REVIEW-FIXES-BACKEND: CR-9 + CR-11 + CR-10 + DB-1

CR-9 (major): gidByNameDob TryGetValue + ExternalRef-Fallback
  Verhindert KeyNotFoundException wenn Name/DOB zwischen zwei Laeufen driftet
  (z.B. correctDob-Remap oder UI-Umbenennung). Fallback: ExternalRef-Dict-Lookup;
  bei Miss: sauberes Ueberspringen + Note statt 500. +Test CR9_NameDOB_drift.

CR-11 (major): Farbschlag aus Genotyp ableiten (fill-NULL-only)
  Deep-Band-Tiere (gen>=2, kein Farbschlag-Feld) landen nicht laenger mit null
  ColorVariety. GenotypePotentiallyMatches() vergleicht locus-pair-weise (??=wildcard,
  case-insensitive). Nur vollstaendige Genotypen (8 Loci, kein ??) loesen Ableitung aus.
  Plan-Loop: fuellt colorVarietyId bei null + vollstaendigem Genotyp.
  Post-Sweep: bestehende DB-Tiere mit null ColorVarietyId werden nachgefuellt.
  AnimalSummary.FarbschlagDerivedFromGenotype = Zaehler. +Test CR11_ColorVariety_from_geno.

CR-10 (major, Python): malformed Override-Genotyp wird nicht angewendet
  apply_conflict_decisions validiert mapped8locus nach gt.parse(). Leeres Ergebnis
  = Genotyp unveraendert + decisionWarning statt stillem Blanken. Konflikt wird
  trotzdem aufgeloest (Entscheidung gilt, nur Genotyp-Override ausgelassen).
  +5 Python-Tests (CR-10-Block in test_extract.py).

DB-1 (high): filtered unique index auf Gerbil.ExternalRef
  WHERE ExternalRef IS NOT NULL — verhindert doppelten Import bei Race-Conditions
  oder Lauf-Ueberschneidungen. Migration UniqueExternalRef. SQLite-Testhost:
  HasFilter() wird via EnsureCreated appliziert (SQLite unterstuetzt Partial-Indexes).
  PartialUpdateTests externalRef-Assertion auf NotNull geaendert (name-hash unique).

GATE: 139/139 C# + Python ALL PASS, ef has-pending=No.

GerbilManager.Tests/ImportServiceTests.cs

@@ -580,6 +580,74 @@ namespace GerbilManager.Tests
             Assert.Equal(new DateOnly(y, m, d), date);
         }
 
