Enhance chunking strategies and graph utilities for section-type transitions

- Implemented WP-26 v1.1: Section-Type-Wechsel erzwingt immer einen neuen Chunk, um konsistente Chunking-Verhalten bei unterschiedlichen section_types zu gewährleisten.
- Introduced automatic Intra-Note-Edges zwischen Sektionen mit unterschiedlichen Typen, um semantische Beziehungen zu erfassen.
- Updated graph utilities to support automatic edge type derivation based on section transitions.
- Added unit tests for section-type changes and automatic edge generation to ensure functionality and reliability.

app/core/chunking/chunking_strategies.py

@@ -7,6 +7,8 @@ DESCRIPTION: Strategien für atomares Sektions-Chunking v3.9.9.
              - Fix: Synchronisierung der Parameter mit dem Orchestrator (context_prefix).
              WP-24c v4.2.5: Strict-Mode ohne Carry-Over - Bei strict_heading_split wird nach jeder Sektion geflasht.
              WP-26 v1.0: section_type und block_id werden an Chunks weitergegeben.
+             WP-26 v1.1: Section-Type-Wechsel erzwingt IMMER einen neuen Chunk (unabhängig vom Profil).
+                         Gleiche section_types folgen dem normalen Chunking-Verhalten.
 """
 from typing import List, Dict, Any, Optional
 from .chunking_models import RawBlock, Chunk
@@ -53,11 +55,16 @@ def strategy_by_heading(blocks: List[RawBlock], config: Dict[str, Any], note_id:
 
     # --- SCHRITT 1: Gruppierung in atomare Sektions-Einheiten ---
     # WP-26 v1.0: Erweitert um section_type und block_id Tracking
+    # WP-26 v1.1: Section-Type-Wechsel erzwingt IMMER eine neue Sektion (unabhängig vom Profil)
     sections: List[Dict[str, Any]] = []
     curr_blocks = []
-    for b in blocks:
+    current_section_type = None  # WP-26 v1.1: Tracking des aktuellen section_type
-        if b.kind == "heading" and b.level <= split_level:
+    
-            if curr_blocks:
+    def _flush_section():
+        """Hilfsfunktion zum Abschließen einer Sektion."""
+        nonlocal curr_blocks, current_section_type
+        if not curr_blocks:
+            return
         # WP-26 v1.0: Finde den effektiven section_type und block_id für diese Sektion
         # Priorisiere den ersten Block mit section_type, sonst den Heading-Block
         effective_section_type = None
@@ -75,26 +82,41 @@ def strategy_by_heading(blocks: List[RawBlock], config: Dict[str, Any], note_id:
             "section_type": effective_section_type,
             "block_id": effective_block_id
         })
-            curr_blocks = [b]
+        curr_blocks = []
-        else:
+        current_section_type = effective_section_type
-            curr_blocks.append(b)
-    if curr_blocks:
-        # WP-26 v1.0: Gleiche Logik für den letzten Block
-        effective_section_type = None
-        effective_block_id = None
-        for cb in curr_blocks:
-            if cb.section_type and effective_section_type is None:
-                effective_section_type = cb.section_type
-            if cb.block_id and effective_block_id is None:
-                effective_block_id = cb.block_id
     
