feat: Fehler-melden + Datenherkunft auf Kontakte & Würfe erweitern

- Kontakt-Detailseite: „Fehler melden"- und „Datenherkunft"-Button.
- Wurf-Ansicht: „Datenherkunft"-Button (Feedback war bereits vorhanden).
- Feedback-Entity um loses, nullable ContactId erweitert (kein FK → übersteht
  Ingest-Wipe); Migration AddFeedbackContactId.
- Contact.Provenance + Litter.Provenance (nullable text); Migration
  AddContactLitterProvenance; im Ingest gemappt und in den DTOs zurückgegeben.
- Import: build_entity_provenance() generalisiert; Kontakte (sourceFiles,
  Züchter/Abnehmer-Hinweise) und Würfe (Wurfchronik vs. Diagramm-rekonstruiert,
  Geschwister-Merge) erhalten Herkunftsdaten in resolved_import.json.
- Frontend: ProvenanceDialog generalisiert (EntityProvenance + entityLabel).

Tests erweitert (Ingest-Round-trip Kontakt/Wurf, contact-scoped Feedback
übersteht Wipe). dotnet(212)/vitest(129)/playwright(36)/tsc/eslint grün.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

GerbilManager.Tests/FeedbackEndpointTests.cs

@@ -75,7 +75,7 @@ public class FeedbackEndpointTests : IClassFixture<ApiFactory>
             {
                 Contacts = new[]
                 {
-                    new { Id = contactId, Name = "Test Breeder", Email = "t@e.de", Phone = "", Address = "", Notes = (string?)null, IsBreeder = true, IsReceiver = false }
+                    new { Id = contactId, Name = "Test Breeder", Email = "t@e.de", Phone = "", Address = "", Notes = (string?)null, IsBreeder = true, IsReceiver = false, NameSuffix = (string?)null, Provenance = (string?)null }
                 },
                 Litters = new[]
                 {
@@ -109,6 +109,19 @@ public class FeedbackEndpointTests : IClassFixture<ApiFactory>
                 Url = "http://localhost/rennmaeuse/papa",
                 CreatedAt = DateTimeOffset.UtcNow,
             });
+            // A contact-scoped feedback report — the ContactId is a loose (FK-free) id,
+            // so it must survive the contact-table wipe just like gerbil/litter ids.
+            var contactFeedbackId = Guid.NewGuid();
+            db.Feedback.Add(new Feedback
+            {
+                Id = contactFeedbackId,
+                Message = "Adresse stimmt nicht.",
+                Context = "contact-detail",
+                ContactId = contactId,
+                EntityName = "Test Breeder",
+                Url = "http://localhost/kontakte/test-breeder",
+                CreatedAt = DateTimeOffset.UtcNow,
+            });
             await db.SaveChangesAsync();
 
             var config = new ConfigurationBuilder()
@@ -119,12 +132,18 @@ public class FeedbackEndpointTests : IClassFixture<ApiFactory>
             var result = await new IngestResolvedService(db, config, null!).RunAsync();
             Assert.Contains("Ingestion successful!", result);
 
-            // Gerbils/litters were wiped & re-created, but feedback is untouched.
-            var survivor = await db.Feedback.SingleAsync();
-            Assert.Equal(feedbackId, survivor.Id);
+            // Gerbils/litters/contacts were wiped & re-created, but feedback is untouched.
+            var survivor = await db.Feedback.SingleAsync(f => f.Id == feedbackId);
             Assert.Equal(fatherId, survivor.GerbilId);   // loose id preserved even though the gerbil row was deleted/recreated
             Assert.Equal(litterId, survivor.LitterId);
             Assert.Equal("Papa", survivor.EntityName);
+
+            // The contact-scoped report also survives the contacts wipe (loose ContactId).
+            var contactSurvivor = await db.Feedback.SingleAsync(f => f.Id == contactFeedbackId);
+            Assert.Equal(contactId, contactSurvivor.ContactId);
+            Assert.Equal("contact-detail", contactSurvivor.Context);
+            Assert.Equal("Test Breeder", contactSurvivor.EntityName);
+            Assert.Equal(2, await db.Feedback.CountAsync());
         }
         finally
         {

GerbilManager.Tests/IngestResolvedServiceTests.cs

@@ -36,7 +36,8 @@ namespace GerbilManager.Tests
                         Email = "test@example.com",
                         Homepage = "",
                         Phone = "",
-                        Address = ""
+                        Address = "",
+                        Provenance = (string?)"{\"sourceFiles\":[\"Stammbaum\"],\"mergedRecordCount\":1,\"notes\":[\"als Züchter erkannt\"]}"
                     }
                 },
                 Litters = new[]
@@ -54,7 +55,8 @@ namespace GerbilManager.Tests
                         Notes = "Test litter notes",
                         PairingCode = "PC01",
                         ExternalRef = "ext-litter-1",
-                        LitterLetter = "A"
+                        LitterLetter = "A",
+                        Provenance = (string?)"{\"sourceFiles\":[\"Wurfchronik-Detail.docx\"],\"mergedRecordCount\":1,\"fromWurfchronik\":true,\"notes\":[\"aus Wurfchronik\"]}"
                     }
                 },
                 Gerbils = new[]
@@ -184,6 +186,15 @@ namespace GerbilManager.Tests
             Assert.Contains("Stammbaum von Papa.xlsx", father.Provenance);
             Assert.Contains("mergedRecordCount", father.Provenance);
             Assert.Null(mother.Provenance);
+
+            // Contact + litter provenance also round-trips through the ingest.
+            var contact = await db.Contacts.SingleAsync();
+            Assert.NotNull(contact.Provenance);
+            Assert.Contains("als Züchter erkannt", contact.Provenance);
+
+            Assert.NotNull(litter.Provenance);
+            Assert.Contains("aus Wurfchronik", litter.Provenance);
+            Assert.Contains("fromWurfchronik", litter.Provenance);
         }
     }
 }