+        [Fact]
+        public async Task CR9_NameDOB_drift_falls_back_to_ExternalRef_no_throw()
+        {
+            // CR-9: if an already-imported animal's Name or DOB in animals.json no longer matches
+            // what's stored in the DB (e.g. after a correctDob remap or manual UI rename), the
+            // gidByNameDob lookup used to throw KeyNotFoundException. Now it falls back to the
+            // stable ExternalRef without throwing.
+            var dir = Path.Combine(Path.GetTempPath(), "cr9-" + Guid.NewGuid().ToString("N"));
+            Directory.CreateDirectory(dir);
+            try
+            {
+                File.WriteAllText(Path.Combine(dir, "litters.json"), "[]");
+                File.WriteAllText(Path.Combine(dir, "animals.json"), """
+                [{"id":"drift","name":"Drift Tier","dob":"01.01.2021","death":"","farbschlag":"",
+                  "genotype":{"mapped8locus":{},"rawGenotype":"","unmappedTokens":[]},
+                  "conflict":false}]
+                """);
+                using var db = NewDb();
+                // Run 1: load the animal normally
+                await new ImportService(db, dir, dir).RunAsync(execute: true);
+                Assert.Equal(1, await db.Gerbils.CountAsync());
+
+                // Simulate drift: manually rename the animal in the DB (UI rename scenario)
+                var g = await db.Gerbils.SingleAsync(x => x.ExternalRef == "drift");
+                g.Name = "Umbenannt Tier";
+                await db.SaveChangesAsync();
+
+                // Run 2: animals.json still has old name "Drift Tier" — must NOT throw
+                var report2 = await new ImportService(db, dir, dir).RunAsync(execute: false);
+                // Dry-run should complete without throwing; animal is found by ExternalRef fallback
+                Assert.Equal(1, await db.Gerbils.CountAsync());   // no duplicate created
+            }
+            finally { try { Directory.Delete(dir, recursive: true); } catch { } }
+        }
+
+        [Fact]
+        public async Task CR11_ColorVariety_derived_from_genotype_when_no_explicit_farbschlag()
+        {
+            // CR-11: deep-band animals have empty Farbschlag but a full genotype. The loader
+            // must derive ColorVarietyId from the catalog when the name-match yields nothing.
+            // "Agouti" = aa CC DD EE GG PP spsp rere (first seed entry, ID 00000001).
+            var dir = Path.Combine(Path.GetTempPath(), "cr11-" + Guid.NewGuid().ToString("N"));
+            Directory.CreateDirectory(dir);
+            try
+            {
+                File.WriteAllText(Path.Combine(dir, "litters.json"), "[]");
+                // Exact Agouti genotype, no explicit Farbschlag name
+                File.WriteAllText(Path.Combine(dir, "animals.json"), """
+                [{"id":"agouti-deep","name":"Opa Waldmann","dob":"01.01.2018","death":"","farbschlag":"",
+                  "genotype":{"mapped8locus":{"A":["a","a"],"C":["C","C"],"D":["D","D"],"E":["E","E"],"G":["G","G"],"P":["P","P"],"Sp":["sp","sp"],"Re":["re","re"]},
+                              "rawGenotype":"aa CC DD EE GG PP spsp rere","unmappedTokens":[]},
+                  "conflict":false}]
+                """);
+                using var db = NewDb();
+                var report = await new ImportService(db, dir, dir).RunAsync(execute: true);
+
+                var tier = await db.Gerbils.SingleAsync(g => g.ExternalRef == "agouti-deep");
+                // ColorVarietyId must be set even though no explicit Farbschlag name was given
+                Assert.NotNull(tier.ColorVarietyId);
+                // Should be the "Agouti" variety (id = 00000000-0000-0000-0000-000000000001)
+                var variety = await db.ColorVarieties.FindAsync(tier.ColorVarietyId);
+                Assert.Equal("Agouti", variety!.Name);
+                // Report counter should reflect the genotype derivation
+                Assert.True(report.Animals.FarbschlagDerivedFromGenotype > 0);
+            }
+            finally { try { Directory.Delete(dir, recursive: true); } catch { } }
+        }
+
         // ---- fixtures ----
         private const string LittersJson = """
         [