-        sections.append({
+    for b in blocks:
-            "text": "\n\n".join([x.text for x in curr_blocks]), 
+        # WP-26 v1.1: Prüfe auf Section-Type-Wechsel BEVOR wir den Block hinzufügen
-            "meta": curr_blocks[0],
+        # Wenn sich der section_type ändert, muss die aktuelle Sektion abgeschlossen werden
-            "is_empty": len(curr_blocks) == 1 and curr_blocks[0].kind == "heading",
+        block_section_type = b.section_type
-            "section_type": effective_section_type,
+        
-            "block_id": effective_block_id
+        # Section-Type-Wechsel erkannt?
-        })
+        # (Wechsel ist: alter Typ != neuer Typ UND mindestens einer ist nicht None)
+        is_section_type_change = (
+            curr_blocks and  # Es gibt bereits Blöcke
+            block_section_type is not None and  # Neuer Block hat expliziten section_type
+            current_section_type != block_section_type  # Typ hat sich geändert
+        )
+        
+        if b.kind == "heading" and b.level <= split_level:
+            # Heading-basierter Split (Standard-Verhalten)
+            _flush_section()
+            curr_blocks = [b]
+            current_section_type = block_section_type  # Update tracking
+        elif is_section_type_change:
+            # WP-26 v1.1: Section-Type-Wechsel erzwingt neuen Chunk
+            _flush_section()
+            curr_blocks = [b]
+            current_section_type = block_section_type
+        else:
+            # Normales Hinzufügen zum aktuellen Block
+            curr_blocks.append(b)
+            # Update section_type wenn Block einen hat und wir noch keinen haben
+            if block_section_type and not current_section_type:
+                current_section_type = block_section_type
+    
+    # Letzte Sektion abschließen
+    _flush_section()
 
     # --- SCHRITT 2: Verarbeitung der Queue ---
     queue = list(sections)
@@ -217,14 +239,17 @@ def strategy_sliding_window(blocks: List[RawBlock], config: Dict[str, Any], note
     """
     Standard-Sliding-Window für flache Texte ohne Sektionsfokus.
     WP-26 v1.0: Erweitert um section_type und block_id Weitergabe.
+    WP-26 v1.1: Section-Type-Wechsel erzwingt IMMER einen neuen Chunk.
     """
     target = config.get("target", 400); max_tokens = config.get("max", 600)
     chunks: List[Chunk] = []; buf: List[RawBlock] = []
+    current_section_type = None  # WP-26 v1.1: Tracking des aktuellen section_type
     
-    for b in blocks:
+    def _flush_buffer():
-        b_tokens = estimate_tokens(b.text)
+        """Hilfsfunktion zum Flushen des Buffers."""
-        curr_tokens = sum(estimate_tokens(x.text) for x in buf) if buf else 0
+        nonlocal buf, current_section_type
-        if curr_tokens + b_tokens > max_tokens and buf:
+        if not buf:
+            return
         txt = "\n\n".join([x.text for x in buf]); idx = len(chunks)
         win = _create_win(context_prefix, buf[0].section_title, txt)
         # WP-26 v1.0: Finde effektiven section_type und block_id
@@ -232,26 +257,36 @@ def strategy_sliding_window(blocks: List[RawBlock], config: Dict[str, Any], note
         effective_block_id = next((b.block_id for b in buf if b.block_id), None)
         chunks.append(Chunk(
             id=f"{note_id}#c{idx:02d}", note_id=note_id, index=idx, 
-                text=txt, window=win, token_count=curr_tokens, 
+            text=txt, window=win, token_count=sum(estimate_tokens(x.text) for x in buf), 
             section_title=buf[0].section_title, section_path=buf[0].section_path, 
             neighbors_prev=None, neighbors_next=None,
             section_type=effective_section_type, block_id=effective_block_id
         ))
         buf = []
-        buf.append(b)
+        current_section_type = effective_section_type
     
-    if buf:
+    for b in blocks:
-        txt = "\n\n".join([x.text for x in buf]); idx = len(chunks)
+        b_tokens = estimate_tokens(b.text)
-        win = _create_win(context_prefix, buf[0].section_title, txt)
+        curr_tokens = sum(estimate_tokens(x.text) for x in buf) if buf else 0
-        # WP-26 v1.0: Finde effektiven section_type und block_id
+        block_section_type = b.section_type
-        effective_section_type = next((b.section_type for b in buf if b.section_type), None)
+        
-        effective_block_id = next((b.block_id for b in buf if b.block_id), None)
+        # WP-26 v1.1: Prüfe auf Section-Type-Wechsel
-        chunks.append(Chunk(
+        is_section_type_change = (
-            id=f"{note_id}#c{idx:02d}", note_id=note_id, index=idx, 
+            buf and  # Es gibt bereits Blöcke im Buffer
-            text=txt, window=win, token_count=estimate_tokens(txt), 
+            block_section_type is not None and  # Neuer Block hat expliziten section_type
-            section_title=buf[0].section_title, section_path=buf[0].section_path, 
+            current_section_type != block_section_type  # Typ hat sich geändert
-            neighbors_prev=None, neighbors_next=None,
+        )
-            section_type=effective_section_type, block_id=effective_block_id
+        
-        ))
+        # Flush wenn: Token-Limit überschritten ODER Section-Type-Wechsel
+        if (curr_tokens + b_tokens > max_tokens and buf) or is_section_type_change:
+            _flush_buffer()
+        
+        buf.append(b)
+        # Update section_type wenn Block einen hat und wir noch keinen haben
+        if block_section_type and not current_section_type:
+            current_section_type = block_section_type
+    
+    # Letzten Buffer flushen
+    _flush_buffer()
         