GerbilManagerWebAPI/Dtos/ApiDtos.cs

@@ -44,9 +44,10 @@ namespace GerbilManagerWebAPI.Dtos
         Guid? FatherId,
         Guid? MotherId,
         DateOnly? ExpectedGoHomeDate,
-        string? Notes);
+        string? Notes,
+        string? Provenance);
 
-    public record ContactDto(Guid Id, string Name, string? Email, string? Phone, string? Address, string? Notes, bool IsBreeder, bool IsReceiver, string? NameSuffix);
+    public record ContactDto(Guid Id, string Name, string? Email, string? Phone, string? Address, string? Notes, bool IsBreeder, bool IsReceiver, string? NameSuffix, string? Provenance);
 
     public record EnclosureDto(Guid Id, string Name, string? Notes);
 

GerbilManagerWebAPI/Dtos/FeedbackDtos.cs

@@ -6,6 +6,7 @@ namespace GerbilManagerWebAPI.Dtos
         string Context,
         Guid? GerbilId,
         Guid? LitterId,
+        Guid? ContactId,
         string? EntityName,
         string? Url,
         DateTimeOffset? ClientTimestamp);
@@ -17,6 +18,7 @@ namespace GerbilManagerWebAPI.Dtos
         string Context,
         Guid? GerbilId,
         Guid? LitterId,
+        Guid? ContactId,
         string? EntityName,
         string? Url,
         DateTimeOffset? ClientTimestamp,

GerbilManagerWebAPI/Endpoints/ContactEndpoints.cs

@@ -55,6 +55,6 @@ namespace GerbilManagerWebAPI.Endpoints
             return app;
         }
 
-        private static ContactDto ToDto(Contact c) => new(c.Id, c.Name, c.Email, c.Phone, c.Address, c.Notes, c.IsBreeder, c.IsReceiver, c.NameSuffix);
+        private static ContactDto ToDto(Contact c) => new(c.Id, c.Name, c.Email, c.Phone, c.Address, c.Notes, c.IsBreeder, c.IsReceiver, c.NameSuffix, c.Provenance);
     }
 }

GerbilManagerWebAPI/Endpoints/FeedbackEndpoints.cs

@@ -31,6 +31,7 @@ namespace GerbilManagerWebAPI.Endpoints
                     Context = string.IsNullOrWhiteSpace(input.Context) ? "unknown" : input.Context.Trim(),
                     GerbilId = input.GerbilId,
                     LitterId = input.LitterId,
+                    ContactId = input.ContactId,
                     EntityName = input.EntityName,
                     Url = input.Url,
                     ClientTimestamp = input.ClientTimestamp,
@@ -56,7 +57,7 @@ namespace GerbilManagerWebAPI.Endpoints
         }
 
         private static FeedbackDto ToDto(Feedback f) =>
-            new(f.Id, f.Message, f.Context, f.GerbilId, f.LitterId, f.EntityName, f.Url,
+            new(f.Id, f.Message, f.Context, f.GerbilId, f.LitterId, f.ContactId, f.EntityName, f.Url,
                 f.ClientTimestamp, f.UserAgent, f.CreatedAt);
     }
 }

GerbilManagerWebAPI/Endpoints/LitterEndpoints.cs

@@ -98,7 +98,7 @@ namespace GerbilManagerWebAPI.Endpoints
 
         private static LitterDto ToDto(Litter l) => new(
             l.Id, l.Name, l.Date, l.TotalBorn, l.DeathsWithin8Weeks,
-            l.FatherId, l.MotherId, l.ExpectedGoHomeDate, l.Notes);
+            l.FatherId, l.MotherId, l.ExpectedGoHomeDate, l.Notes, l.Provenance);
     }
 
     /// <summary>400 body for a father×mother gender mismatch; frontend localises by Code.</summary>

GerbilManagerWebAPI/Import/IngestResolvedService.cs

@@ -103,6 +103,8 @@ namespace GerbilManagerWebAPI.Import
                     existingContact.Notes = c.Notes;
                     existingContact.IsBreeder = c.IsBreeder;
                     existingContact.IsReceiver = c.IsReceiver;
+                    existingContact.NameSuffix = c.NameSuffix;
+                    existingContact.Provenance = c.Provenance;
                     contactsUpdated++;
                 }
                 else if (addedContactIds.Add(c.Id))
@@ -130,7 +132,8 @@ namespace GerbilManagerWebAPI.Import
                     Notes = l.Notes,
                     PairingCode = l.PairingCode,
                     ExternalRef = l.ExternalRef,
-                    LitterLetter = l.LitterLetter
+                    LitterLetter = l.LitterLetter,
+                    Provenance = l.Provenance
                 });
             }
             _db.Litters.AddRange(littersToInsert);