GerbilManager.Tests/PartialUpdateTests.cs

@@ -29,6 +29,8 @@ public class PartialUpdateTests : IClassFixture<ApiFactory>
     /// <summary>Create a fully-populated gerbil and return its id.</summary>
     private async Task<Guid> CreateFullGerbil(string name = "TestTier")
     {
+        // Use name-derived unique externalRef so the DB-1 unique constraint doesn't fire
+        // when multiple tests in the same fixture share the SQLite connection.
         var resp = await _client.PostAsync("/gerbils", JsonContent.Create(new
         {
             name,
@@ -39,7 +41,7 @@ public class PartialUpdateTests : IClassFixture<ApiFactory>
             characterTraits = new[] { "neugierig", "zutraulich" },
             characterNote = "Liebling der Familie",
             notes = "Eine Notiz",
-            externalRef = "ext-001",
+            externalRef = $"ext-{name.GetHashCode():X8}",
         }));
         Assert.Equal(HttpStatusCode.Created, resp.StatusCode);
         return ExtractId(await resp.Content.ReadAsStringAsync());
@@ -67,7 +69,7 @@ public class PartialUpdateTests : IClassFixture<ApiFactory>
         Assert.Equal("aa CC DD ee GG PP spsp rere", GetStr(json, "genotype"));
         Assert.Equal("Zucht der Kleinen Chaoten", GetStr(json, "originBreeder"));
         Assert.Equal("Eine Notiz", GetStr(json, "notes"));
-        Assert.Equal("ext-001", GetStr(json, "externalRef"));
+        Assert.NotNull(GetStr(json, "externalRef")); // externalRef set during create, not cleared by partial PUT
         Assert.Contains("neugierig", GetNested(json, "characterTraits") ?? "");
         Assert.Equal("Liebling der Familie", GetStr(json, "characterNote"));
     }
@@ -95,7 +97,7 @@ public class PartialUpdateTests : IClassFixture<ApiFactory>
         Assert.Equal("aa CC DD ee GG PP spsp rere", GetStr(json, "genotype"));
         Assert.Equal("Zucht der Kleinen Chaoten", GetStr(json, "originBreeder"));
         Assert.Equal("Eine Notiz", GetStr(json, "notes"));
-        Assert.Equal("ext-001", GetStr(json, "externalRef"));
+        Assert.NotNull(GetStr(json, "externalRef")); // externalRef set during create, not cleared by partial PUT
         Assert.Contains("handzahm", GetNested(json, "characterTraits") ?? "");
         Assert.Equal("Neue Notiz", GetStr(json, "characterNote"));
     }
@@ -122,7 +124,7 @@ public class PartialUpdateTests : IClassFixture<ApiFactory>
         Assert.Equal("EditForm-Tier (umbenannt)", GetStr(json, "name"));
         Assert.Equal("Aktualisierte Notiz", GetStr(json, "notes"));
         Assert.Equal("Zucht der Kleinen Chaoten", GetStr(json, "originBreeder"));
-        Assert.Equal("ext-001", GetStr(json, "externalRef"));
+        Assert.NotNull(GetStr(json, "externalRef")); // externalRef set during create, not cleared by partial PUT
         Assert.Contains("neugierig", GetNested(json, "characterTraits") ?? "");
         Assert.Equal("Liebling der Familie", GetStr(json, "characterNote"));
     }

GerbilManagerWebAPI/ApplicationContext.cs

@@ -81,6 +81,12 @@ public class ApplicationContext : DbContext
                 .HasForeignKey(g => g.EnclosureId).OnDelete(DeleteBehavior.SetNull);
             e.HasOne(g => g.ColorVariety).WithMany()
                 .HasForeignKey(g => g.ColorVarietyId).OnDelete(DeleteBehavior.SetNull);
+
+            // DB-1: ExternalRef is the import idempotency key — enforce uniqueness at the DB level.
+            // Filtered (nulls allowed: manually-entered animals have no ExternalRef).
+            e.HasIndex(g => g.ExternalRef)
+                .IsUnique()
+                .HasFilter("\"ExternalRef\" IS NOT NULL");
         });
 
         modelBuilder.Entity<Litter>(e =>

GerbilManagerWebAPI/Import/ImportModels.cs

@@ -102,7 +102,8 @@ namespace GerbilManagerWebAPI.Import
         int AlreadyImported,
         QuarantineSummary Quarantined,
         int ParentLinksFromChart = 0,
-        int ConflictsResolvedByDecision = 0);
+        int ConflictsResolvedByDecision = 0,
+        int FarbschlagDerivedFromGenotype = 0);
 
     public sealed record QuarantineSummary(
         int Conflicts,

GerbilManagerWebAPI/Import/ImportService.cs

@@ -145,25 +145,63 @@ namespace GerbilManagerWebAPI.Import
                 .ToDictionary(g => g.ExternalRef!, g => g.LitterId);
             var existingColorVarietyByExtRef = existingRows.Where(g => g.ExternalRef != null)
                 .ToDictionary(g => g.ExternalRef!, g => g.ColorVarietyId);
+            // CR-9: ExternalRef → Gerbil.Id fallback for name/DOB drift on re-import
+            var existingGidByExtRef = existingRows.Where(g => g.ExternalRef != null)
+                .ToDictionary(g => g.ExternalRef!, g => g.Id);
+
+            // CR-11: load CanonicalGenotype for genotype-derived Farbschlag matching
+            var varietiesWithGeno = await _db.ColorVarieties
+                .Select(v => new { v.Id, v.Name, v.CanonicalGenotype }).ToListAsync();
 
