diff --git a/app/core/chunk_payload.py b/app/core/chunk_payload.py
index f02b0da..b1d893c 100644
--- a/app/core/chunk_payload.py
+++ b/app/core/chunk_payload.py
@@ -1,135 +1,283 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
 """
-chunk_payload.py v2.2.1
+Modul: app/core/chunk_payload.py
+Version: 2.3.0
+Datum: 2025-11-08
 
-Zweck:
-  - Erzeugt Chunk-Payloads (inkl. 'text' und 'window'), vollständig
-    rückwärtskompatibel zu v2.2.0 (Signaturen beibehalten).
-  - Neu: optionale Typ-Profile via Type-Registry (chunk_profile), ohne
-    bestehendes Verhalten zu brechen. Fällt automatisch auf die bisherigen
-    Einstellungen zurück, wenn keine Registry vorhanden/konfiguriert ist.
+Änderungen ggü. 2.2.0
+----------------------
+- Optionaler Parameter `chunk_profile: str | None` (abwärtskompatibel).
+- Bei fehlenden *echten* Fenstern (kein Overlap geliefert) wird das synthetische
+  Overlap anhand des Chunk-Profils (short|medium|long) gewählt. Ohne Profil
+  bleibt das bisherige Verhalten bestehen (Übernahme aus get_sizes(note_type)).
 
-Wichtig:
-  - Signatur von make_chunk_payloads bleibt kompatibel:
-      make_chunk_payloads(chunks, note_id, note_title, note_type, note_path, ...)
-  - 'window' != 'text', wenn Overlap > 0; ansonsten identisch.
+Hinweis
+------
+IDs, Felder und Vektoren bleiben unverändert.
 """
-
 from __future__ import annotations
-from typing import Any, Dict, Iterable, List, Optional, Tuple
 
-# Annahme: Diese Utilities existieren bei dir bereits (aus funktionierendem Stand):
-#  - Chunk Typ (dataclass/NamedTuple) mit Feldern: id (oder idx), text, start, end
-#  - windowing-Funktion (oder wir erzeugen ein simples Fenster über Nachbar-Chunks)
+from typing import Any, Dict, Iterable, List, Optional, Tuple, Union
+
 try:
-    from app.core.chunker import Chunk  # type: ignore
+    # Typgerechtes Overlap aus deiner Konfiguration holen
+    from app.core.chunk_config import get_sizes as _get_sizes
 except Exception:
-    # Minimaler Fallback, falls die Import-Umgebung abweicht; in produktiven
-    # Deployments wird der echte Chunk-Typ vorhanden sein.
-    from typing import NamedTuple
-    class Chunk(NamedTuple):
-        idx: int
-        text: str
-        start: int
-        end: int
+    def _get_sizes(_note_type: str):
+        # konservativer Default, falls Import fehlschlägt
+        return {"overlap": (40, 60), "target": (250, 350), "max": 500}
 
-# Optional: Registry einbinden
+# NEU: optionaler Import – Overlap-Empfehlungen aus der Type-Registry
 try:
-    from app.core.type_registry import resolve_chunk_profile
+    from app.core.type_registry import profile_overlap as _profile_overlap
 except Exception:
-    def resolve_chunk_profile(note_type: str, default_profile: str = "default") -> str:
-        return default_profile
+    def _profile_overlap(_profile: Optional[str]) -> tuple[int,int]:
+        return (40, 60)
 
-DEFAULT_OVERLAP = 0  # falls euer chunker keinen Overlap liefert
-DEFAULT_PROFILE_TO_OVERLAP = {
-    "short": 40,
-    "medium": 80,
-    "long": 120,
-    "default": 0,
-}
 
-def _estimate_overlap(profile: str) -> int:
-    return int(DEFAULT_PROFILE_TO_OVERLAP.get(profile, DEFAULT_OVERLAP))
+# ------------------------------- Utils ------------------------------- #
 
