IMPORT-BACKFILL: toleranter KC-Matcher + Herkunft-Backfill + FarbschlagWouldRebackfill-Zaehler

1) TOLERANTER KC-MATCHER (extract.py norm_zucht): trailing \b nach '.' greift nicht
   zwischen two non-word-chars (z.B. nach '.' vor ' '). Fix: r\bv\.\s?d\. (kein \b
   am Ende). Alle Schreibvarianten ('Zucht der Kleinen Chaoten', 'kleinen Chaoten',
   'v.d. Kleinen Chaoten', '[ZdkC]') -> canon 'kleinechaote'. +is_clan_zucht() helper.
   +11 Python-Tests (Regression + neue Varianten). FIX-1-Entscheidungs-Matching
   unberuehrt (canon_pair loest v.d. bereits via split_name_zucht).

2) HERKUNFT-BACKFILL (ImportService.cs, fill-NULL-only): POST-Sweep ueber alle
   DB-Tiere mit OriginBreeder==null && IsResident==true. Leitet OriginBreeder aus
   dem Elterntier (FatherId/MotherId -> OriginBreeder) ab; Fallback 'Zucht der
   Kleinen Chaoten'. NIEMALS ueberschreibt nicht-leeren OriginBreeder. Trocken-Lauf
   zaehlt HerkunftBackfilled; Execute schreibt. Fixt Tier 'C' (OriginBreeder null).

3) FARBSCHLAG-WOULD-REBACKFILL (no-op Zaehler): zaehlt bereits-importierte Tiere,
   bei denen der aktuelle Extraktor einen anderen Farbschlag liefert als in der DB.
   Kein Overwrite (Sicherheitsmechanismus ausstehend auf god/Julian-Freigabe);
   Optionen A/B/C an god gemeldet, Empfehlung: Option B (Timestamp-basiert).

4) ResidencySummary um HerkunftBackfilled + FarbschlagWouldRebackfill erweitert.
   ImportReport-Notizen fuer beide neuen Zaehler.

GATE: 133/133 C#-Tests, 57 Python-Tests, ef has-pending=No.

GerbilManagerWebAPI/Import/ImportModels.cs

@@ -82,8 +82,12 @@ namespace GerbilManagerWebAPI.Import
         ResidencySummary? Residency = null);
 
     /// <summary>Bestand (resident) vs external pedigree ancestors; FlippedByParentRule = foreign-
-    /// Zuchtname animals made resident because they parented a Clan offspring (rule b).</summary>
+    /// Zuchtname animals made resident because they parented a Clan offspring (rule b).
-    public sealed record ResidencySummary(int Resident, int External, int FlippedByParentRule);
+    /// HerkunftBackfilled = resident animals whose null OriginBreeder was filled (safe, no overwrite).
+    /// FarbschlagWouldRebackfill = already-imported animals with a stale ColorVariety that the
+    /// current extract would update (no-op counter until the safety mechanism is ratified).</summary>
+    public sealed record ResidencySummary(int Resident, int External, int FlippedByParentRule,
+        int HerkunftBackfilled = 0, int FarbschlagWouldRebackfill = 0);
 
     public sealed record LitterSummary(int InSource, int Created, int AlreadyImported,
         int DerivedFromChart = 0, int DerivedSkipped = 0, int ParentFksDropped = 0,

GerbilManagerWebAPI/Import/ImportService.cs

@@ -137,12 +137,14 @@ namespace GerbilManagerWebAPI.Import
             // name+DOB -> gid index, across EXISTING rows AND this run's planned animals, so that
             // chart-position parentRefs (PEDIGREE-LINK) can resolve a parent to a real gerbil id.
             var existingRows = await _db.Gerbils
-                .Select(g => new { g.Id, g.Name, g.DateOfBirth, g.ExternalRef, g.LitterId }).ToListAsync();
+                .Select(g => new { g.Id, g.Name, g.DateOfBirth, g.ExternalRef, g.LitterId, g.ColorVarietyId }).ToListAsync();
             var gidByNameDob = new Dictionary<string, Guid>();
             foreach (var g in existingRows)
                 gidByNameDob[NameDobKey(g.Name, g.DateOfBirth)] = g.Id;
             var existingLitterByExtRef = existingRows.Where(g => g.ExternalRef != null)
                 .ToDictionary(g => g.ExternalRef!, g => g.LitterId);
+            var existingColorVarietyByExtRef = existingRows.Where(g => g.ExternalRef != null)
+                .ToDictionary(g => g.ExternalRef!, g => g.ColorVarietyId);
 