GerbilManagerWebAPI/Migrations/20260622135306_AddFeedbackContactId.cs

@@ -0,0 +1,29 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace GerbilManagerWebAPI.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddFeedbackContactId : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<Guid>(
+                name: "ContactId",
+                table: "Feedback",
+                type: "uuid",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "ContactId",
+                table: "Feedback");
+        }
+    }
+}

GerbilManagerWebAPI/Migrations/20260622135338_AddContactLitterProvenance.cs

@@ -0,0 +1,38 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace GerbilManagerWebAPI.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddContactLitterProvenance : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "Provenance",
+                table: "Litters",
+                type: "text",
+                nullable: true);
+
+            migrationBuilder.AddColumn<string>(
+                name: "Provenance",
+                table: "Contacts",
+                type: "text",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "Provenance",
+                table: "Litters");
+
+            migrationBuilder.DropColumn(
+                name: "Provenance",
+                table: "Contacts");
+        }
+    }
+}

GerbilManagerWebAPI/Migrations/ApplicationContextModelSnapshot.cs

@@ -741,6 +741,9 @@ namespace GerbilManagerWebAPI.Migrations
                     b.Property<string>("Phone")
                         .HasColumnType("text");
 
+                    b.Property<string>("Provenance")
+                        .HasColumnType("text");
+
                     b.HasKey("Id");
 
                     b.ToTable("Contacts");
@@ -802,6 +805,9 @@ namespace GerbilManagerWebAPI.Migrations
                     b.Property<DateTimeOffset?>("ClientTimestamp")
                         .HasColumnType("timestamp with time zone");
 
+                    b.Property<Guid?>("ContactId")
+                        .HasColumnType("uuid");
+
                     b.Property<string>("Context")
                         .IsRequired()
                         .HasColumnType("text");
@@ -1046,6 +1052,9 @@ namespace GerbilManagerWebAPI.Migrations
                     b.Property<string>("PairingCode")
                         .HasColumnType("text");
 
+                    b.Property<string>("Provenance")
+                        .HasColumnType("text");
+
                     b.Property<int?>("TotalBorn")
                         .HasColumnType("integer");
 

GerbilManagerWebAPI/Models/Contact.cs

@@ -24,5 +24,11 @@ namespace GerbilManagerWebAPI.Models
         /// „von den Wüstenwinden“. Für Tiere fremder Züchter pflegbar.
         /// </summary>
         public string? NameSuffix { get; set; }
+
+        /// <summary>Data-provenance / traceability for the import: a JSON object describing
+        /// WHICH source information produced this contact (sourceFiles, mergedRecordCount,
+        /// notes). Written by the Python merge_and_resolve step and surfaced read-only
+        /// ("Datenherkunft"). Null = manually-added contact / no import data.</summary>
+        public string? Provenance { get; set; }
     }
 }

GerbilManagerWebAPI/Models/Feedback.cs

@@ -26,6 +26,9 @@ namespace GerbilManagerWebAPI.Models
         /// <summary>Loose reference (no FK) to the litter the report is about, if any.</summary>
         public Guid? LitterId { get; set; }
 
+        /// <summary>Loose reference (no FK) to the contact the report is about, if any.</summary>
+        public Guid? ContactId { get; set; }
+
         /// <summary>Captured name of the referenced animal/litter (survives an ingest wipe).</summary>
         public string? EntityName { get; set; }
 

GerbilManagerWebAPI/Models/Litter.cs

@@ -38,5 +38,12 @@ namespace GerbilManagerWebAPI.Models
         /// <summary>FEAT-NAMEGEN: Wurfbuchstabe (A, B, C … AA, AB …) — alle Welpen dieses
         /// Wurfs erhalten Namen mit diesem Anfangsbuchstaben (gängige Zuchtkonvention).</summary>
         public string? LitterLetter { get; set; }
+
+        /// <summary>Data-provenance / traceability for the import: a JSON object describing
+        /// WHICH source information produced this litter (sourceFiles, mergedRecordCount,
+        /// fromWurfchronik, notes — e.g. "aus Wurfchronik", "aus Stammbaum-Diagramm rekonstruiert").
+        /// Written by the Python merge_and_resolve step and surfaced read-only ("Datenherkunft").
+        /// Null = manually-added litter / no import data.</summary>
+        public string? Provenance { get; set; }
     }
 }

gerbil-manager-web/e2e/feedback.spec.ts

@@ -56,6 +56,24 @@ test('Wurf-Ansicht: "Fehler melden"-Button öffnet den Dialog und sendet mit Wur
   expect(reports[0]).toMatchObject({ context: 'litter-detail', litterId: 'w-kruemel' })
 })
 
