+DECLARE
+  r RECORD;
+BEGIN
+  FOR r IN
+    SELECT c.conname
+    FROM pg_constraint c
+    JOIN pg_class t ON c.conrelid = t.oid
+    WHERE t.relname = 'vitals_baseline'
+      AND c.contype = 'c'
+      AND pg_get_constraintdef(c.oid) ILIKE '%source%'
+      AND pg_get_constraintdef(c.oid) ILIKE '%IN %'
+  LOOP
+    EXECUTE format('ALTER TABLE vitals_baseline DROP CONSTRAINT %I', r.conname);
+  END LOOP;
+END $$;
+
 ALTER TABLE vitals_baseline ADD CONSTRAINT vitals_baseline_source_check
     CHECK (source IN ('manual', 'apple_health', 'garmin', 'withings', 'csv'));
 
diff --git a/backend/migrations/049_vitals_baseline_source_csv_idempotent.sql b/backend/migrations/049_vitals_baseline_source_csv_idempotent.sql
new file mode 100644
index 0000000..1eca76f
--- /dev/null
+++ b/backend/migrations/049_vitals_baseline_source_csv_idempotent.sql
@@ -0,0 +1,20 @@
+-- Idempotent: erneute Bereinigung der source-CHECK, falls 048 zuvor nicht griff oder nur teilweise lief.
+DO $$
+DECLARE
+  r RECORD;
+BEGIN
+  FOR r IN
+    SELECT c.conname
+    FROM pg_constraint c
+    JOIN pg_class t ON c.conrelid = t.oid
+    WHERE t.relname = 'vitals_baseline'
+      AND c.contype = 'c'
+      AND pg_get_constraintdef(c.oid) ILIKE '%source%'
+      AND pg_get_constraintdef(c.oid) ILIKE '%IN %'
+  LOOP
+    EXECUTE format('ALTER TABLE vitals_baseline DROP CONSTRAINT %I', r.conname);
+  END LOOP;
+END $$;
+
+ALTER TABLE vitals_baseline ADD CONSTRAINT vitals_baseline_source_check
+    CHECK (source IN ('manual', 'apple_health', 'garmin', 'withings', 'csv'));
diff --git a/backend/routers/csv_import.py b/backend/routers/csv_import.py
index 8a7a590..083ce84 100644
--- a/backend/routers/csv_import.py
+++ b/backend/routers/csv_import.py
@@ -477,6 +477,7 @@ async def csv_import_execute(
                     m,
                 )
             except Exception as exec_err:
+                logger.exception("Universal-CSV-Import fehlgeschlagen: %s", exec_err)
                 cur.execute("ROLLBACK TO SAVEPOINT csv_import_exec")
                 cur.execute(
                     """
diff --git a/backend/version.py b/backend/version.py
index d7fdaa1..9f52bbf 100644
--- a/backend/version.py
+++ b/backend/version.py
@@ -9,7 +9,7 @@ Semantic Versioning: MAJOR.MINOR.PATCH
 
 APP_VERSION = "0.9p"
 BUILD_DATE = "2026-04-09"
-DB_SCHEMA_VERSION = "20260409b"  # u. a. 048 vitals_baseline.source csv
+DB_SCHEMA_VERSION = "20260409c"  # 048/049 vitals_baseline.source csv + SAVEPOINT Import
 
 MODULE_VERSIONS = {
     "auth": "1.2.0",