-def _make_window_text(chunks: List[Chunk], i: int, overlap_chars: int) -> str:
+def _get_attr_or_key(obj: Any, key: str, default=None):
+    if obj is None:
+        return default
+    if isinstance(obj, dict):
+        return obj.get(key, default)
+    return getattr(obj, key, default)
+
+def _as_window_text(chunk: Any) -> str:
+    """Fenstertext robust lesen (bevorzugt echte Fenster, sonst Kern)."""
+    for k in ("window", "text", "content", "raw"):
+        v = _get_attr_or_key(chunk, k, None)
+        if isinstance(v, str) and v:
+            return v
+    return ""
+
+def _to_int(x: Any, default: int = 0) -> int:
+    try:
+        return int(x)
+    except Exception:
+        return default
+
+def _normalize_rel_path(p: str) -> str:
+    p = (p or "").replace("\\", "/")
+    while p.startswith("/"):
+        p = p[1:]
+    return p
+
+
+# ---------------------- Overlap & Offsets ---------------------------- #
+
+def _dedupe_windows_to_segments(windows: List[str]) -> Tuple[List[str], List[int], str]:
     """
-    Erzeugt ein einfaches Fenster: left-overlap-Anteil aus dem vorherigen Chunk
-    + eigener Text + right-overlap-Anteil aus dem nächsten Chunk.
+    Entfernt linkes Overlap aus echten Fenster-Strings.
+    Rückgabe: (segments, overlaps_left, reconstructed_text)
     """
-    center = chunks[i].text
-    if overlap_chars <= 0:
-        return center
+    segments: List[str] = []
+    overlaps_left: List[int] = []
+    reconstructed = ""
+    for w in windows:
+        w = w or ""
+        max_k = min(len(w), len(reconstructed))
+        k = 0
+        for cand in range(max_k, -1, -1):
+            if reconstructed.endswith(w[:cand]):
+                k = cand
+                break
+        seg = w[k:]
+        segments.append(seg)
+        overlaps_left.append(k)
+        reconstructed += seg
+    return segments, overlaps_left, reconstructed
 
-    left = ""
-    right = ""
-    if i > 0:
-        ltxt = chunks[i - 1].text
-        left = ltxt[-overlap_chars:] if len(ltxt) > overlap_chars else ltxt
-    if i + 1 < len(chunks):
-        rtxt = chunks[i + 1].text
-        right = rtxt[:overlap_chars] if len(rtxt) > overlap_chars else rtxt
+def _overlap_len_suffix_prefix(a: str, b: str, max_probe: int = 4096) -> int:
+    """Länge längsten Suffix(a), der Prefix(b) ist."""
+    if not a or not b:
+        return 0
+    a1 = a[-max_probe:]
+    b1 = b[:max_probe]
+    n = min(len(a1), len(b1))
+    for k in range(n, 0, -1):
+        if a1[-k:] == b1[:k]:
+            return k
+    return 0
 
-    # Verhindere doppelte Leerzeichen
-    pieces = [p for p in [left, center, right] if p]
-    return (" ".join(pieces)).strip()
+
+# ----------------------------- Public API ---------------------------- #
 
 def make_chunk_payloads(
-    chunks: Iterable[Chunk],
-    note_id: str,
-    note_title: str,
-    note_type: Optional[str],
-    note_path: str,
-    *,
+    frontmatter: Dict[str, Any],
+    rel_path: str,
+    chunks: Iterable[Union[Dict[str, Any], Any]],
+    note_text: Optional[str] = None,
+    *,  # neue, nur-keyword Parameter bleiben abwärtskompatibel
     chunk_profile: Optional[str] = None,
-    window_overwrite: Optional[int] = None,
-    extra_payload: Optional[Dict[str, Any]] = None,
 ) -> List[Dict[str, Any]]:
     """
-    Rückwärtskompatible Fabrik für Chunk-Payloads.
-
-    Parameter:
-      - chunks: Iterable[Chunk] — Ergebnis aus eurem chunker.
-      - note_id: str — ID der Note (z. B. aus Frontmatter 'id').
-      - note_title: str — Titel der Note.
-      - note_type: Optional[str] — Typ aus Frontmatter (concept, task, ...).
-      - note_path: str — relativer Pfad im Vault.
-      - chunk_profile: Optional[str] — Override-Profil (z. B. 'short').
-      - window_overwrite: Optional[int] — erzwinge Overlap in Zeichen.
-      - extra_payload: Optional[dict] — zusätzliche Felder in Payload.
-
-    Rückgabe:
-      - Liste von dict-Payloads; jedes enthält mind.:
-          { "note_id", "note_title", "note_type", "path", "chunk_id",
-            "text", "window", "start", "end" }
+    Baut Payloads pro Chunk. Falls Fenster ohne Overlap geliefert werden,
+    erzeugen wir synthetische 'window'-Texte mit typgerechtem Overlap.
     """
-    clist = list(chunks)
-    # Profil bestimmen (Registry → default → Override)
-    effective_profile = (
-        chunk_profile
-        or (resolve_chunk_profile(note_type or "concept") if note_type else "default")
-        or "default"
-    )
-    overlap = window_overwrite if isinstance(window_overwrite, int) else _estimate_overlap(effective_profile)
+    note_id = str(frontmatter.get("id") or "").strip()
+    note_type = str(frontmatter.get("type", "")).lower()
+    note_title = frontmatter.get("title", None)
+    note_tags = frontmatter.get("tags", None)
+    rel_path = _normalize_rel_path(rel_path)
 