     return chunks

app/core/graph/graph_derive_edges.py

@@ -32,7 +32,8 @@ import logging
 from typing import List, Optional, Dict, Tuple, Set
 from .graph_utils import (
     _get, _edge, _mk_edge_id, _dedupe_seq, parse_link_target,
-    PROVENANCE_PRIORITY, load_types_registry, get_edge_defaults_for
+    PROVENANCE_PRIORITY, load_types_registry, get_edge_defaults_for,
+    get_typical_edge_for  # WP-26 v1.1: Für automatische Intra-Note-Edges
 )
 from .graph_extractors import (
     extract_typed_relations, extract_callout_relations, extract_wikilinks
@@ -646,6 +647,52 @@ def build_edges_for_note(
                     "provenance": "structure", "rule_id": "structure:order", "confidence": PROVENANCE_PRIORITY["structure:order"]
                 }))
     
+    # 1b) WP-26 v1.1: Automatische Intra-Note-Edges zwischen Sektionen mit unterschiedlichen Typen
+    # Wenn sich der section_type zwischen aufeinanderfolgenden Chunks ändert,
+    # wird eine semantische Kante basierend auf graph_schema.md erstellt.
+    for idx, ch in enumerate(chunks):
+        if idx >= len(chunks) - 1:
+            continue  # Kein nächster Chunk
+        
+        cid = _get(ch, "chunk_id", "id")
+        next_ch = chunks[idx + 1]
+        next_id = _get(next_ch, "chunk_id", "id")
+        
+        if not cid or not next_id:
+            continue
+        
+        # Hole die effective_types der Chunks
+        # WP-26 v1.1: section_type oder note_type (effective_type)
+        current_section_type = ch.get("section_type")
+        next_section_type = next_ch.get("section_type")
+        current_type = current_section_type or ch.get("type") or note_type
+        next_type = next_section_type or next_ch.get("type") or note_type
+        
+        # Prüfe, ob es einen Section-Type-Wechsel gibt
+        # Nur wenn beide einen expliziten section_type haben oder sich die effective_types unterscheiden
+        is_section_change = (
+            (current_section_type is not None or next_section_type is not None) and
+            current_type != next_type
+        )
+        
+        if is_section_change:
+            # Ermittle den passenden Edge-Typ aus graph_schema.md
+            edge_kind = get_typical_edge_for(current_type, next_type)
+            
+            logger.debug(f"WP-26 Intra-Note-Edge: {current_type} -> {next_type} = {edge_kind}")
+            
+            # Erstelle die automatische Edge (Forward-Richtung)
+            edges.append(_edge(edge_kind, "chunk", cid, next_id, note_id, {
+                "chunk_id": cid,
+                "edge_id": _mk_edge_id(edge_kind, cid, next_id, "chunk"),
+                "provenance": "rule",
+                "rule_id": "inferred:section_transition",
+                "source_hint": "schema_default",
+                "confidence": PROVENANCE_PRIORITY.get("schema_default", 0.85),
+                "is_internal": True,  # Explizit als Intra-Note-Edge markieren
+                "section_transition": f"{current_type}->{next_type}"  # Debug-Info
+            }))
+
     # 2) Inhaltliche Kanten (Explicit & Candidate Pool)
     reg = load_types_registry()
     defaults = get_edge_defaults_for(note_type, reg)