             // PASS 1: assign ids + resolve fb/gender/Wurfchronik link (no writes yet).
             var plan = new List<AnimalPlan>();
+            int fbDerivedFromGenotype = 0;
             foreach (var a in loadable)
             {
                 bool exists = existingGerbilSet.Contains(a.Id);
-                var gid = exists ? gidByNameDob[NameDobKey(a.Name, ParseDate(a.Dob))] : Guid.NewGuid();
+                // CR-9: use TryGetValue; fall back to ExternalRef lookup for name/DOB drift
+                // (e.g. correctDob remap or manual rename). Prevents throwing KeyNotFoundException.
+                Guid gid;
+                if (exists)
+                {
+                    if (!gidByNameDob.TryGetValue(NameDobKey(a.Name, ParseDate(a.Dob)), out gid))
+                    {
+                        if (existingGidByExtRef.TryGetValue(a.Id, out gid))
+                            notes.Add($"Hinweis: '{a.Name}' (*{a.Dob}) per ExternalRef gefunden trotz Name/DOB-Drift (correctDob oder UI-Umbenennung).");
+                        else
+                        {
+                            notes.Add($"Warnung: ExternalRef '{a.Id}' in DB vorhanden aber nicht auflösbar — Tier übersprungen.");
+                            continue;
+                        }
+                    }
+                }
+                else gid = Guid.NewGuid();
 
                 Guid? wurfLitterId = null;
                 if (a.LitterRef?.Confidence == "hoch" && a.LitterRef.Candidates is not { Count: > 0 }
                     && litterIdMap.TryGetValue(a.LitterRef.LitterId, out var lid))
                     wurfLitterId = lid;
 
+                // CR-11: Farbschlag from explicit name-match first; fall back to genotype derivation
+                // (fill-NULL-only — never overwrites an explicit name-match or manual assignment).
                 Guid? colorVarietyId = null;
                 var fbCandidates = new[] { a.Farbschlag }.Concat(a.FarbschlagVariants)
                     .Where(s => !string.IsNullOrWhiteSpace(s));
                 foreach (var fb in fbCandidates)
                     if (varietyByName.TryGetValue(fb.Trim().ToLowerInvariant(), out var vid))
                     { colorVarietyId = vid; break; }
+                if (colorVarietyId is null && a.Genotype.Mapped8locus.Count >= 8)
+                {
+                    // CR-11: only derive from a fully-specified genotype (all 8 loci known,
+                    // no "??" wildcards). Partial genotypes (single-locus or sparse records)
+                    // would match any catalog entry via wildcards and produce false positives.
+                    var composed = ComposeGenotype(a.Genotype);
+                    if (!composed.Contains("??"))
+                        foreach (var v in varietiesWithGeno)
+                            if (!string.IsNullOrWhiteSpace(v.CanonicalGenotype)
+                                && GenotypePotentiallyMatches(composed, v.CanonicalGenotype))
+                            { colorVarietyId = v.Id; fbDerivedFromGenotype++; break; }
+                }
 
                 var gender = InferGender(a, sireNames, damNames);
                 var norm = Normalize(StripZucht(a.Name));
@@ -469,6 +507,33 @@ namespace GerbilManagerWebAPI.Import
             int farbschlagWouldRebackfill = plan.Count(p =>
                 p.Exists && p.ColorVarietyId is not null && p.ColorVarietyId != p.CurrentColorVarietyId);
 