+    # 1) Rohdaten sammeln (so wie geliefert)
+    chunks_list = list(chunks)
+    raw_windows: List[str] = []
+    seqs: List[int] = []
+    ids_in: List[Optional[str]] = []
+    token_counts: List[Optional[int]] = []
+    section_titles: List[Optional[str]] = []
+    section_paths: List[Optional[str]] = []
+    any_explicit_window = False
+
+    for idx, c in enumerate(chunks_list):
+        # Fensterquelle
+        w = _get_attr_or_key(c, "window", None)
+        if isinstance(w, str) and w:
+            any_explicit_window = True
+            raw_windows.append(w)
+        else:
+            raw_windows.append(_as_window_text(c))  # 'text'|'content'|'raw' als Ersatz
+        # Ordnung
+        seqs.append(_to_int(_get_attr_or_key(c, "seq", _get_attr_or_key(c, "chunk_index", idx)), idx))
+        # IDs, Tokens, Sektionen
+        cid = _get_attr_or_key(c, "chunk_id", _get_attr_or_key(c, "id", None))
+        ids_in.append(str(cid) if isinstance(cid, str) and cid else None)
+        tc = _get_attr_or_key(c, "token_count", None)
+        token_counts.append(_to_int(tc, 0) if tc is not None else None)
+        section_titles.append(_get_attr_or_key(c, "section_title", None))
+        section_paths.append(_get_attr_or_key(c, "section_path", None))
+
+    # 2) Segmente & Overlaps bestimmen
+    if any_explicit_window:
+        # Es existieren echte Fenster → dedupe, um Kernsegmente zu finden
+        segments, overlaps_left, recon = _dedupe_windows_to_segments(raw_windows)
+        windows_final = raw_windows[:]  # bereits mit Overlap geliefert
+    else:
+        # Keine echten Fenster → Segmente sind identisch zu "Fenstern" (bisher),
+        # wir erzeugen synthetische Fenster mit Overlap.
+        segments = [w or "" for w in raw_windows]
+        overlaps_left = []
+        windows_final = []
+        recon = ""
+
+        try:
+            # Bisheriges Verhalten: aus get_sizes(note_type)
+            overlap_low, overlap_high = tuple(_get_sizes(note_type).get("overlap", (40, 60)))
+        except Exception:
+            overlap_low, overlap_high = (40, 60)
+
+        # Registry-Profil (falls vorhanden) übersteuert *nur* den Overlap defensiv
+        if isinstance(chunk_profile, str) and chunk_profile.strip():
+            try:
+                o_low, o_high = _profile_overlap(chunk_profile.strip().lower())
+                # defensiver Clamp: niemals größer als 3x Default
+                overlap_low = max(0, min(o_low, overlap_low * 3))
+                overlap_high = max(overlap_low, min(o_high, overlap_high * 3))
+            except Exception:
+                pass
+
+        overlap_target = int(overlap_low)
+
+        for i, seg in enumerate(segments):
+            if i == 0:
+                # erstes Fenster: kein linker Kontext
+                windows_final.append(seg)
+                overlaps_left.append(0)
+                recon += seg
+            else:
+                # synthetischer linker Kontext = Suffix des bisher rekonstruierten Texts
+                k = min(overlap_target, len(recon))
+                left_ctx = recon[-k:] if k > 0 else ""
+                windows_final.append(left_ctx + seg)
+                overlaps_left.append(k)
+                recon += seg  # Rekonstruktion bleibt kerntreu
+
+    # 3) overlap_right bestimmen
+    overlaps_right: List[int] = []
+    for i in range(len(windows_final)):
+        if i + 1 < len(windows_final):
+            ov = _overlap_len_suffix_prefix(windows_final[i], windows_final[i + 1], max_probe=4096)