app/core/graph/graph_utils.py

@@ -33,6 +33,7 @@ PROVENANCE_PRIORITY = {
     "derived:backlink": 0.90,
     "edge_defaults": 0.70,
     "schema_default": 0.85,
+    "inferred:section_transition": 0.85,  # WP-26 v1.1: Automatische Section-Übergänge
     # Struktur-Kanten (provenance: "structure")
     "structure:belongs_to": 1.00,
     "structure:order": 0.95,
@@ -56,6 +57,7 @@ PROVENANCE_TO_DTO = {
     "edge_defaults": ("rule", "edge_defaults"),
     "schema_default": ("rule", "schema_default"),
     "inferred:schema": ("rule", "schema_default"),
+    "inferred:section_transition": ("rule", "schema_default"),  # WP-26 v1.1
     "rule": ("rule", None),
     # structure
     "structure:belongs_to": ("structure", "belongs_to"),
@@ -256,3 +258,156 @@ def get_edge_defaults_for(note_type: Optional[str], reg: dict) -> List[str]:
             return [str(x) for x in v["edge_defaults"] if isinstance(x, str)]
             
     return []
+
+# ---------------------------------------------------------------------------
+# WP-26 v1.1: Graph-Schema Parser für automatische Edge-Typ-Ableitung
+# ---------------------------------------------------------------------------
+
+# Cache für geladenes Schema (vermeidet mehrfaches Parsen)
+_GRAPH_SCHEMA_CACHE: Optional[Dict[str, Dict[str, List[str]]]] = None
+
+def load_graph_schema() -> Dict[str, Dict[str, List[str]]]:
+    """
+    WP-26 v1.1: Parst das graph_schema.md und extrahiert Typical Edge-Types.
+    
+    Das Schema hat folgendes Format:
+    ## Source: `experience`
+    | Target-Note-type | Typical Edge-Types | Prohibited Edge-Types |
+    | :--- | :--- | :--- |
+    | `event` | `caused_by` | `consists_of` |
+    
+    Returns:
+        Dict[source_type, Dict[target_type, List[typical_edges]]]
+        Beispiel: {"experience": {"event": ["caused_by"], "insight": ["resulted_in"]}}
+    """
+    global _GRAPH_SCHEMA_CACHE
+    if _GRAPH_SCHEMA_CACHE is not None:
+        return _GRAPH_SCHEMA_CACHE
+    
+    import re
+    import logging
+    logger = logging.getLogger(__name__)
+    
+    schema_path = get_schema_path()
+    
+    # Versuche verschiedene Pfade
+    paths_to_try = [
+        schema_path,
+        os.path.join(os.getcwd(), "config", "graph_schema.md"),
+        os.path.join(os.path.dirname(__file__), "..", "..", "..", "config", "graph_schema.md"),
+    ]
+    
+    # Falls MINDNET_OBSIDIAN_DICTIONARY gesetzt ist, nutze diesen Pfad
+    obsidian_dict = os.getenv("MINDNET_OBSIDIAN_DICTIONARY")
+    if obsidian_dict:
+        paths_to_try.insert(0, os.path.join(obsidian_dict, "graph_schema.md"))
+    
+    content = None
+    for path in paths_to_try:
+        if os.path.isfile(path):
+            try:
+                with open(path, "r", encoding="utf-8") as f:
+                    content = f.read()
+                logger.debug(f"Graph-Schema geladen von: {path}")
+                break
+            except Exception as e:
+                logger.warning(f"Fehler beim Laden von {path}: {e}")
+    
+    if not content:
+        logger.warning("Graph-Schema nicht gefunden. Fallback auf leeres Schema.")
+        _GRAPH_SCHEMA_CACHE = {}
+        return _GRAPH_SCHEMA_CACHE
+    
+    schema: Dict[str, Dict[str, List[str]]] = {}
+    current_source = None
+    
+    # Regex für Source-Header: ## Source: `experience`
+    source_pattern = re.compile(r'^##\s+Source:\s*`(\w+)`', re.IGNORECASE)
+    
+    # Regex für Tabellen-Zeile: | `event` | `caused_by` | `consists_of` |
+    # oder | `event` | `caused_by`, `resulted_in` | - |
+    table_row_pattern = re.compile(
+        r'^\|\s*`(\w+)`\s*\|\s*([^|]+)\s*\|\s*([^|]*)\s*\|'
+    )
+    
+    for line in content.split('\n'):
+        stripped = line.strip()
+        