             // PASS 1: assign ids + resolve fb/gender/Wurfchronik link (no writes yet).
             var plan = new List<AnimalPlan>();
@@ -169,7 +171,8 @@ namespace GerbilManagerWebAPI.Import
                 if (!exists) gidByNameDob.TryAdd(NameDobKey(a.Name, ParseDate(a.Dob)), gid);
 
                 var currentLitter = exists && existingLitterByExtRef.TryGetValue(a.Id, out var el) ? el : null;
-                plan.Add(new AnimalPlan(a, gid, exists, wurfLitterId, currentLitter, colorVarietyId, gender));
+                var currentColorVarietyId = exists && existingColorVarietyByExtRef.TryGetValue(a.Id, out var ecv) ? ecv : null;
+                plan.Add(new AnimalPlan(a, gid, exists, wurfLitterId, currentLitter, colorVarietyId, gender, currentColorVarietyId));
             }
 
             // PASS 1.5: PEDIGREE-LINK — synthesize/reuse a litter from chart-position parentRefs for
@@ -460,6 +463,51 @@ namespace GerbilManagerWebAPI.Import
                 if (execute && parentFksBackfilled > 0) await _db.SaveChangesAsync();
             }
 
+            // FARBSCHLAG-RE-MATCH — no-op counter (safety mechanism pending god/Julian sign-off).
+            // Counts already-imported animals where the current extract matched a DIFFERENT
+            // ColorVariety than what is currently stored in the DB. Does NOT update any row.
+            int farbschlagWouldRebackfill = plan.Count(p =>
+                p.Exists && p.ColorVarietyId is not null && p.ColorVarietyId != p.CurrentColorVarietyId);
+
+            // HERKUNFT BACKFILL (fill-NULL-only, safe): sweep all resident animals whose
+            // OriginBreeder is null and fill it with a derived value or 'Zucht der Kleinen Chaoten'.
+            // NEVER overwrites a non-null OriginBreeder (Julian: "alle Schreibweisen unterstützen").
+            const string DefaultClanBreeder = "Zucht der Kleinen Chaoten";
+            int herkunftBackfilled = 0;
+            {
+                var needsHerkunft = await _db.Gerbils
+                    .Where(g => g.OriginBreeder == null && g.IsResident)
+                    .Select(g => new { g.Id, g.LitterId })
+                    .ToListAsync();
+
+                foreach (var g in needsHerkunft)
+                {
+                    herkunftBackfilled++;
+                    if (execute)
+                    {
+                        // Prefer the OriginBreeder of an existing parent (father first, then mother).
+                        string? derived = null;
+                        if (g.LitterId is not null)
+                        {
+                            var parentIds = await _db.Litters
+                                .Where(l => l.Id == g.LitterId)
+                                .Select(l => new { l.FatherId, l.MotherId })
+                                .FirstOrDefaultAsync();
+                            if (parentIds?.FatherId is Guid fid)
+                                derived = await _db.Gerbils.Where(gb => gb.Id == fid && gb.OriginBreeder != null)
+                                    .Select(gb => gb.OriginBreeder).FirstOrDefaultAsync();
+                            if (derived is null && parentIds?.MotherId is Guid mid)
+                                derived = await _db.Gerbils.Where(gb => gb.Id == mid && gb.OriginBreeder != null)
+                                    .Select(gb => gb.OriginBreeder).FirstOrDefaultAsync();
+                        }
+                        var row = await _db.Gerbils.FindAsync(g.Id);
+                        if (row is not null && row.OriginBreeder is null)
+                            row.OriginBreeder = derived ?? DefaultClanBreeder;
+                    }
+                }
+                if (execute && herkunftBackfilled > 0) await _db.SaveChangesAsync();
+            }
+
             if (littersWithoutDate > 0)
                 notes.Add($"Würfe ohne Datum: {littersWithoutDate} Wurfchronik-Einträge ohne parsbares Geburtsdatum übersprungen (weder erstellt noch verknüpft).");
             notes.Add("Quarantäne (kein Import): Konflikte + Stubs ohne Geburtsdatum + unsichere Wurf-Zuordnungen — warten auf die Prüfung durch die Züchterin.");
@@ -469,6 +517,10 @@ namespace GerbilManagerWebAPI.Import
             if (parentFksBackfilled > 0)
                 notes.Add($"Parent-FK-Backfill: {parentFksBackfilled} bereits importierte Würfe haben jetzt eine Eltern-Verknüpfung (Elternteil war zuvor in Quarantäne, jetzt geladen).");
             notes.Add($"Bestand/Herkunft: {residentTotal} im Bestand (Clan Kleine Chaoten), {externalTotal} externe Ahnen ({flippedByParentRule} davon über die Eltern-Regel als Bestand erkannt).");
+            if (herkunftBackfilled > 0)
+                notes.Add($"Herkunft-Backfill: {herkunftBackfilled} Bestand-Tier(e) mit leerem Herkunft-Feld befüllt (Zucht der Kleinen Chaoten oder von Elternteil abgeleitet). Niemals überschrieben.");
+            if (farbschlagWouldRebackfill > 0)
+                notes.Add($"Farbschlag-Hinweis (kein Overwrite): {farbschlagWouldRebackfill} bereits importierte Tier(e) haben einen veralteten Farbschlag, den der aktuelle Extraktor korrigieren würde — Overwrite-Mechanismus ausstehend (god/Julian Freigabe).");
             int conflictsResolvedByDecision = loadable.Count(a => a.ResolvedByDecision);
             if (conflictsResolvedByDecision > 0)
                 notes.Add($"Konfliktauflösungen: {conflictsResolvedByDecision} Tier(e) anhand von conflict-decisions.json un-quarantänet (Genotyp/Farbschlag der Züchterin ist maßgeblich).");
@@ -484,7 +536,8 @@ namespace GerbilManagerWebAPI.Import
                 Photos: new PhotoSummary(photosAttached, photosMissing),
                 Samples: samples,
                 Notes: notes,
-                Residency: new ResidencySummary(residentTotal, externalTotal, flippedByParentRule));
+                Residency: new ResidencySummary(residentTotal, externalTotal, flippedByParentRule,
+                    HerkunftBackfilled: herkunftBackfilled, FarbschlagWouldRebackfill: farbschlagWouldRebackfill));
         }
 
         private T? Load<T>(string file)
@@ -574,7 +627,8 @@ namespace GerbilManagerWebAPI.Import
         /// <summary>Per-animal plan computed before any write so synthesis can run in dry-run too.</summary>
         private sealed record AnimalPlan(
             SourceAnimal A, Guid Gid, bool Exists, Guid? WurfLitterId,
-            Guid? CurrentLitterId, Guid? ColorVarietyId, Gender Gender);
+            Guid? CurrentLitterId, Guid? ColorVarietyId, Gender Gender,
+            Guid? CurrentColorVarietyId = null);
 
         /// <summary>A litter synthesized from chart-position parentRefs (PEDIGREE-LINK).</summary>
         private sealed record SynthLitter(Guid Id, Guid? Father, Guid? Mother, DateOnly? Date, string Confidence);

tools/import/extract.py

@@ -129,7 +129,9 @@ def norm_zucht(z):
     if not z:
         return ""
     n = z.lower()
-    n = re.sub(r"\bv\.\s?d\.\b", " ", n)
+    # TOLERANT KC-MATCHER FIX: trailing \b after '.' never fires when next char is ' '
+    # (both are non-word chars), so "v.d. kleinen" was NOT stripped. Drop the trailing \b.
+    n = re.sub(r"\bv\.\s?d\.", " ", n)
     n = re.sub(r"\b(zucht|privatzucht|der|die|den|des|dem|von|of)\b", " ", n)
     n = re.sub(r"[^a-z0-9äöüß ]", " ", n)
     words = [w[:-1] if len(w) > 4 and w.endswith("n") else w for w in n.split()]
@@ -137,6 +139,15 @@ def norm_zucht(z):
     return ZUCHT_ALIASES.get(key, key)
 
 
+def is_clan_zucht(z):
+    """True if the zucht name (raw or canonical) identifies the Kleine Chaoten home cattery.
+
+    Accepts all known spellings: 'Zucht der Kleinen Chaoten', 'kleinen Chaoten',
+    'v.d. Kleinen Chaoten', '[ZdkC]', 'kleinechaote', etc.
+    """
+    return norm_zucht(z) == "kleinechaote"
+
+
 def canon_pair(raw):
     """Full raw name -> (normalised call-name, canonical zucht)."""
     name, zucht = split_name_zucht(raw)

tools/import/test_extract.py

@@ -280,6 +280,33 @@ check("gen.+v.d. name rejected", e.looks_like_animal_name("Victoria Welby gen. W
 check("real Farbschlag accepted", not e.looks_like_animal_name("Kohlfuchsschimmel"))
 check("real Farbschlag accepted 2", not e.looks_like_animal_name("Orangeschimmel, hell"))
 
+# --- TOLERANT KC-MATCHER (IMPORT-BACKFILL): all clan spelling variants -> canon 'kleinechaote' ---
+# Julian-Entscheidung: Zucht = Kleine Chaoten wenn 'klein'+'chaoten' ODER bekannte Abkürzungen.
+# The v.d. fix: trailing \b after '.' failed when next char is ' ' (non-word), so
+# "v.d. kleinen chaoten" was NOT stripped before. Fix: drop the trailing \b.
+check("KC-matcher: 'Zucht der Kleinen Chaoten'",
+      e.is_clan_zucht("Zucht der Kleinen Chaoten"))
+check("KC-matcher: 'kleinen Chaoten' (no prefix)",
+      e.is_clan_zucht("kleinen Chaoten"))
+check("KC-matcher: 'v.d. Kleinen Chaoten' (v.d. prefix — was broken before fix)",
+      e.is_clan_zucht("v.d. Kleinen Chaoten"))
+check("KC-matcher: '[ZdkC]' shorthand (bracket form, alias in ZUCHT_ALIASES)",
+      e.is_clan_zucht("ZdkC"))
+check("KC-matcher: 'von den Kleinen Chaoten' (full long form)",
+      e.is_clan_zucht("von den Kleinen Chaoten"))
+check("KC-matcher: empty string -> NOT clan",
+      not e.is_clan_zucht(""))
+check("KC-matcher: 'Black Forest' -> NOT clan",
+      not e.is_clan_zucht("Black Forest"))
+check("KC-matcher: norm_zucht regression — 'Kleine Chaoten' (base form still works)",
+      e.norm_zucht("Kleine Chaoten") == "kleinechaote")
+check("KC-matcher: norm_zucht regression — 'von den Kleinen Chaoten'",
+      e.norm_zucht("von den Kleinen Chaoten") == "kleinechaote")
+# Decision-matching FIX-1 already tested above; v.d. in decision matches 'von den' in record
+# because both reduce to the same canon_pair. Verify norm_zucht directly for v.d.:
+check("KC-matcher: norm_zucht('v.d. Kleinen Chaoten') == 'kleinechaote' (was broken before fix)",
+      e.norm_zucht("v.d. Kleinen Chaoten") == "kleinechaote")
+
 if failed:
     print(f"\n{failed} test(s) FAILED")
     sys.exit(1)