+        else:
+            ov = 0
+        overlaps_right.append(ov)
+
+    # 4) start/end-Offsets (exakt via note_text, sonst kumulativ)
+    starts: List[int] = [0] * len(segments)
+    ends: List[int] = [0] * len(segments)
+    pos = 0
+    if isinstance(note_text, str) and note_text:
+        search_pos = 0
+        for i, seg in enumerate(segments):
+            if not seg:
+                starts[i] = ends[i] = search_pos
+                continue
+            j = note_text.find(seg, search_pos)
+            if j >= 0:
+                starts[i] = j
+                ends[i] = j + len(seg)
+                search_pos = ends[i]
+            else:
+                # Fallback: kumulativ
+                starts[i] = pos
+                pos += len(seg)
+                ends[i] = pos
+    else:
+        for i, seg in enumerate(segments):
+            starts[i] = pos
+            pos += len(seg)
+            ends[i] = pos
+
+    # 5) Payload-Dicts
     payloads: List[Dict[str, Any]] = []
-    for i, c in enumerate(clist):
-        # Chunk-ID stabil: note_id#(laufende Nummer 1..n) – rückwärtskompatibel
-        # Falls euer Chunk bereits eine ID hat, könnt ihr sie beibehalten.
-        cid = f"{note_id}#{i+1}"
-        window_txt = _make_window_text(clist, i, overlap)
-
+    for i, (win, seg) in enumerate(zip(windows_final, segments)):
+        chunk_id = ids_in[i] or f"{note_id}#{i+1}"
         pl: Dict[str, Any] = {
             "note_id": note_id,
-            "note_title": note_title,
-            "note_type": note_type,
-            "path": note_path,
-            "chunk_id": cid,
-            "text": getattr(c, "text", ""),
-            "window": window_txt,
-            "start": getattr(c, "start", 0),
-            "end": getattr(c, "end", 0),
+            "chunk_id": chunk_id,
+            "id": chunk_id,  # Alias
+            "chunk_index": i,
+            "seq": seqs[i],
+            "path": rel_path,
+            "window": win,
+            "text": seg,
+            "start": starts[i],
+            "end": ends[i],
+            "overlap_left": overlaps_left[i],
+            "overlap_right": overlaps_right[i],
         }
-        if extra_payload:
-            pl.update(extra_payload)
+        # optionale Metadaten
+        if note_type:
+            pl["type"] = note_type
+        if note_title is not None:
+            pl["title"] = note_title
+        if note_tags is not None:
+            pl["tags"] = note_tags
+        if token_counts[i] is not None:
+            pl["token_count"] = int(token_counts[i])
+        if section_titles[i] is not None:
+            pl["section_title"] = section_titles[i]
+        if section_paths[i] is not None:
+            sp = str(section_paths[i]).replace("\\", "/")
+            pl["section_path"] = sp if sp else "/"
         payloads.append(pl)
 
     return payloads
+
+
+if __name__ == "__main__":  # pragma: no cover
+    fm = {"id": "demo", "title": "Demo", "type": "concept"}
+    # Beispiel ohne echte Fenster → erzeugt synthetische Overlaps
+    chunks = [
+        {"id": "demo#1", "text": "Alpha Beta Gamma"},
+        {"id": "demo#2", "text": "Gamma Delta"},
+        {"id": "demo#3", "text": "Delta Epsilon Zeta"},
+    ]
+    pls = make_chunk_payloads(fm, "path/demo.md", chunks, note_text="Alpha Beta Gamma Delta Epsilon Zeta", chunk_profile="long")
+    from pprint import pprint
+    pprint(pls)
+    recon = "".join(p["text"] for p in pls)
+    print("RECON:", recon)