+test('Kontakt-Detail: "Fehler melden"-Button sendet mit Kontakt-Kontext', async ({ page, mockDb }) => {
+  skipUnlessMock()
+  await page.goto('/kontakte/con-meier')
+
+  await page.getByRole('button', { name: f.button }).click()
+  const dialog = page.getByRole('dialog', { name: f.dialogTitle })
+  await expect(dialog).toBeVisible()
+  await expect(dialog).toContainText(f.contexts['contact-detail'])
+
+  await dialog.getByLabel(f.label).fill('Die Adresse stimmt nicht.')
+  await dialog.getByRole('button', { name: f.submit }).click()
+  await expect(page.getByText(f.success)).toBeVisible()
+
+  const reports = mockDb!.feedback
+  expect(reports.length).toBe(1)
+  expect(reports[0]).toMatchObject({ context: 'contact-detail', contactId: 'con-meier' })
+})
+
 test('Stammbaum: Rechtsklick auf eine Karte zeigt "ID kopieren" + "Fehler melden"', async ({ page, mockDb }) => {
   skipUnlessMock()
   await page.goto('/rennmaeuse/kruemel/stammbaum')

gerbil-manager-web/e2e/mock-data.ts

@@ -195,7 +195,16 @@ export function seedDb(): MockDb {
   const litters: Litter[] = [
     { id: 'w-zwillinge', name: 'Wurf Z', date: '2020-05-01', totalBorn: 4, expectedGoHomeDate: null, notes: null, fatherId: 'opa-w', motherId: 'oma-u' },
     { id: 'w-inzucht', name: 'Wurf I', date: '2021-06-01', totalBorn: 3, expectedGoHomeDate: null, notes: null, fatherId: 'zwilling-bock', motherId: 'zwilling-maus' },
-    { id: 'w-kruemel', name: 'Wurf K', date: '2025-03-12', totalBorn: 5, expectedGoHomeDate: '2025-04-16', notes: null, fatherId: 'fridolin', motherId: 'luna', deathsWithin8Weeks: 1 },
+    {
+      id: 'w-kruemel', name: 'Wurf K', date: '2025-03-12', totalBorn: 5, expectedGoHomeDate: '2025-04-16', notes: null, fatherId: 'fridolin', motherId: 'luna', deathsWithin8Weeks: 1,
+      // NACHVERFOLGUNG: Datenherkunft des Wurfs (vom Import erzeugter JSON-String).
+      provenance: JSON.stringify({
+        sourceFiles: ['Wurfchronik Teil 1_page_0009.md', 'Wurfchronik Teil 1_page_0028.md'],
+        mergedRecordCount: 2,
+        fromWurfchronik: true,
+        notes: ['aus Wurfchronik', 'aus 2 Datensätzen zusammengeführt', 'Geschwister-Würfe zusammengeführt'],
+      }),
+    },
     { id: 'w-fridolin', name: 'Wurf F', date: '2023-05-01', totalBorn: 4, expectedGoHomeDate: null, notes: null, fatherId: 'balu', motherId: 'maja' },
     { id: 'w-luna', name: 'Wurf L', date: '2023-08-15', totalBorn: 6, expectedGoHomeDate: null, notes: null, fatherId: 'karlsson', motherId: 'smilla' },
     { id: 'w-balu', name: 'Wurf B', date: '2021-04-20', totalBorn: 3, expectedGoHomeDate: null, notes: null, fatherId: 'anton', motherId: 'greta' },
@@ -212,7 +221,16 @@ export function seedDb(): MockDb {
 
   // FEAT-13: contactInfo (Freitext) wurde durch strukturierte Felder ersetzt.
   const contacts: Contact[] = [
-    { id: 'con-meier', name: 'Zoohandlung Meier', email: 'meier@example.de', phone: null, address: 'Hauptstraße 1, 12345 Musterstadt', notes: null, isBreeder: true, isReceiver: true },
+    {
+      id: 'con-meier', name: 'Zoohandlung Meier', email: 'meier@example.de', phone: null, address: 'Hauptstraße 1, 12345 Musterstadt', notes: null, isBreeder: true, isReceiver: true,
+      // NACHVERFOLGUNG: Datenherkunft des Kontakts (vom Import erzeugter JSON-String).
+      provenance: JSON.stringify({
+        sourceFiles: ['Wurfchronik Teil 1_page_0001.md', 'Stammbaum von Krümel.xlsx'],
+        mergedRecordCount: 2,
+        fromWurfchronik: true,
+        notes: ['aus 2 Datensätzen zusammengeführt', 'als Züchter erkannt', 'als Abnehmer erkannt'],
+      }),
+    },
     { id: 'con-huber', name: 'Familie Huber', email: null, phone: '0151 2345678', address: null, notes: null, isBreeder: false, isReceiver: true },
     { id: 'con-frei', name: 'Züchterin Frei', email: null, phone: null, address: null, notes: 'unverknüpft', isBreeder: true, isReceiver: false },
     { id: 'con-neither', name: 'Weder Noch', email: null, phone: null, address: null, notes: 'weder züchter noch abnehmer', isBreeder: false, isReceiver: false },