+        # Prüfe auf Source-Header
+        source_match = source_pattern.match(stripped)
+        if source_match:
+            current_source = source_match.group(1).lower()
+            if current_source not in schema:
+                schema[current_source] = {}
+            continue
+        
+        # Prüfe auf Tabellen-Zeile (nur wenn wir einen Source haben)
+        if current_source:
+            row_match = table_row_pattern.match(stripped)
+            if row_match:
+                target_type = row_match.group(1).lower()
+                typical_edges_raw = row_match.group(2).strip()
+                
+                # Parse die Edge-Types (können mit Backticks und Kommas getrennt sein)
+                # Format: `caused_by`, `resulted_in` oder `caused_by`
+                edge_pattern = re.compile(r'`(\w+)`')
+                typical_edges = edge_pattern.findall(typical_edges_raw)
+                
+                if typical_edges:
+                    schema[current_source][target_type] = typical_edges
+    
+    logger.info(f"Graph-Schema geladen: {len(schema)} Source-Types")
+    _GRAPH_SCHEMA_CACHE = schema
+    return schema
+
+def get_typical_edge_for(source_type: str, target_type: str) -> Optional[str]:
+    """
+    WP-26 v1.1: Ermittelt den ersten "Typical Edge-Type" für ein Typ-Paar.
+    
+    Args:
+        source_type: Typ der Quell-Sektion (z.B. "experience")
+        target_type: Typ der Ziel-Sektion (z.B. "insight")
+        
+    Returns:
+        Der erste Typical Edge-Type (z.B. "resulted_in") oder None
+    """
+    schema = load_graph_schema()
+    
+    source_lower = source_type.lower() if source_type else "default"
+    target_lower = target_type.lower() if target_type else "any"
+    
+    # 1. Exakter Match
+    if source_lower in schema:
+        source_rules = schema[source_lower]
+        if target_lower in source_rules:
+            edges = source_rules[target_lower]
+            if edges:
+                return edges[0]
+        # 2. Fallback auf "any" Target
+        if "any" in source_rules:
+            edges = source_rules["any"]
+            if edges:
+                return edges[0]
+    
+    # 3. Fallback auf "default" Source
+    if "default" in schema:
+        default_rules = schema["default"]
+        if target_lower in default_rules:
+            edges = default_rules[target_lower]
+            if edges:
+                return edges[0]
+        if "any" in default_rules:
+            edges = default_rules["any"]
+            if edges:
+                return edges[0]
+    
+    # 4. Absoluter Fallback
+    return "related_to"
+
+def clear_graph_schema_cache():
+    """
+    WP-26 v1.1: Löscht den Cache für das Graph-Schema.
+    Nützlich für Tests oder wenn das Schema neu geladen werden soll.
+    """
+    global _GRAPH_SCHEMA_CACHE
+    _GRAPH_SCHEMA_CACHE = None

tests/test_wp26_section_types.py

@@ -1,12 +1,17 @@
 """
 FILE: tests/test_wp26_section_types.py
 DESCRIPTION: Unit-Tests für WP-26 Phase 1: Section-Types und Intra-Note-Edges
-VERSION: 1.0.0
+             WP-26 v1.1: Erweitert um Tests für Section-Split und automatische Edges
+VERSION: 1.1.0
 """
 import pytest
 from app.core.chunking.chunking_parser import parse_blocks
 from app.core.chunking.chunking_models import RawBlock, Chunk
-from app.core.graph.graph_utils import normalize_provenance, _edge
+from app.core.chunking.chunking_strategies import strategy_by_heading, strategy_sliding_window
+from app.core.graph.graph_utils import (
+    normalize_provenance, _edge, get_typical_edge_for, 
+    load_graph_schema, clear_graph_schema_cache
+)
 
 
 class TestSectionTypeRecognition:
@@ -261,5 +266,218 @@ class TestNestedEdgeCallouts:
         assert len(callouts) >= 1
 