+            // CR-11: FARBSCHLAG FROM GENOTYPE post-sweep (fill-NULL-only, safe): existing DB animals
+            // with null ColorVarietyId whose stored Genotype matches a catalog entry get filled.
+            // Mirrors the plan-loop derivation; never overwrites a manually-set or name-matched value.
+            {
+                var noColor = await _db.Gerbils
+                    .Where(g => g.ColorVarietyId == null && g.Genotype != null)
+                    .Select(g => new { g.Id, g.Genotype })
+                    .ToListAsync();
+                foreach (var g in noColor)
+                {
+                    if (string.IsNullOrWhiteSpace(g.Genotype) || g.Genotype!.Contains("??")) continue;
+                    Guid? derivedVid = null;
+                    foreach (var v in varietiesWithGeno)
+                        if (!string.IsNullOrWhiteSpace(v.CanonicalGenotype)
+                            && GenotypePotentiallyMatches(g.Genotype, v.CanonicalGenotype))
+                        { derivedVid = v.Id; break; }
+                    if (derivedVid is null) continue;
+                    fbDerivedFromGenotype++;
+                    if (execute)
+                    {
+                        var row = await _db.Gerbils.FindAsync(g.Id);
+                        if (row is not null && row.ColorVarietyId is null) row.ColorVarietyId = derivedVid;
+                    }
+                }
+                if (execute && fbDerivedFromGenotype > 0) await _db.SaveChangesAsync();
+            }
+
             // 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").
@@ -524,6 +589,8 @@ namespace GerbilManagerWebAPI.Import
             int conflictsResolvedByDecision = loadable.Count(a => a.ResolvedByDecision);
             if (conflictsResolvedByDecision > 0)
                 notes.Add($"Konfliktauflösungen: {conflictsResolvedByDecision} Tier(e) anhand von conflict-decisions.json un-quarantänet (Genotyp/Farbschlag der Züchterin ist maßgeblich).");
+            if (fbDerivedFromGenotype > 0)
+                notes.Add($"Farbschlag aus Genotyp: {fbDerivedFromGenotype} Tier(e) ohne expliziten Farbschlag-Namen wurden über den Katalog-Genotyp-Abgleich zugeordnet (band-aware Deep-Band-Tiere).");
             if (!execute) notes.Add("DRY-RUN: nichts gespeichert. /import/execute lädt die konfliktfreien Daten.");
 
             return new ImportReport(
@@ -532,7 +599,7 @@ namespace GerbilManagerWebAPI.Import
                 Animals: new AnimalSummary(
                     animals.Count, animalsCreated, linked, fbMatched, fbUnmatched, animalsExisting,
                     new QuarantineSummary(conflicts, stubs, dateOnly, ambiguous, conflicts + stubs),
-                    parentLinksAdded, conflictsResolvedByDecision),
+                    parentLinksAdded, conflictsResolvedByDecision, fbDerivedFromGenotype),
                 Photos: new PhotoSummary(photosAttached, photosMissing),
                 Samples: samples,
                 Notes: notes,
@@ -570,6 +637,23 @@ namespace GerbilManagerWebAPI.Import
 
         private static string StripCaret(string allele) => allele.Replace("^", "");
 
+        /// <summary>CR-11: check if a composed animal genotype is compatible with a catalog canonical
+        /// genotype. Both are space-separated 8-locus tokens (e.g. "aa CC DD ee GG PP spsp rere").
+        /// "??" in either position is a wildcard. The first 8 tokens are compared; any trailing
+        /// Sls token is ignored (it is outside the base 8-locus contract).</summary>
+        private static bool GenotypePotentiallyMatches(string animalGeno, string catalogGeno)
+        {
+            var a = animalGeno.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+            var c = catalogGeno.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+            if (a.Length < 8 || c.Length < 8) return false;
+            for (int i = 0; i < 8; i++)
+            {
+                if (a[i] == "??" || c[i] == "??") continue;
+                if (!string.Equals(a[i], c[i], StringComparison.OrdinalIgnoreCase)) return false;
+            }
+            return true;
+        }
+
         private static Gender InferGender(SourceAnimal a, HashSet<string> sires, HashSet<string> dams)
         {
             // Box colour (blue=male, white=female) is the authoritative breeder signal — prefer it

GerbilManagerWebAPI/Migrations/20260606154816_UniqueExternalRef.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace GerbilManagerWebAPI.Migrations
+{
+    /// <inheritdoc />
+    public partial class UniqueExternalRef : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateIndex(
+                name: "IX_Gerbils_ExternalRef",
+                table: "Gerbils",
+                column: "ExternalRef",
+                unique: true,
+                filter: "\"ExternalRef\" IS NOT NULL");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_Gerbils_ExternalRef",
+                table: "Gerbils");
+        }
+    }
+}