gerbil-manager-web/e2e/provenance.spec.ts

@@ -44,3 +44,42 @@ test('Tierakte: Tier ohne Importdaten zeigt "Keine Herkunftsdaten"', async ({ pa
   await expect(dialog).toBeVisible()
   await expect(dialog).toContainText(p.empty)
 })
+
+test('Kontakt: "Datenherkunft"-Button öffnet den Nachverfolgungs-Dialog', async ({ page }) => {
+  skipUnlessMock()
+  await page.goto('/kontakte/con-meier')
+
+  await page.getByRole('button', { name: p.button }).click()
+  const dialog = page.getByRole('dialog', { name: p.dialogTitle })
+  await expect(dialog).toBeVisible()
+
+  // Quelldateien + Zusammenführung + Kontakt-Rolle-Hinweise.
+  await expect(dialog).toContainText(p.sourceFilesTitle)
+  await expect(dialog).toContainText('Wurfchronik Teil 1_page_0001.md')
+  await expect(dialog).toContainText(p.mergedCount(2))
+  await expect(dialog).toContainText(p.fromWurfchronik)
+  await expect(dialog).toContainText('als Züchter erkannt')
+  await expect(dialog).toContainText('als Abnehmer erkannt')
+
+  await dialog.locator('.provenance__actions').getByRole('button', { name: p.close }).click()
+  await expect(dialog).not.toBeVisible()
+})
+
+test('Wurf: "Datenherkunft"-Button öffnet den Nachverfolgungs-Dialog', async ({ page }) => {
+  skipUnlessMock()
+  await page.goto('/wuerfe/w-kruemel')
+
+  await page.getByRole('button', { name: p.button }).click()
+  const dialog = page.getByRole('dialog', { name: p.dialogTitle })
+  await expect(dialog).toBeVisible()
+
+  await expect(dialog).toContainText(p.sourceFilesTitle)
+  await expect(dialog).toContainText('Wurfchronik Teil 1_page_0009.md')
+  await expect(dialog).toContainText(p.mergedCount(2))
+  await expect(dialog).toContainText(p.fromWurfchronik)
+  await expect(dialog).toContainText('aus Wurfchronik')
+  await expect(dialog).toContainText('Geschwister-Würfe zusammengeführt')
+
+  await dialog.locator('.provenance__actions').getByRole('button', { name: p.close }).click()
+  await expect(dialog).not.toBeVisible()
+})

gerbil-manager-web/src/api/feedback.ts

@@ -4,7 +4,7 @@ import { api } from './client'
 const RESOURCE = '/feedback'
 
 /** Which view a report was filed from (matches the backend Context contract). */
-export type FeedbackContext = 'stammbaum' | 'gerbil-detail' | 'litter-detail'
+export type FeedbackContext = 'stammbaum' | 'gerbil-detail' | 'litter-detail' | 'contact-detail'
 
 /** Payload for POST /feedback. Debug fields are captured automatically by the caller. */
 export interface FeedbackInput {
@@ -12,6 +12,7 @@ export interface FeedbackInput {
   context: FeedbackContext
   gerbilId?: string | null
   litterId?: string | null
+  contactId?: string | null
   entityName?: string | null
   url?: string | null
   clientTimestamp?: string | null
@@ -23,6 +24,7 @@ export interface Feedback {
   context: string
   gerbilId: string | null
   litterId: string | null
+  contactId: string | null
   entityName: string | null
   url: string | null
   clientTimestamp: string | null

gerbil-manager-web/src/api/types.ts

@@ -90,6 +90,13 @@ export interface GerbilProvenance {
   notes: string[]
 }
 
+/**
+ * NACHVERFOLGUNG: geparste Datenherkunft eines beliebigen importierten Eintrags
+ * (Tier, Kontakt oder Wurf). {@link GerbilProvenance} ist die Tier-Spezialisierung
+ * mit zusätzlichen Eltern-Feldern; Kontakte/Würfe nutzen dieselbe Grundform.
+ */
+export type EntityProvenance = GerbilProvenance
+
 /** Payload for POST /gerbils. */
 export interface CreateGerbil {
   name: string
@@ -142,6 +149,11 @@ export interface Contact {
   isReceiver: boolean
   /** Namens-Anhängsel dieser Zucht (für Tiere fremder Züchter). */
   nameSuffix: string | null
+  /**
+   * NACHVERFOLGUNG: Datenherkunft des Import-Eintrags als JSON-String (vom
+   * Python-Merge erzeugt; siehe {@link EntityProvenance}). null = manuell angelegt.
+   */
+  provenance?: string | null
 }
 
 export interface Litter {
@@ -162,6 +174,11 @@ export interface Litter {
   motherId: string | null
   /** LITTER-MORTALITY: pups that died within the first 8 weeks. */
   deathsWithin8Weeks?: number | null
+  /**
+   * NACHVERFOLGUNG: Datenherkunft des Import-Eintrags als JSON-String (vom
+   * Python-Merge erzeugt; siehe {@link EntityProvenance}). null = manuell angelegt.
+   */
+  provenance?: string | null
 }
 
 /** Payload for POST /litters. */

gerbil-manager-web/src/components/ProvenanceDialog.tsx

@@ -9,21 +9,23 @@
  */
 import { useEffect } from 'react'
 import { de } from '../strings/de'
-import type { GerbilProvenance } from '../api/types'
+import type { EntityProvenance } from '../api/types'
 import './provenanceDialog.css'
 
 interface ProvenanceDialogProps {
   open: boolean
   onClose: () => void
-  /** Raw provenance JSON string from Gerbil.provenance (null = no import data). */
+  /** Raw provenance JSON string from the entity (Gerbil/Contact/Litter; null = no import data). */
   provenance?: string | null
+  /** Optional entity label (e.g. "dieses Tiers", "dieses Kontakts") for the intro line. */
+  entityLabel?: string
 }
 