 
+# =============================================================================
+# WP-26 v1.1: Tests für Section-Type-Wechsel und automatische Chunk-Splits
+# =============================================================================
+
+class TestSectionTypeSplit:
+    """UT-14: Section-Type-Wechsel erzwingt neuen Chunk"""
+    
+    def test_section_type_change_forces_new_chunk_by_heading(self):
+        """Section-Type-Wechsel erzwingt neuen Chunk (by_heading Strategie)"""
+        md = """
+## Situation ^sit
+> [!section] experience
+
+Die Geschichte beginnt hier.
+
+## Reflexion ^ref
+> [!section] insight
+
+Erkenntnisse aus der Situation.
+"""
+        blocks, _ = parse_blocks(md)
+        
+        # Konfiguration: strict=False (würde normalerweise zusammenfassen)
+        config = {
+            "target": 1000,  # Hoher Wert, um sicherzustellen, dass nicht wegen Token-Limit gesplittet wird
+            "max": 2000,
+            "split_level": 2,
+            "strict_heading_split": False,  # Normalerweise würde zusammengefasst
+            "enable_smart_edge_allocation": True
+        }
+        
+        chunks = strategy_by_heading(blocks, config, "test-note")
+        
+        # Es sollten mindestens 2 Chunks geben (wegen Section-Type-Wechsel)
+        assert len(chunks) >= 2
+        
+        # Prüfe, dass die Chunks unterschiedliche section_types haben
+        section_types = [c.section_type for c in chunks if c.section_type]
+        assert "experience" in section_types
+        assert "insight" in section_types
+    
+    def test_same_section_type_follows_normal_behavior(self):
+        """Gleicher Section-Type folgt normalem Chunking-Verhalten"""
+        md = """
+## Section A
+> [!section] experience
+
+Content A about experience.
+
+## Section B
+> [!section] experience
+
+Content B also about experience.
+"""
+        blocks, _ = parse_blocks(md)
+        
+        # Konfiguration: strict=False (würde zusammenfassen bei gleichem Typ)
+        config = {
+            "target": 1000,
+            "max": 2000,
+            "split_level": 2,
+            "strict_heading_split": False,
+            "enable_smart_edge_allocation": True
+        }
+        
+        chunks = strategy_by_heading(blocks, config, "test-note")
+        
+        # Bei gleichem section_type und strict=False könnten Chunks zusammengefasst werden
+        # (abhängig von Token-Limits)
+        # Wichtig: Alle Chunks sollten section_type "experience" haben
+        for c in chunks:
+            if c.section_type:
+                assert c.section_type == "experience"
+    
+    def test_sliding_window_respects_section_type_change(self):
+        """sliding_window Strategie respektiert Section-Type-Wechsel"""
+        md = """
+## Part 1
+> [!section] experience
+
+Short content.
+
+## Part 2
+> [!section] insight
+
+Another short content.
+"""
+        blocks, _ = parse_blocks(md)
+        
+        config = {
+            "target": 1000,  # Hoher Wert
+            "max": 2000
+        }
+        
+        chunks = strategy_sliding_window(blocks, config, "test-note")
+        
+        # Bei Section-Type-Wechsel sollte gesplittet werden
+        section_types = [c.section_type for c in chunks if c.section_type]
+        
+        # Beide Typen sollten in separaten Chunks sein
+        if len(section_types) >= 2:
+            assert "experience" in section_types or "insight" in section_types
+
+
+class TestGraphSchemaParser:
+    """UT-15: Graph-Schema Parser Tests"""
+    
+    def test_get_typical_edge_experience_to_insight(self):
+        """Typischer Edge von experience zu insight ist 'resulted_in'"""
+        # Lade Schema (falls verfügbar)