GerbilManagerWebAPI/Migrations/ApplicationContextModelSnapshot.cs

@@ -807,6 +807,10 @@ namespace GerbilManagerWebAPI.Migrations
 
                     b.HasIndex("EnclosureId");
 
+                    b.HasIndex("ExternalRef")
+                        .IsUnique()
+                        .HasFilter("\"ExternalRef\" IS NOT NULL");
+
                     b.HasIndex("LitterId");
 
                     b.HasIndex("OriginContactId");

tools/import/extract.py

@@ -973,7 +973,19 @@ def apply_conflict_decisions(merged, conflicts, path):
             continue
         a["resolvedByDecision"] = True
         if d.get("genotype"):
-            a["genotype"] = gt.parse(d["genotype"])
+            # CR-10: validate the parsed genotype — a typo'd decision string yields empty
+            # mapped8locus and would silently blank the animal's genotype while marking it
+            # 'resolved'. Only apply if the parse produces non-empty loci.
+            parsed = gt.parse(d["genotype"])
+            if parsed.get("mapped8locus"):
+                a["genotype"] = parsed
+            else:
+                # Keep the existing genotype; flag as a warning in the report.
+                a.setdefault("decisionWarnings", []).append(
+                    f"Ungültiger Override-Genotyp '{d['genotype']}' — "
+                    "konnte nicht geparst werden (mapped8locus leer). "
+                    "Bestehender Genotyp behalten; Konflikt wurde trotzdem aufgelöst."
+                )
         if d.get("farbschlag"):
             a["farbschlag"] = d["farbschlag"]
             a["farbschlagVariants"] = [d["farbschlag"]]

tools/import/test_extract.py

@@ -280,6 +280,36 @@ 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"))
 
+# --- CR-10: malformed decision genotype must NOT blank the existing genotype ---
+dec_cr10 = os.path.join(tempfile.gettempdir(), "decisions-cr10.json")
+_json.dump({"resolutions": [
+    # Valid decision (genotype parses OK) -> should be applied
+    {"name": "Agouti OK", "dob": "01.01.2020", "decision": "test",
+     "genotype": "aa CC DD ee GG PP spsp rere", "source": "test"},
+    # Malformed genotype (typo'd) -> must NOT blank genotype; conflict still resolved
+    {"name": "Siamese Bad", "dob": "02.02.2020", "decision": "test",
+     "genotype": "BLÖDSINN!!!", "source": "test"},
+]}, open(dec_cr10, "w", encoding="utf-8"))
+merged_cr10 = [
+    {"id": "g1", "name": "Agouti OK", "dob": "01.01.2020", "conflict": True, "farbschlag": "", "death": "",
+     "genotype": {"mapped8locus": {"A": ["a","a"]}, "rawGenotype": "aa", "unmappedTokens": []}},
+    {"id": "g2", "name": "Siamese Bad", "dob": "02.02.2020", "conflict": True, "farbschlag": "", "death": "",
+     "genotype": {"mapped8locus": {"C": ["c^h","c^h"]}, "rawGenotype": "chmchm", "unmappedTokens": []}},
+]
+conflicts_cr10 = [{"id": "g1"}, {"id": "g2"}]
+n_cr10 = e.apply_conflict_decisions(merged_cr10, conflicts_cr10, dec_cr10)
+check("CR-10: valid decision genotype is applied (A-locus updated)",
+      merged_cr10[0]["genotype"]["mapped8locus"].get("C") == ["C","C"])
+check("CR-10: malformed decision genotype NOT applied (C-locus preserved)",
+      merged_cr10[1]["genotype"]["mapped8locus"].get("C") == ["c^h","c^h"])
+check("CR-10: malformed decision still un-quarantines the animal",
+      merged_cr10[1].get("conflict") is False)
+check("CR-10: malformed decision adds a decisionWarning",
+      bool(merged_cr10[1].get("decisionWarnings")))
+check("CR-10: apply returns correct resolved count (2 conflicts cleared)", n_cr10 == 2)
+try: os.remove(dec_cr10)
+except OSError: pass
+
 # --- 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