 /** Parse the JSON provenance string defensively; null on absence / parse error. */
-function parseProvenance(raw?: string | null): GerbilProvenance | null {
+function parseProvenance(raw?: string | null): EntityProvenance | null {
   if (!raw || !raw.trim()) return null
   try {
-    const p = JSON.parse(raw) as Partial<GerbilProvenance>
+    const p = JSON.parse(raw) as Partial<EntityProvenance>
     return {
       sourceFiles: Array.isArray(p.sourceFiles) ? p.sourceFiles : [],
       mergedRecordCount: typeof p.mergedRecordCount === 'number' ? p.mergedRecordCount : 0,
@@ -37,7 +39,7 @@ function parseProvenance(raw?: string | null): GerbilProvenance | null {
   }
 }
 
-export default function ProvenanceDialog({ open, onClose, provenance }: ProvenanceDialogProps) {
+export default function ProvenanceDialog({ open, onClose, provenance, entityLabel }: ProvenanceDialogProps) {
   // Close on Escape (only while mounted).
   useEffect(() => {
     if (!open) return
@@ -84,7 +86,7 @@ export default function ProvenanceDialog({ open, onClose, provenance }: Provenan
           <p className="provenance__empty">{t.empty}</p>
         ) : (
           <>
-            <p className="provenance__intro">{t.intro}</p>
+            <p className="provenance__intro">{entityLabel ? t.introFor(entityLabel) : t.intro}</p>
 
             <section className="provenance__section">
               <div className="provenance__section-title">

gerbil-manager-web/src/components/ReportErrorDialog.tsx

@@ -16,6 +16,7 @@ export interface ReportErrorContext {
   context: FeedbackContext
   gerbilId?: string | null
   litterId?: string | null
+  contactId?: string | null
   entityName?: string | null
 }
 
@@ -78,6 +79,7 @@ function ReportErrorDialogBody({
         context: context.context,
         gerbilId: context.gerbilId ?? null,
         litterId: context.litterId ?? null,
+        contactId: context.contactId ?? null,
         entityName: context.entityName ?? null,
         url: window.location.href,
         clientTimestamp: new Date().toISOString(),

gerbil-manager-web/src/pages/KontaktDetailPage.tsx

@@ -12,12 +12,16 @@ import { listGerbils } from '../api/gerbils'
 import { listColorVarieties } from '../api/lookups'
 import { condition } from '../api/gridify'
 import { useApi, useMutation } from '../hooks/useApi'
+import ProvenanceDialog from '../components/ProvenanceDialog'
+import ReportErrorDialog from '../components/ReportErrorDialog'
 
 export default function KontaktDetailPage() {
   const t = de.pages.kontakte
   const { id = '' } = useParams()
   const navigate = useNavigate()
   const [deleteError, setDeleteError] = useState<string | null>(null)
+  const [reportOpen, setReportOpen] = useState(false)
+  const [provenanceOpen, setProvenanceOpen] = useState(false)
 
   const contact = useApi(() => getContact(id), [id])
   // Verknüpfte Tiere: Kontakt ist Herkunft ODER Abnehmer (Gridify-OR via |).
@@ -79,6 +83,12 @@ export default function KontaktDetailPage() {
           <Link to={`/kontakte/${c.id}/bearbeiten`} className="btn btn--primary">
             {t.detail.edit}
           </Link>
+          <button type="button" className="btn" onClick={() => setProvenanceOpen(true)}>
+            {de.provenance.button}
+          </button>
+          <button type="button" className="btn" onClick={() => setReportOpen(true)}>
+            {de.feedback.button}
+          </button>
           <button
             type="button"
             className="btn btn--danger"
@@ -161,6 +171,19 @@ export default function KontaktDetailPage() {
           ))}
         </ul>
       )}
+
+      <ReportErrorDialog
+        open={reportOpen}
+        onClose={() => setReportOpen(false)}
+        context={{ context: 'contact-detail', contactId: c.id, entityName: c.name }}
+      />
+
+      <ProvenanceDialog
+        open={provenanceOpen}
+        onClose={() => setProvenanceOpen(false)}
+        provenance={c.provenance}
+        entityLabel={de.provenance.entityLabels.contact}
+      />
     </section>
   )
 }

gerbil-manager-web/src/pages/WurfDetailPage.tsx

@@ -13,6 +13,7 @@ import { isValidGenotype } from '../format/genotypeText'
 import { breed, fromDisplayString, genotypeToFarbschlag, UNKNOWN_FARBSCHLAG, type BreedingResult } from '../genetics'
 import BreedingResultView from '../components/BreedingResultView'
 import GerbilIcon from '../components/GerbilIcon'
+import ProvenanceDialog from '../components/ProvenanceDialog'
 import ReportErrorDialog from '../components/ReportErrorDialog'
 import { useGerbilName } from '../components/breederSuffix'
 import './wuerfe.css'
@@ -66,6 +67,7 @@ export default function WurfDetailPage() {
   const gerbilName = useGerbilName()
   const { id = '' } = useParams()
   const [reportOpen, setReportOpen] = useState(false)
+  const [provenanceOpen, setProvenanceOpen] = useState(false)
 