+        edge = get_typical_edge_for("experience", "insight")
+        
+        # Sollte entweder 'resulted_in' oder Fallback 'related_to' sein
+        assert edge in ["resulted_in", "related_to"]
+    
+    def test_get_typical_edge_insight_to_decision(self):
+        """Typischer Edge von insight zu decision"""
+        edge = get_typical_edge_for("insight", "decision")
+        
+        # Basierend auf graph_schema.md: foundation_for oder guides
+        assert edge in ["foundation_for", "guides", "related_to"]
+    
+    def test_get_typical_edge_fallback(self):
+        """Fallback auf 'related_to' für unbekannte Typen"""
+        edge = get_typical_edge_for("unknown_type_1", "unknown_type_2")
+        
+        # Fallback sollte immer related_to sein
+        assert edge == "related_to"
+    
+    def test_get_typical_edge_any_target(self):
+        """Fallback auf 'any' Target-Regel"""
+        edge = get_typical_edge_for("experience", "unknown_target")
+        
+        # Sollte Fallback auf "any"-Regel oder "related_to"
+        assert edge is not None
+
+
+class TestAutomaticIntraNoteEdges:
+    """UT-16: Automatische Intra-Note-Edges zwischen Sektionen"""
+    
+    def test_edge_payload_has_section_transition(self):
+        """Edge zwischen Sektionen enthält section_transition Metadaten"""
+        edge = _edge(
+            kind="resulted_in",
+            scope="chunk",
+            source_id="note1#c00",
+            target_id="note1#c01",
+            note_id="note1",
+            extra={
+                "provenance": "rule",
+                "rule_id": "inferred:section_transition",
+                "section_transition": "experience->insight",
+                "is_internal": True
+            }
+        )
+        
+        assert edge["is_internal"] is True
+        assert edge["section_transition"] == "experience->insight"
+        assert edge["provenance"] == "rule"
+    
+    def test_inferred_section_transition_provenance(self):
+        """Provenance 'inferred:section_transition' wird korrekt normalisiert"""
+        prov, hint = normalize_provenance("inferred:section_transition")
+        
+        assert prov == "rule"
+        assert hint == "schema_default"
+
+
+class TestRealWorldScenario:
+    """UT-17: Real-World Szenario - Krebsdiagnose Note"""
+    
+    def test_krebsdiagnose_note_structure(self):
+        """Testet die erwartete Struktur der Krebsdiagnose-Note"""
+        md = """
+## 📖 Diagnose: Glioblastom ^kontext
+
+Nach der Operation gab es ein Diagnose-Gespräch.
+
+## 🎭 Emotions-Check ^emotionen
+
+Ich reagierte mit Zittern am Körper.
+
+## 💡 Lektion ^learning
+> [!section] insight
+
+Ich habe versucht die nächsten Schritte zu durchdenken.
+Meine positive Einstellung hat mir geholfen.
+"""
+        blocks, _ = parse_blocks(md)
+        
+        # Konfiguration wie structured_smart_edges
+        config = {
+            "target": 400,
+            "max": 600,
+            "split_level": 2,
+            "strict_heading_split": False,
+            "enable_smart_edge_allocation": True
+        }
+        
+        chunks = strategy_by_heading(blocks, config, "krebsdiagnose")
+        
+        # Wegen Section-Type-Wechsel (None -> insight) sollte die Lektion
+        # ein separater Chunk sein
+        insight_chunks = [c for c in chunks if c.section_type == "insight"]
+        
+        # Mindestens ein Chunk mit section_type "insight"
+        assert len(insight_chunks) >= 1
+        
+        # Der insight-Chunk sollte den Lektions-Inhalt enthalten
+        insight_text = insight_chunks[0].text
+        assert "durchdenken" in insight_text.lower() or "positive" in insight_text.lower()
+
+
 if __name__ == "__main__":
     pytest.main([__file__, "-v"])