   const litter = useApi(() => getLitter(id), [id])
   const fatherId = litter.data?.fatherId ?? null
@@ -153,6 +155,9 @@ export default function WurfDetailPage() {
           <Link to={`/wuerfe/${l.id}/bearbeiten`} className="btn btn--primary">
             {t.detail.edit}
           </Link>
+          <button type="button" className="btn" onClick={() => setProvenanceOpen(true)}>
+            {de.provenance.button}
+          </button>
           <button type="button" className="btn" onClick={() => setReportOpen(true)}>
             {de.feedback.button}
           </button>
@@ -235,6 +240,13 @@ export default function WurfDetailPage() {
         onClose={() => setReportOpen(false)}
         context={{ context: 'litter-detail', litterId: l.id, entityName: l.name }}
       />
+
+      <ProvenanceDialog
+        open={provenanceOpen}
+        onClose={() => setProvenanceOpen(false)}
+        provenance={l.provenance}
+        entityLabel={de.provenance.entityLabels.litter}
+      />
     </section>
   )
 }

gerbil-manager-web/src/strings/de.ts

@@ -866,6 +866,7 @@ export const de = {
       stammbaum: 'Stammbaum',
       'gerbil-detail': 'Rennmausakte',
       'litter-detail': 'Wurf',
+      'contact-detail': 'Kontakt',
     },
     submit: 'Senden',
     submitting: 'Wird gesendet …',
@@ -884,6 +885,14 @@ export const de = {
     button: 'Datenherkunft',
     dialogTitle: 'Nachverfolgungsinformationen',
     intro: 'Woher stammen die Daten dieses Eintrags? Diese Angaben werden beim Import automatisch erfasst.',
+    /** Wie {@link intro}, aber mit Entitätsbezeichnung (z. B. „dieses Kontakts"). */
+    introFor: (label: string) =>
+      `Woher stammen die Daten ${label}? Diese Angaben werden beim Import automatisch erfasst.`,
+    /** Entitätsbezeichnungen für introFor (Genitiv). */
+    entityLabels: {
+      contact: 'dieses Kontakts',
+      litter: 'dieses Wurfs',
+    },
     /** Überschriften / Feldbeschriftungen. */
     sourceFilesTitle: 'Quelldateien',
     sourceFilesCount: (n: number) => (n === 1 ? 'aus 1 Quelle' : `aus ${n} Quellen`),

tools/import/merge_and_resolve.py

@@ -22,6 +22,30 @@ def generate_guid(key_str):
     """Generate a stable UUID string based on a key."""
     return str(uuid.uuid5(uuid.NAMESPACE_DNS, key_str))
 
+def build_entity_provenance(source_files, merged_record_count, notes=None,
+                            from_wurfchronik=None, extra=None):
+    """Generic data-provenance JSON builder shared by gerbils, contacts and
+    litters. Mirrors the GerbilProvenance frontend contract:
+      { sourceFiles, mergedRecordCount, fromWurfchronik, notes, ... }
+    `source_files` is any iterable of filenames; `from_wurfchronik` is auto-
+    derived from the filenames when left as None. `extra` may carry entity-
+    specific keys (e.g. parentMethod/parentConfidence for gerbils). Returns a
+    JSON string (stored on the nullable Provenance text column)."""
+    files = sorted({f for f in source_files if f})
+    if from_wurfchronik is None:
+        from_wurfchronik = any("wurfchronik" in f.lower() for f in files)
+    prov = {
+        "sourceFiles": files,
+        "mergedRecordCount": merged_record_count,
+        "fromWurfchronik": bool(from_wurfchronik),
+        "notes": list(notes or []),
+    }
+    if extra:
+        for k, v in extra.items():
+            if v is not None:
+                prov[k] = v
+    return json.dumps(prov, ensure_ascii=False)
+
 def to_valid_guid(val):
     if not val:
         return None
@@ -1101,6 +1125,7 @@ def main():
 
         norm_name = normalize_name(canon_name)
 
+        rc_file = rc.get("_filename")
         if norm_name not in contact_by_norm_name:
             global_guid = generate_guid(f"contact-{norm_name}")
             contact_by_norm_name[norm_name] = {
@@ -1109,7 +1134,10 @@ def main():
                 "Email": rc.get("Email") or rc.get("email"),
                 "Phone": rc.get("Phone") or rc.get("phone"),
                 "Address": rc.get("Address") or rc.get("address"),
-                "Notes": rc.get("Notes") or rc.get("notes") or rc.get("Note") or rc.get("note")
+                "Notes": rc.get("Notes") or rc.get("notes") or rc.get("Note") or rc.get("note"),
+                # Provenance accumulators (consumed below, stripped from helper keys).
+                "_source_files": set([rc_file]) if rc_file else set(),
+                "_merged_count": 1,
             }
         else:
             gc = contact_by_norm_name[norm_name]
@@ -1121,6 +1149,9 @@ def main():
                 gc["Address"] = rc.get("Address") or rc.get("address")
             if not gc["Notes"] and (rc.get("Notes") or rc.get("notes") or rc.get("Note") or rc.get("note")):
                 gc["Notes"] = rc.get("Notes") or rc.get("notes") or rc.get("Note") or rc.get("note")
+            if rc_file:
+                gc["_source_files"].add(rc_file)
+            gc["_merged_count"] += 1
 
         if scoped_id:
             contact_id_map[scoped_id] = contact_by_norm_name[norm_name]["Id"]
@@ -1189,7 +1220,13 @@ def main():
             "LitterLetter": rl.get("LitterLetter") or rl.get("litterLetter"),
             "_father_name": father_name,
             "_mother_name": mother_name,
-            "_filename": filename
+            "_filename": filename,
+            # Provenance accumulators (canonical absorbs these during dedup below).
+            "_source_files": set([filename]) if filename else set(),
+            "_merged_count": 1,
+            # Virtual litters are reconstructed from a Stammbaum chart, not the
+            # Wurfchronik — flagged on the raw record's _filename == "Stammbaum".
+            "_virtual": filename == "Stammbaum",
         }
         resolved_litters.append(l_record)
         litter_by_scoped_id[new_guid] = l_record
@@ -1236,6 +1273,10 @@ def main():
                 litter_dedup_canonical[l["Id"]] = canonical["Id"]
                 if l is not canonical:
                     litter_id_map[l["Id"]] = canonical["Id"]
+                    canonical["_source_files"] |= l.get("_source_files", set())
+                    canonical["_merged_count"] += l.get("_merged_count", 1)
+                    if not l.get("_virtual"):
+                        canonical["_virtual"] = False
 
             deduped_litters.append(canonical)
             if len(sub) > 1:
@@ -1742,17 +1783,13 @@ def main():
                 if n and n not in notes:
                     notes.append(n)
 
-        prov = {
-            "sourceFiles": sorted(source_files),
-            "mergedRecordCount": merged_count,
-            "fromWurfchronik": from_wurfchronik,
-            "notes": notes,
-        }
-        if parent_method:
-            prov["parentMethod"] = parent_method
-        if parent_confidence:
-            prov["parentConfidence"] = parent_confidence
-        return json.dumps(prov, ensure_ascii=False)
+        return build_entity_provenance(
+            source_files,
+            merged_count,
+            notes=notes,
+            from_wurfchronik=from_wurfchronik,
+            extra={"parentMethod": parent_method, "parentConfidence": parent_confidence},
+        )
 
     # Group gerbils by name to perform deduplication
     gerbil_groups = {}
@@ -2167,6 +2204,11 @@ def main():
             canonical = max(sub, key=lambda l: len(gerbil_by_litter.get(l["Id"], [])))
             for l in sub:
                 litter_remap2[l["Id"]] = canonical["Id"]
+                if l is not canonical:
+                    canonical["_source_files"] |= l.get("_source_files", set())
+                    canonical["_merged_count"] += l.get("_merged_count", 1)
+                    if not l.get("_virtual"):
+                        canonical["_virtual"] = False
             deduped2.append(canonical)
             if len(sub) > 1:
                 siblings = [g["Name"] for l in sub for g in gerbil_by_litter.get(l["Id"], []) if l is not canonical]
@@ -2186,6 +2228,29 @@ def main():
     resolved_litters = deduped2
     litter_by_scoped_id = {l["Id"]: l for l in resolved_litters}
 
+    # Datenherkunft for litters: which source files contributed, whether this is
+    # a Wurfchronik litter vs a Stammbaum-reconstructed ("virtual") litter, how
+    # many raw records merged into it, plus human-readable notes. Accumulators
+    # (_source_files/_merged_count/_virtual) were filled during the two dedup
+    # passes above; strip them after use.
+    for l in resolved_litters:
+        l_source_files = l.pop("_source_files", set())
+        l_merged_count = l.pop("_merged_count", 1)
+        is_virtual = l.pop("_virtual", False)
+        l_from_wurfchronik = any("wurfchronik" in str(f).lower() for f in l_source_files)
+        l_notes = []
+        if is_virtual and not l_from_wurfchronik:
+            l_notes.append("aus Stammbaum-Diagramm rekonstruiert")
+        elif l_from_wurfchronik:
+            l_notes.append("aus Wurfchronik")
+        if l_merged_count > 1:
+            l_notes.append(f"aus {l_merged_count} Datensätzen zusammengeführt")
+            l_notes.append("Geschwister-Würfe zusammengeführt")
+        l["Provenance"] = build_entity_provenance(
+            l_source_files, l_merged_count, notes=l_notes,
+            from_wurfchronik=l_from_wurfchronik,
+        )
+
     # Set IsBreeder and IsReceiver flags on contacts
     breeder_ids = {g["OriginContactId"] for g in resolved_gerbils if g.get("OriginContactId")}
     receiver_ids = {g["ReceiverContactId"] for g in resolved_gerbils if g.get("ReceiverContactId")}
@@ -2198,6 +2263,20 @@ def main():
         c["IsBreeder"] = is_breeder
         c["IsReceiver"] = is_receiver
 
+        # Datenherkunft: where this (deduplicated) contact came from, plus the
+        # role we inferred. Accumulator keys (_source_files/_merged_count) were
+        # filled during the contact dedup above; strip them after use.
+        c_source_files = c.pop("_source_files", set())
+        c_merged_count = c.pop("_merged_count", 1)
+        c_notes = []
+        if c_merged_count > 1:
+            c_notes.append(f"aus {c_merged_count} Datensätzen zusammengeführt")
+        if is_breeder:
+            c_notes.append("als Züchter erkannt")
+        if is_receiver:
+            c_notes.append("als Abnehmer erkannt")
+        c["Provenance"] = build_entity_provenance(c_source_files, c_merged_count, notes=c_notes)
+
     # Set and map gerbilPhotos
     resolved_photos = []
     for g in resolved_gerbils: