feat(relationship): date+precision edit UI, notes, and read-view display

Regenerate api.ts for the LocalDate+DatePrecision RelationshipDTO / RelationshipUpsertRequest and the new PUT, then migrate every caller: - RelationshipDateField (mirrors PersonLifeDateField: DAY/MONTH/YEAR, 44px targets, labelled, semantic dark-mode tokens, relation_* i18n keys). - AddRelationshipForm is now upsert-capable: an optional `relationship` prop pre-fills type, person, both dates+precision and notes; posts to ?/updateRelationship (else ?/addRelationship); the submit control disables and shows a progress spinner while a request is in flight (REQ-019); notes textarea (<=2000). - RelationshipChip gains an accessible Edit affordance (canWrite + onEdit); StammbaumCard wires it, formats the date range via formatRelationshipDateRange, and sorts by fromDate. PersonRelationshipsCard (read view) shows the date range and notes; no dates -> no date line. - persons/[id]/edit/+page.server.ts: updateRelationship action (PUT) + the addRelationship action reshaped to date+precision+notes (empty date omits precision for coherence). - Genealogy callers fixed for the dropped year fields: familyForest spouse-order and StammbaumConnectors ended-edge dashing now key off fromDate/toDate. - i18n relation_* form keys in de/en/es. REQ-004, REQ-014, REQ-015, REQ-016, REQ-019 Refs #837 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-14 19:24:24 +02:00
parent 4d9b165a2d
commit 491d1a015a
27 changed files with 960 additions and 353 deletions
--- a/frontend/messages/de.json
+++ b/frontend/messages/de.json
@@ -1221,6 +1221,16 @@
 	"relation_form_field_from_year": "Von Jahr",
 	"relation_form_field_to_year": "Bis Jahr",
 	"relation_form_year_placeholder": "z.B. 1920",
+	"relation_label_from_date": "Beginn (Datum)",
+	"relation_label_to_date": "Ende (Datum)",
+	"relation_label_date_precision": "Genauigkeit",
+	"relation_precision_day": "Genaues Datum (Tag)",
+	"relation_precision_month": "Monat bekannt",
+	"relation_precision_year": "Nur Jahreszahl",
+	"relation_label_notes": "Notizen",
+	"relation_notes_placeholder": "Optionaler Hinweis zu dieser Beziehung",
+	"relation_date_placeholder_hint": "Leer lassen, wenn unbekannt",
+	"relation_edit": "Beziehung bearbeiten",
 	"person_relationships_heading": "Beziehungen",
 	"person_relationships_empty": "Noch keine Beziehungen bekannt.",
 	"timeline_aria_label": "Zeitachse Dokumentdichte",
--- a/frontend/messages/en.json
+++ b/frontend/messages/en.json
@@ -1221,6 +1221,16 @@
 	"relation_form_field_from_year": "From year",
 	"relation_form_field_to_year": "To year",
 	"relation_form_year_placeholder": "e.g. 1920",
+	"relation_label_from_date": "Start date",
+	"relation_label_to_date": "End date",
+	"relation_label_date_precision": "Precision",
+	"relation_precision_day": "Exact date (day)",
+	"relation_precision_month": "Month known",
+	"relation_precision_year": "Year only",
+	"relation_label_notes": "Notes",
+	"relation_notes_placeholder": "Optional note about this relationship",
+	"relation_date_placeholder_hint": "Leave empty if unknown",
+	"relation_edit": "Edit relationship",
 	"person_relationships_heading": "Relationships",
 	"person_relationships_empty": "No relationships known yet.",
 	"timeline_aria_label": "Document density timeline",
--- a/frontend/messages/es.json
+++ b/frontend/messages/es.json
@@ -1221,6 +1221,16 @@
 	"relation_form_field_from_year": "Desde año",
 	"relation_form_field_to_year": "Hasta año",
 	"relation_form_year_placeholder": "ej. 1920",
+	"relation_label_from_date": "Fecha de inicio",
+	"relation_label_to_date": "Fecha de fin",
+	"relation_label_date_precision": "Precisión",
+	"relation_precision_day": "Fecha exacta (día)",
+	"relation_precision_month": "Mes conocido",
+	"relation_precision_year": "Solo año",
+	"relation_label_notes": "Notas",
+	"relation_notes_placeholder": "Nota opcional sobre esta relación",
+	"relation_date_placeholder_hint": "Dejar vacío si es desconocido",
+	"relation_edit": "Editar relación",
 	"person_relationships_heading": "Relaciones",
 	"person_relationships_empty": "Aún no se conocen relaciones.",
 	"timeline_aria_label": "Cronología de densidad de documentos",
--- a/frontend/src/lib/generated/api.ts
+++ b/frontend/src/lib/generated/api.ts
@@ -100,6 +100,22 @@ export interface paths {
        patch?: never;
        trace?: never;
    };
+    "/api/persons/{id}/relationships/{relId}": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get?: never;
+        put: operations["updateRelationship"];
+        post?: never;
+        delete: operations["deleteRelationship"];
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
    "/api/geschichten/{id}/items/reorder": {
        parameters: {
            query?: never;
@@ -1640,22 +1656,6 @@ export interface paths {
        patch?: never;
        trace?: never;
    };
-    "/api/persons/{id}/relationships/{relId}": {
-        parameters: {
-            query?: never;
-            header?: never;
-            path?: never;
-            cookie?: never;
-        };
-        get?: never;
-        put?: never;
-        post?: never;
-        delete: operations["deleteRelationship"];
-        options?: never;
-        head?: never;
-        patch?: never;
-        trace?: never;
-    };
    "/api/persons/{id}/aliases/{aliasId}": {
        parameters: {
            query?: never;
@@ -1853,6 +1853,50 @@ export interface components {
            provisional: boolean;
            readonly displayName: string;
        };
+        RelationshipUpsertRequest: {
+            /** Format: uuid */
+            relatedPersonId: string;
+            /** @enum {string} */
+            relationType: "PARENT_OF" | "SPOUSE_OF" | "SIBLING_OF" | "FRIEND" | "COLLEAGUE" | "EMPLOYER" | "DOCTOR" | "NEIGHBOR" | "OTHER";
+            /** Format: date */
+            fromDate?: string;
+            /** @enum {string} */
+            fromDatePrecision?: "DAY" | "MONTH" | "SEASON" | "YEAR" | "RANGE" | "APPROX" | "UNKNOWN";
+            /** Format: date */
+            toDate?: string;
+            /** @enum {string} */
+            toDatePrecision?: "DAY" | "MONTH" | "SEASON" | "YEAR" | "RANGE" | "APPROX" | "UNKNOWN";
+            notes?: string;
+        };
+        RelationshipDTO: {
+            /** Format: uuid */
+            id: string;
+            /** Format: uuid */
+            personId: string;
+            /** Format: uuid */
+            relatedPersonId: string;
+            personDisplayName: string;
+            /** Format: int32 */
+            personBirthYear?: number;
+            /** Format: int32 */
+            personDeathYear?: number;
+            relatedPersonDisplayName: string;
+            /** Format: int32 */
+            relatedPersonBirthYear?: number;
+            /** Format: int32 */
+            relatedPersonDeathYear?: number;
+            /** @enum {string} */
+            relationType: "PARENT_OF" | "SPOUSE_OF" | "SIBLING_OF" | "FRIEND" | "COLLEAGUE" | "EMPLOYER" | "DOCTOR" | "NEIGHBOR" | "OTHER";
+            /** Format: date */
+            fromDate?: string;
+            /** @enum {string} */
+            fromDatePrecision: "DAY" | "MONTH" | "SEASON" | "YEAR" | "RANGE" | "APPROX" | "UNKNOWN";
+            /** Format: date */
+            toDate?: string;
+            /** @enum {string} */
+            toDatePrecision: "DAY" | "MONTH" | "SEASON" | "YEAR" | "RANGE" | "APPROX" | "UNKNOWN";
+            notes?: string;
+        };
        JourneyReorderDTO: {
            itemIds?: string[];
        };
@@ -2008,42 +2052,6 @@ export interface components {
            /** Format: uuid */
            targetId: string;
        };
-        CreateRelationshipRequest: {
-            /** Format: uuid */
-            relatedPersonId: string;
-            /** @enum {string} */
-            relationType: "PARENT_OF" | "SPOUSE_OF" | "SIBLING_OF" | "FRIEND" | "COLLEAGUE" | "EMPLOYER" | "DOCTOR" | "NEIGHBOR" | "OTHER";
-            /** Format: int32 */
-            fromYear?: number;
-            /** Format: int32 */
-            toYear?: number;
-            notes?: string;
-        };
-        RelationshipDTO: {
-            /** Format: uuid */
-            id: string;
-            /** Format: uuid */
-            personId: string;
-            /** Format: uuid */
-            relatedPersonId: string;
-            personDisplayName: string;
-            /** Format: int32 */
-            personBirthYear?: number;
-            /** Format: int32 */
-            personDeathYear?: number;
-            relatedPersonDisplayName: string;
-            /** Format: int32 */
-            relatedPersonBirthYear?: number;
-            /** Format: int32 */
-            relatedPersonDeathYear?: number;
-            /** @enum {string} */
-            relationType: "PARENT_OF" | "SPOUSE_OF" | "SIBLING_OF" | "FRIEND" | "COLLEAGUE" | "EMPLOYER" | "DOCTOR" | "NEIGHBOR" | "OTHER";
-            /** Format: int32 */
-            fromYear?: number;
-            /** Format: int32 */
-            toYear?: number;
-            notes?: string;
-        };
        PersonNameAliasDTO: {
            lastName: string;
            firstName?: string;
@@ -3196,6 +3204,54 @@ export interface operations {
            };
        };
    };
+    updateRelationship: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                id: string;
+                relId: string;
+            };
+            cookie?: never;
+        };
+        requestBody: {
+            content: {
+                "application/json": components["schemas"]["RelationshipUpsertRequest"];
+            };
+        };
+        responses: {
+            /** @description OK */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "*/*": components["schemas"]["RelationshipDTO"];
+                };
+            };
+        };
+    };
+    deleteRelationship: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path: {
+                id: string;
+                relId: string;
+            };
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description No Content */
+            204: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content?: never;
+            };
+        };
+    };
    reorderItems: {
        parameters: {
            query?: never;
@@ -3659,7 +3715,7 @@ export interface operations {
        };
        requestBody: {
            content: {
-                "application/json": components["schemas"]["CreateRelationshipRequest"];
+                "application/json": components["schemas"]["RelationshipUpsertRequest"];
            };
        };
        responses: {
@@ -5905,27 +5961,6 @@ export interface operations {
            };
        };
    };
-    deleteRelationship: {
-        parameters: {
-            query?: never;
-            header?: never;
-            path: {
-                id: string;
-                relId: string;
-            };
-            cookie?: never;
-        };
-        requestBody?: never;
-        responses: {
-            /** @description No Content */
-            204: {
-                headers: {
-                    [name: string]: unknown;
-                };
-                content?: never;
-            };
-        };
-    };
    removeAlias: {
        parameters: {
            query?: never;
--- a/frontend/src/lib/person/PersonHoverCard.svelte.spec.ts
+++ b/frontend/src/lib/person/PersonHoverCard.svelte.spec.ts
@@ -193,7 +193,9 @@ describe('PersonHoverCard — loaded state', () => {
 				relatedPersonId: 'p-spouse',
 				personDisplayName: 'Auguste',
 				relatedPersonDisplayName: 'Otto Raddatz',
-				relationType: 'SPOUSE_OF'
+				relationType: 'SPOUSE_OF',
+				fromDatePrecision: 'UNKNOWN',
+				toDatePrecision: 'UNKNOWN'
 			},
 			{
 				id: 'r2',
@@ -201,7 +203,9 @@ describe('PersonHoverCard — loaded state', () => {
 				relatedPersonId: 'p-friend',
 				personDisplayName: 'Auguste',
 				relatedPersonDisplayName: 'Karl Friend',
-				relationType: 'FRIEND'
+				relationType: 'FRIEND',
+				fromDatePrecision: 'UNKNOWN',
+				toDatePrecision: 'UNKNOWN'
 			},
 			{
 				id: 'r3',
@@ -209,7 +213,9 @@ describe('PersonHoverCard — loaded state', () => {
 				relatedPersonId: 'p-sibling',
 				personDisplayName: 'Auguste',
 				relatedPersonDisplayName: 'Marie Sister',
-				relationType: 'SIBLING_OF'
+				relationType: 'SIBLING_OF',
+				fromDatePrecision: 'UNKNOWN',
+				toDatePrecision: 'UNKNOWN'
 			}
 		];
 		render(PersonHoverCard, {
@@ -235,7 +241,9 @@ describe('PersonHoverCard — loaded state', () => {
 				relatedPersonId: 'p-aug',
 				personDisplayName: 'Heinrich Raddatz',
 				relatedPersonDisplayName: 'Auguste Raddatz',
-				relationType: 'PARENT_OF'
+				relationType: 'PARENT_OF',
+				fromDatePrecision: 'UNKNOWN',
+				toDatePrecision: 'UNKNOWN'
 			}
 		];
 		render(PersonHoverCard, {
@@ -258,7 +266,9 @@ describe('PersonHoverCard — loaded state', () => {
 				relatedPersonId: 'p-friend',
 				personDisplayName: 'Auguste',
 				relatedPersonDisplayName: 'Karl Friend',
-				relationType: 'FRIEND'
+				relationType: 'FRIEND',
+				fromDatePrecision: 'UNKNOWN',
+				toDatePrecision: 'UNKNOWN'
 			}
 		];
 		render(PersonHoverCard, {
--- a/frontend/src/lib/person/genealogy/StammbaumCard.svelte
+++ b/frontend/src/lib/person/genealogy/StammbaumCard.svelte
@@ -4,6 +4,7 @@ import { m } from '$lib/paraglide/messages.js';
 import RelationshipChip from '$lib/person/relationship/RelationshipChip.svelte';
 import AddRelationshipForm from '$lib/person/relationship/AddRelationshipForm.svelte';
 import { chipLabel, otherName, inferredRelationshipLabel } from '$lib/person/relationshipLabels';
+import { formatRelationshipDateRange } from '$lib/person/relationshipDates';
 import type { components } from '$lib/generated/api';

 type RelationshipDTO = components['schemas']['RelationshipDTO'];
@@ -29,13 +30,15 @@ let {

 type RelationType = NonNullable<RelationshipDTO['relationType']>;

-const sortedDirect = $derived([...relationships].sort(byTypeThenYear));
+const sortedDirect = $derived([...relationships].sort(byTypeThenDate));
 const topDerived = $derived(inferredRelationships.slice(0, 5));
+let editingRelId = $state<string | null>(null);

-function byTypeThenYear(a: RelationshipDTO, b: RelationshipDTO): number {
+function byTypeThenDate(a: RelationshipDTO, b: RelationshipDTO): number {
 	const order = relationTypeOrder(a.relationType) - relationTypeOrder(b.relationType);
 	if (order !== 0) return order;
-	return (a.fromYear ?? 0) - (b.fromYear ?? 0);
+	// ISO dates sort lexicographically == chronologically; a missing date sorts first.
+	return (a.fromDate ?? '').localeCompare(b.fromDate ?? '');
 }

 function relationTypeOrder(t: RelationType | undefined): number {
@@ -53,13 +56,13 @@ function relationTypeOrder(t: RelationType | undefined): number {
 	return order[t ?? 'OTHER'] ?? 99;
 }

-function yearRange(rel: RelationshipDTO): string {
-	const from = rel.fromYear;
-	const to = rel.toYear;
-	if (from && to) return `${from}–${to}`;
-	if (from) return m.relation_year_from({ year: from });
-	if (to) return m.relation_year_to({ year: to });
-	return '';
+function dateRangeOf(rel: RelationshipDTO): string {
+	return formatRelationshipDateRange(
+		rel.fromDate,
+		rel.fromDatePrecision,
+		rel.toDate,
+		rel.toDatePrecision
+	);
 }
 </script>

@@ -132,10 +135,20 @@ function yearRange(rel: RelationshipDTO): string {
 				<RelationshipChip
 					chipLabel={chipLabel(rel, personId)}
 					otherName={otherName(rel, personId)}
-					yearRange={yearRange(rel)}
+					dateRange={dateRangeOf(rel)}
 					canWrite={canWrite}
 					relId={rel.id}
+					onEdit={canWrite ? () => (editingRelId = rel.id) : undefined}
 				/>
+				{#if editingRelId === rel.id}
+					<li>
+						<AddRelationshipForm
+							personId={personId}
+							relationship={rel}
+							onClose={() => (editingRelId = null)}
+						/>
+					</li>
+				{/if}
 			{/each}
 		</ul>
 	{/if}
--- a/frontend/src/lib/person/genealogy/StammbaumCard.svelte.test.ts
+++ b/frontend/src/lib/person/genealogy/StammbaumCard.svelte.test.ts
@@ -111,17 +111,21 @@ describe('StammbaumCard', () => {
 		expect(items.length).toBeGreaterThanOrEqual(2);
 	});

-	it('renders the year range "from–to" for a relationship with both years', async () => {
+	it('renders the date range "from – to" for a relationship with both dates', async () => {
 		render(StammbaumCard, {
 			props: baseProps({
 				relationships: [
 					{
 						id: 'r-1',
+						personId: 'p-1',
+						relatedPersonId: 'p-x',
+						personDisplayName: 'Anna',
+						relatedPersonDisplayName: 'Xavier',
 						relationType: 'COLLEAGUE',
-						fromYear: 1940,
-						toYear: 1945,
-						personA: { id: 'p-1', displayName: 'Anna' },
-						personB: { id: 'p-x', displayName: 'Xavier' }
+						fromDate: '1940-01-01',
+						fromDatePrecision: 'YEAR',
+						toDate: '1945-01-01',
+						toDatePrecision: 'YEAR'
 					}
 				]
 			})
@@ -131,23 +135,27 @@ describe('StammbaumCard', () => {
 		expect(document.body.textContent).toContain('1945');
 	});

-	it('renders only "fromYear" for a relationship with no end year', async () => {
+	it('renders only the start date for a relationship with no end date', async () => {
 		render(StammbaumCard, {
 			props: baseProps({
 				relationships: [
 					{
 						id: 'r-2',
+						personId: 'p-1',
+						relatedPersonId: 'p-y',
+						personDisplayName: 'Anna',
+						relatedPersonDisplayName: 'Yvonne',
 						relationType: 'NEIGHBOR',
-						fromYear: 1935,
-						personA: { id: 'p-1', displayName: 'Anna' },
-						personB: { id: 'p-y', displayName: 'Yvonne' }
+						fromDate: '1935-01-01',
+						fromDatePrecision: 'YEAR',
+						toDatePrecision: 'UNKNOWN'
 					}
 				]
 			})
 		});

 		expect(document.body.textContent).toContain('1935');
-		expect(document.body.textContent).not.toContain('1935–');
+		expect(document.body.textContent).not.toContain('1935 –');
 	});

 	it('renders the inferred-relationships disclosure when topDerived has items', async () => {
--- a/frontend/src/lib/person/genealogy/StammbaumConnectors.svelte
+++ b/frontend/src/lib/person/genealogy/StammbaumConnectors.svelte
@@ -250,7 +250,7 @@ const parentLinks = $derived.by<ParentLinks>(() => {
 				y2={bCenter.y}
 				stroke="var(--c-primary)"
 				stroke-width="1.5"
-				stroke-dasharray={e.toYear ? '4 4' : undefined}
+				stroke-dasharray={e.toDate ? '4 4' : undefined}
 			/>
 			<circle
 				cx={(aCenter.x + bCenter.x) / 2}
--- a/frontend/src/lib/person/genealogy/StammbaumConnectors.svelte.test.ts
+++ b/frontend/src/lib/person/genealogy/StammbaumConnectors.svelte.test.ts
@@ -18,7 +18,9 @@ function parentEdge(parentId: string, childId: string): RelationshipDTO {
 		relatedPersonId: childId,
 		personDisplayName: '',
 		relatedPersonDisplayName: '',
-		relationType: 'PARENT_OF'
+		relationType: 'PARENT_OF',
+		fromDatePrecision: 'UNKNOWN',
+		toDatePrecision: 'UNKNOWN'
 	};
 }

@@ -30,7 +32,9 @@ function endedSpouseEdge(a: string, b: string): RelationshipDTO {
 		personDisplayName: '',
 		relatedPersonDisplayName: '',
 		relationType: 'SPOUSE_OF',
-		toYear: 1950
+		fromDatePrecision: 'UNKNOWN',
+		toDate: '1950-01-01',
+		toDatePrecision: 'YEAR'
 	};
 }

--- a/frontend/src/lib/person/genealogy/StammbaumSidePanel.svelte
+++ b/frontend/src/lib/person/genealogy/StammbaumSidePanel.svelte
@@ -54,12 +54,19 @@ async function loadFor(id: string) {
 }

 async function handleAddRelationship(data: RelFormData) {
-	const body: Record<string, string | number> = {
+	const body: Record<string, string> = {
 		relatedPersonId: data.relatedPersonId,
 		relationType: data.relationType
 	};
-	if (data.fromYear !== undefined) body.fromYear = data.fromYear;
-	if (data.toYear !== undefined) body.toYear = data.toYear;
+	if (data.fromDate) {
+		body.fromDate = data.fromDate;
+		if (data.fromDatePrecision) body.fromDatePrecision = data.fromDatePrecision;
+	}
+	if (data.toDate) {
+		body.toDate = data.toDate;
+		if (data.toDatePrecision) body.toDatePrecision = data.toDatePrecision;
+	}
+	if (data.notes) body.notes = data.notes;
 	const res = await csrfFetch(`/api/persons/${node.id}/relationships`, {
 		method: 'POST',
 		headers: { 'Content-Type': 'application/json' },
--- a/frontend/src/lib/person/genealogy/StammbaumSidePanel.svelte.spec.ts
+++ b/frontend/src/lib/person/genealogy/StammbaumSidePanel.svelte.spec.ts
@@ -72,20 +72,20 @@ describe('StammbaumSidePanel', () => {
 		await expect.element(page.getByText('Noch keine Beziehungen bekannt.')).toBeInTheDocument();
 	});

-	it('year inputs inside the add form have label elements (canWrite=true)', async () => {
+	it('date inputs inside the add form have accessible labels (canWrite=true)', async () => {
 		render(StammbaumSidePanel, { node: makeNode(), onClose: vi.fn(), canWrite: true });
 		await expect.element(page.getByText('Noch keine Beziehungen bekannt.')).toBeInTheDocument();
 		const addBtn = [...document.querySelectorAll<HTMLButtonElement>('button')].find((b) =>
 			/Beziehung hinzufügen/i.test(b.textContent ?? '')
 		);
 		addBtn!.click();
-		await expect.element(page.getByRole('combobox')).toBeInTheDocument();
-		const yearInputs = [...document.querySelectorAll('input')].filter(
+		await expect.element(page.getByRole('combobox', { name: 'Typ' })).toBeInTheDocument();
+		const dateInputs = [...document.querySelectorAll('input')].filter(
 			(i) => i.inputMode === 'numeric'
 		);
-		expect(yearInputs.length).toBeGreaterThan(0);
-		for (const input of yearInputs) {
-			expect(input.closest('label')).not.toBeNull();
+		expect(dateInputs.length).toBeGreaterThan(0);
+		for (const input of dateInputs) {
+			expect(input.getAttribute('aria-label')).toBeTruthy();
 		}
 	});

--- a/frontend/src/lib/person/genealogy/StammbaumTree.svelte.test.ts
+++ b/frontend/src/lib/person/genealogy/StammbaumTree.svelte.test.ts
@@ -3,6 +3,9 @@ import { render } from 'vitest-browser-svelte';
 import StammbaumTree from './StammbaumTree.svelte';
 import type { PanZoomState } from './panZoom';
 import { DIMMED_OPACITY } from './layout/highlightLineage';
+import type { components } from '$lib/generated/api';
+
+type RelationshipDTO = components['schemas']['RelationshipDTO'];

 const ID_A = '00000000-0000-0000-0000-000000000001';
 const ID_B = '00000000-0000-0000-0000-000000000002';
@@ -105,7 +108,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: PARENT_B,
 					personDisplayName: 'Walter',
 					relatedPersonDisplayName: 'Eugenie',
-					relationType: 'SPOUSE_OF'
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p1a',
@@ -113,7 +118,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: CHILD_1,
 					personDisplayName: 'Walter',
 					relatedPersonDisplayName: 'Clara',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p1b',
@@ -121,7 +128,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: CHILD_1,
 					personDisplayName: 'Eugenie',
 					relatedPersonDisplayName: 'Clara',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p2a',
@@ -129,7 +138,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: CHILD_2,
 					personDisplayName: 'Walter',
 					relatedPersonDisplayName: 'Hans',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p2b',
@@ -137,7 +148,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: CHILD_2,
 					personDisplayName: 'Eugenie',
 					relatedPersonDisplayName: 'Hans',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			selectedId: null,
@@ -181,7 +194,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: PARENT_B,
 					personDisplayName: 'Walter',
 					relatedPersonDisplayName: 'Eugenie',
-					relationType: 'SPOUSE_OF'
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p1',
@@ -189,7 +204,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: CHILD,
 					personDisplayName: 'Walter',
 					relatedPersonDisplayName: 'Hans',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p2',
@@ -197,7 +214,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: CHILD,
 					personDisplayName: 'Eugenie',
 					relatedPersonDisplayName: 'Hans',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			selectedId: null,
@@ -244,7 +263,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: EUGENIE,
 					personDisplayName: 'Walter',
 					relatedPersonDisplayName: 'Eugenie',
-					relationType: 'SPOUSE_OF'
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p1',
@@ -252,7 +273,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: HANS,
 					personDisplayName: 'Walter',
 					relatedPersonDisplayName: 'Hans',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p2',
@@ -260,7 +283,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: HANS,
 					personDisplayName: 'Eugenie',
 					relatedPersonDisplayName: 'Hans',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p3',
@@ -268,7 +293,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: CLARA,
 					personDisplayName: 'Walter',
 					relatedPersonDisplayName: 'Clara',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p4',
@@ -276,7 +303,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: CLARA,
 					personDisplayName: 'Eugenie',
 					relatedPersonDisplayName: 'Clara',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 's2',
@@ -284,7 +313,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: HILDE,
 					personDisplayName: 'Hans',
 					relatedPersonDisplayName: 'Hilde',
-					relationType: 'SPOUSE_OF'
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p5',
@@ -292,7 +323,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: LILI,
 					personDisplayName: 'Hans',
 					relatedPersonDisplayName: 'Lili',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				},
 				{
 					id: 'p6',
@@ -300,7 +333,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: LILI,
 					personDisplayName: 'Hilde',
 					relatedPersonDisplayName: 'Lili',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			selectedId: null,
@@ -358,7 +393,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: ID_B,
 					personDisplayName: 'Anna',
 					relatedPersonDisplayName: 'Bertha',
-					relationType: 'SPOUSE_OF'
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			selectedId: null,
@@ -391,7 +428,9 @@ describe('StammbaumTree viewBox', () => {
 					relatedPersonId: ID_B,
 					personDisplayName: 'Anna',
 					relatedPersonDisplayName: 'Bertha',
-					relationType: 'SPOUSE_OF'
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			selectedId: null,
@@ -599,7 +638,9 @@ describe('StammbaumTree keyboard pan/zoom (#692)', () => {
 					relatedPersonId: ID_B,
 					personDisplayName: 'Anna',
 					relatedPersonDisplayName: 'Bertha',
-					relationType: 'SPOUSE_OF'
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			selectedId: null,
@@ -668,7 +709,9 @@ describe('StammbaumTree keyboard pan/zoom (#692)', () => {
 					personDisplayName: 'Anna',
 					relatedPersonDisplayName: 'Bertha',
 					relationType: 'SPOUSE_OF',
-					toYear: 1925
+					fromDatePrecision: 'UNKNOWN',
+					toDate: '1925-01-01',
+					toDatePrecision: 'YEAR'
 				}
 			],
 			selectedId: null,
@@ -695,7 +738,9 @@ describe('StammbaumTree keyboard pan/zoom (#692)', () => {
 					relatedPersonId: ID_B,
 					personDisplayName: 'Anna',
 					relatedPersonDisplayName: 'Bertha',
-					relationType: 'SPOUSE_OF'
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			selectedId: null,
@@ -723,7 +768,9 @@ describe('StammbaumTree keyboard pan/zoom (#692)', () => {
 					relatedPersonId: CHILD,
 					personDisplayName: 'Parent',
 					relatedPersonDisplayName: 'Child',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			selectedId: null,
@@ -908,6 +955,8 @@ describe('StammbaumTree lineage highlight (#703)', () => {
 		personDisplayName: string;
 		relatedPersonDisplayName: string;
 		relationType: 'PARENT_OF' | 'SPOUSE_OF';
+		fromDatePrecision: 'UNKNOWN';
+		toDatePrecision: 'UNKNOWN';
 	};
 	const edge = (
 		personId: string,
@@ -919,7 +968,9 @@ describe('StammbaumTree lineage highlight (#703)', () => {
 		relatedPersonId,
 		personDisplayName: '',
 		relatedPersonDisplayName: '',
-		relationType
+		relationType,
+		fromDatePrecision: 'UNKNOWN',
+		toDatePrecision: 'UNKNOWN'
 	});

 	const NODES = [
@@ -1104,14 +1155,16 @@ describe('StammbaumTree keyboard tab order (#718)', () => {
 	// year, then a deterministic id tie-break), not alphabetically — with no birth
 	// years here Walter (id …a1) owns the run and Eugenie sits to his right. So the
 	// deterministic visual order is Walter, Eugenie (top row) then Clara, Hans.
-	const FAMILY_EDGES = [
+	const FAMILY_EDGES: RelationshipDTO[] = [
 		{
 			id: 'sp',
 			personId: WALTER,
 			relatedPersonId: EUGENIE,
 			personDisplayName: 'Walter',
 			relatedPersonDisplayName: 'Eugenie',
-			relationType: 'SPOUSE_OF'
+			relationType: 'SPOUSE_OF',
+			fromDatePrecision: 'UNKNOWN',
+			toDatePrecision: 'UNKNOWN'
 		},
 		{
 			id: 'p1',
@@ -1119,7 +1172,9 @@ describe('StammbaumTree keyboard tab order (#718)', () => {
 			relatedPersonId: CLARA,
 			personDisplayName: 'Walter',
 			relatedPersonDisplayName: 'Clara',
-			relationType: 'PARENT_OF'
+			relationType: 'PARENT_OF',
+			fromDatePrecision: 'UNKNOWN',
+			toDatePrecision: 'UNKNOWN'
 		},
 		{
 			id: 'p2',
@@ -1127,7 +1182,9 @@ describe('StammbaumTree keyboard tab order (#718)', () => {
 			relatedPersonId: CLARA,
 			personDisplayName: 'Eugenie',
 			relatedPersonDisplayName: 'Clara',
-			relationType: 'PARENT_OF'
+			relationType: 'PARENT_OF',
+			fromDatePrecision: 'UNKNOWN',
+			toDatePrecision: 'UNKNOWN'
 		},
 		{
 			id: 'p3',
@@ -1135,7 +1192,9 @@ describe('StammbaumTree keyboard tab order (#718)', () => {
 			relatedPersonId: HANS,
 			personDisplayName: 'Walter',
 			relatedPersonDisplayName: 'Hans',
-			relationType: 'PARENT_OF'
+			relationType: 'PARENT_OF',
+			fromDatePrecision: 'UNKNOWN',
+			toDatePrecision: 'UNKNOWN'
 		},
 		{
 			id: 'p4',
@@ -1143,7 +1202,9 @@ describe('StammbaumTree keyboard tab order (#718)', () => {
 			relatedPersonId: HANS,
 			personDisplayName: 'Eugenie',
 			relatedPersonDisplayName: 'Hans',
-			relationType: 'PARENT_OF'
+			relationType: 'PARENT_OF',
+			fromDatePrecision: 'UNKNOWN',
+			toDatePrecision: 'UNKNOWN'
 		}
 	];

--- a/frontend/src/lib/person/genealogy/layout/buildLayout.test.ts
+++ b/frontend/src/lib/person/genealogy/layout/buildLayout.test.ts
@@ -42,7 +42,9 @@ function parentEdge(parentId: string, childId: string, id = parentId + childId):
 		relatedPersonId: childId,
 		personDisplayName: '',
 		relatedPersonDisplayName: '',
-		relationType: 'PARENT_OF'
+		relationType: 'PARENT_OF',
+		fromDatePrecision: 'UNKNOWN',
+		toDatePrecision: 'UNKNOWN'
 	};
 }

@@ -53,7 +55,9 @@ function spouseEdge(a: string, b: string, id = a + b): RelationshipDTO {
 		relatedPersonId: b,
 		personDisplayName: '',
 		relatedPersonDisplayName: '',
-		relationType: 'SPOUSE_OF'
+		relationType: 'SPOUSE_OF',
+		fromDatePrecision: 'UNKNOWN',
+		toDatePrecision: 'UNKNOWN'
 	};
 }

@@ -220,7 +224,10 @@ describe('buildLayout — multi-spouse ordering (#361)', () => {
 		fromYear: number | undefined,
 		id = a + b
 	): RelationshipDTO {
-		return { ...spouseEdge(a, b, id), fromYear };
+		return {
+			...spouseEdge(a, b, id),
+			...(fromYear != null ? { fromDate: `${fromYear}-01-01`, fromDatePrecision: 'YEAR' } : {})
+		};
 	}

 	it('multi_spouses_ordered_by_fromYear_then_displayName', () => {
@@ -329,7 +336,7 @@ describe('buildLayout — multi-spouse ordering (#361)', () => {
 		// fail fast instead so the maintainer either updates the test or
 		// splits into a year-branch / name-branch pair.
 		const spouseEdgesWithYear = fixtureEdges.filter(
-			(e) => e.relationType === 'SPOUSE_OF' && e.fromYear != null
+			(e) => e.relationType === 'SPOUSE_OF' && e.fromDate != null
 		);
 		expect(
 			spouseEdgesWithYear,
--- a/frontend/src/lib/person/genealogy/layout/familyForest.test.ts
+++ b/frontend/src/lib/person/genealogy/layout/familyForest.test.ts
@@ -21,7 +21,9 @@ function parent(p: string, c: string): RelationshipDTO {
 		relatedPersonId: c,
 		personDisplayName: '',
 		relatedPersonDisplayName: '',
-		relationType: 'PARENT_OF'
+		relationType: 'PARENT_OF',
+		fromDatePrecision: 'UNKNOWN',
+		toDatePrecision: 'UNKNOWN'
 	};
 }

@@ -33,7 +35,9 @@ function spouse(a: string, b: string, fromYear?: number): RelationshipDTO {
 		personDisplayName: '',
 		relatedPersonDisplayName: '',
 		relationType: 'SPOUSE_OF',
-		...(fromYear != null ? { fromYear } : {})
+		fromDatePrecision: 'UNKNOWN',
+		toDatePrecision: 'UNKNOWN',
+		...(fromYear != null ? { fromDate: `${fromYear}-01-01`, fromDatePrecision: 'YEAR' } : {})
 	};
 }

--- a/frontend/src/lib/person/genealogy/layout/familyForest.ts
+++ b/frontend/src/lib/person/genealogy/layout/familyForest.ts
@@ -82,7 +82,10 @@ export function buildFamilyForest(nodes: PersonNodeDTO[], edges: RelationshipDTO
 		} else if (e.relationType === 'SPOUSE_OF') {
 			addToSet(spouses, e.personId, e.relatedPersonId);
 			addToSet(spouses, e.relatedPersonId, e.personId);
-			spouseYear.set(pairKey(e.personId, e.relatedPersonId), e.fromYear ?? undefined);
+			spouseYear.set(
+				pairKey(e.personId, e.relatedPersonId),
+				e.fromDate ? Number(e.fromDate.slice(0, 4)) : undefined
+			);
 		}
 	}

--- a/frontend/src/lib/person/genealogy/layout/highlightLineage.test.ts
+++ b/frontend/src/lib/person/genealogy/layout/highlightLineage.test.ts
@@ -13,7 +13,9 @@ function parentEdge(parentId: string, childId: string, id = parentId + childId):
 		relatedPersonId: childId,
 		personDisplayName: '',
 		relatedPersonDisplayName: '',
-		relationType: 'PARENT_OF'
+		relationType: 'PARENT_OF',
+		fromDatePrecision: 'UNKNOWN',
+		toDatePrecision: 'UNKNOWN'
 	};
 }

@@ -24,7 +26,9 @@ function spouseEdge(a: string, b: string, id = a + b): RelationshipDTO {
 		relatedPersonId: b,
 		personDisplayName: '',
 		relatedPersonDisplayName: '',
-		relationType: 'SPOUSE_OF'
+		relationType: 'SPOUSE_OF',
+		fromDatePrecision: 'UNKNOWN',
+		toDatePrecision: 'UNKNOWN'
 	};
 }

@@ -35,7 +39,9 @@ function siblingEdge(a: string, b: string, id = a + b): RelationshipDTO {
 		relatedPersonId: b,
 		personDisplayName: '',
 		relatedPersonDisplayName: '',
-		relationType: 'SIBLING_OF'
+		relationType: 'SIBLING_OF',
+		fromDatePrecision: 'UNKNOWN',
+		toDatePrecision: 'UNKNOWN'
 	};
 }

--- a/frontend/src/lib/person/relationship/AddRelationshipForm.svelte
+++ b/frontend/src/lib/person/relationship/AddRelationshipForm.svelte
@@ -1,8 +1,11 @@
 <script lang="ts">
+import { onMount } from 'svelte';
 import { enhance } from '$app/forms';
 import { m } from '$lib/paraglide/messages.js';
 import PersonTypeahead from '$lib/person/PersonTypeahead.svelte';
+import RelationshipDateField from '$lib/person/relationship/RelationshipDateField.svelte';
 import type { components } from '$lib/generated/api';
+import type { DatePrecision } from '$lib/shared/utils/documentDate';

 type RelationshipDTO = components['schemas']['RelationshipDTO'];
 type RelationType = NonNullable<RelationshipDTO['relationType']>;
@@ -10,71 +13,96 @@ type RelationType = NonNullable<RelationshipDTO['relationType']>;
 export type RelFormData = {
 	relatedPersonId: string;
 	relationType: RelationType;
-	fromYear?: number;
-	toYear?: number;
+	fromDate?: string;
+	fromDatePrecision?: DatePrecision;
+	toDate?: string;
+	toDatePrecision?: DatePrecision;
+	notes?: string;
 };

 interface Props {
 	personId: string;
+	// When present the form is an EDIT: pre-filled and posting to ?/updateRelationship.
+	relationship?: RelationshipDTO;
 	onSubmit?: (data: RelFormData) => Promise<void>;
+	onClose?: () => void;
 }

-let { personId, onSubmit }: Props = $props();
+let { personId, relationship, onSubmit, onClose }: Props = $props();
+
+const isEdit = $derived(relationship != null);

 let open = $state(false);
 let addType = $state<RelationType>('PARENT_OF');
 let addRelatedPersonId = $state('');
 let addRelatedPersonName = $state('');
-let addFromYear = $state('');
-let addToYear = $state('');
+let notes = $state('');
 let callbackError = $state<string | null>(null);
+let submitting = $state(false);

-const yearError = $derived.by(() => {
-	const from = addFromYear.trim();
-	const to = addToYear.trim();
-	if (!from || !to) return null;
-	const fromInt = parseInt(from, 10);
-	const toInt = parseInt(to, 10);
-	if (Number.isNaN(fromInt) || Number.isNaN(toInt)) return null;
-	return toInt < fromInt ? m.relation_year_error_bis_before_von() : null;
+// Seed once at mount (reading props in a closure avoids state_referenced_locally).
+// The parent re-creates this form per edited row, so the relationship never
+// changes under a live instance.
+onMount(() => {
+	if (!relationship) return;
+	open = true;
+	addType = relationship.relationType ?? 'PARENT_OF';
+	const viewpointIsSubject = relationship.personId === personId;
+	addRelatedPersonId =
+		(viewpointIsSubject ? relationship.relatedPersonId : relationship.personId) ?? '';
+	addRelatedPersonName =
+		(viewpointIsSubject ? relationship.relatedPersonDisplayName : relationship.personDisplayName) ??
+		'';
+	notes = relationship.notes ?? '';
 });

 const selfError = $derived(
 	addRelatedPersonId !== '' && addRelatedPersonId === personId ? m.relation_error_self() : null
 );

-const submitDisabled = $derived(
-	yearError !== null || selfError !== null || addRelatedPersonId === ''
-);
+const submitDisabled = $derived(selfError !== null || addRelatedPersonId === '');

 function reset() {
 	addType = 'PARENT_OF';
 	addRelatedPersonId = '';
 	addRelatedPersonName = '';
-	addFromYear = '';
-	addToYear = '';
+	notes = '';
 	callbackError = null;
 }

 function cancel() {
+	if (isEdit) {
+		onClose?.();
+		return;
+	}
 	open = false;
 	reset();
 }

-async function handleCallbackSubmit(event: Event) {
+async function handleCallbackSubmit(event: SubmitEvent) {
 	event.preventDefault();
 	if (submitDisabled || !onSubmit) return;
-	const data: RelFormData = { relatedPersonId: addRelatedPersonId, relationType: addType };
-	const from = parseInt(addFromYear.trim(), 10);
-	if (!Number.isNaN(from)) data.fromYear = from;
-	const to = parseInt(addToYear.trim(), 10);
-	if (!Number.isNaN(to)) data.toYear = to;
+	const fd = new FormData(event.currentTarget as HTMLFormElement);
+	const fromDate = (fd.get('fromDate') as string) || undefined;
+	const toDate = (fd.get('toDate') as string) || undefined;
+	const data: RelFormData = {
+		relatedPersonId: addRelatedPersonId,
+		relationType: addType,
+		fromDate,
+		fromDatePrecision: fromDate ? (fd.get('fromDatePrecision') as DatePrecision) : undefined,
+		toDate,
+		toDatePrecision: toDate ? (fd.get('toDatePrecision') as DatePrecision) : undefined,
+		notes: (fd.get('notes') as string)?.trim() || undefined
+	};
+	submitting = true;
 	try {
 		await onSubmit(data);
 		open = false;
 		reset();
 	} catch {
 		callbackError = m.error_internal_error();
+	} finally {
+		submitting = false;
 	}
 }
 </script>
@@ -113,39 +141,32 @@ async function handleCallbackSubmit(event: Event) {
 				compact
 			/>
 		</div>
-		<label class="block">
-			<span class="font-sans text-xs font-medium text-ink-2"
-				>{m.relation_form_field_from_year()}</span
-			>
-			<input
-				type="text"
-				name="fromYear"
-				inputmode="numeric"
-				pattern="[0-9]*"
-				bind:value={addFromYear}
-				placeholder={m.relation_form_year_placeholder()}
-				class="mt-1 block w-full rounded-sm border border-line bg-surface px-2 py-1.5 text-sm text-ink focus:border-primary focus:outline-none"
-			/>
-		</label>
-		<label class="block">
-			<span class="font-sans text-xs font-medium text-ink-2">{m.relation_form_field_to_year()}</span
-			>
-			<input
-				type="text"
-				name="toYear"
-				inputmode="numeric"
-				pattern="[0-9]*"
-				bind:value={addToYear}
-				aria-describedby={yearError ? 'add-rel-year-error' : undefined}
-				class="mt-1 block w-full rounded-sm border border-line bg-surface px-2 py-1.5 text-sm text-ink focus:border-primary focus:outline-none"
-			/>
-			{#if yearError}
-				<p id="add-rel-year-error" class="mt-1 text-xs text-red-700" role="alert">
-					{yearError}
-				</p>
-			{/if}
-		</label>
 	</div>
+	<div class="mt-3 grid gap-3 md:grid-cols-2">
+		<RelationshipDateField
+			name="fromDate"
+			legend={m.relation_label_from_date()}
+			initialIso={relationship?.fromDate ?? ''}
+			initialPrecision={relationship?.fromDatePrecision ?? null}
+		/>
+		<RelationshipDateField
+			name="toDate"
+			legend={m.relation_label_to_date()}
+			initialIso={relationship?.toDate ?? ''}
+			initialPrecision={relationship?.toDatePrecision ?? null}
+		/>
+	</div>
+	<label class="mt-3 block">
+		<span class="font-sans text-xs font-medium text-ink-2">{m.relation_label_notes()}</span>
+		<textarea
+			name="notes"
+			maxlength="2000"
+			rows="2"
+			bind:value={notes}
+			placeholder={m.relation_notes_placeholder()}
+			class="mt-1 block w-full rounded-sm border border-line bg-surface px-2 py-1.5 font-serif text-sm text-ink-3 focus:border-primary focus:outline-none"
+		></textarea>
+	</label>
 	{#if selfError}
 		<p class="mt-2 text-xs text-red-700" role="alert">{selfError}</p>
 	{/if}
@@ -162,10 +183,18 @@ async function handleCallbackSubmit(event: Event) {
 		</button>
 		<button
 			type="submit"
-			disabled={submitDisabled}
-			class="rounded-sm bg-primary px-3 py-1.5 font-sans text-xs font-medium text-primary-fg transition hover:bg-primary/80 disabled:opacity-40"
+			disabled={submitDisabled || submitting}
+			aria-busy={submitting}
+			class="inline-flex items-center gap-1.5 rounded-sm bg-primary px-3 py-1.5 font-sans text-xs font-medium text-primary-fg transition hover:bg-primary/80 disabled:opacity-40"
 		>
-			{m.relation_btn_add()}
+			{#if submitting}
+				<span
+					class="h-3 w-3 animate-spin rounded-full border-2 border-primary-fg/40 border-t-primary-fg"
+					data-testid="submit-spinner"
+					aria-hidden="true"
+				></span>
+			{/if}
+			{isEdit ? m.relation_btn_save() : m.relation_btn_add()}
 		</button>
 	</div>
 {/snippet}
@@ -185,18 +214,27 @@ async function handleCallbackSubmit(event: Event) {
 {:else}
 	<form
 		method="POST"
-		action="?/addRelationship"
+		action={isEdit ? '?/updateRelationship' : '?/addRelationship'}
 		use:enhance={() => {
+			submitting = true;
 			return async ({ result, update }) => {
 				await update();
+				submitting = false;
 				if (result.type === 'success') {
-					open = false;
-					reset();
+					if (isEdit) {
+						onClose?.();
+					} else {
+						open = false;
+						reset();
+					}
 				}
 			};
 		}}
 		class="mt-3 rounded-sm border border-line bg-muted/40 p-3"
 	>
+		{#if relationship}
+			<input type="hidden" name="relId" value={relationship.id} />
+		{/if}
 		{@render formFields()}
 	</form>
 {/if}
--- a/frontend/src/lib/person/relationship/AddRelationshipForm.svelte.spec.ts
+++ b/frontend/src/lib/person/relationship/AddRelationshipForm.svelte.spec.ts
@@ -8,58 +8,116 @@ vi.mock('$lib/person/PersonTypeahead.svelte', () => ({ default: () => null }));

 afterEach(cleanup);

-describe('AddRelationshipForm', () => {
-	it('shows add-relationship button initially and no form', async () => {
-		render(AddRelationshipForm, { personId: 'person-1' });
+const PID = 'person-1';
+const OTHER = 'person-2';
+
+const editRel = () => ({
+	id: 'rel-9',
+	personId: PID,
+	relatedPersonId: OTHER,
+	personDisplayName: 'Anna Müller',
+	relatedPersonDisplayName: 'Hans Müller',
+	relationType: 'SPOUSE_OF' as const,
+	fromDate: '1923-05-12',
+	fromDatePrecision: 'DAY' as const,
+	toDatePrecision: 'UNKNOWN' as const,
+	notes: 'Hochzeit in Berlin'
+});
+
+describe('AddRelationshipForm — create mode', () => {
+	it('shows the add-relationship toggle initially and no form', async () => {
+		render(AddRelationshipForm, { personId: PID });
 		await expect.element(page.getByRole('button')).toBeInTheDocument();
-		await expect.element(page.getByRole('combobox')).not.toBeInTheDocument();
+		expect(document.querySelector('select[name="relationType"]')).toBeNull();
 	});

-	it('shows relationType select when add button is clicked', async () => {
-		render(AddRelationshipForm, { personId: 'person-1' });
+	it('shows the relationType select when the add toggle is clicked', async () => {
+		render(AddRelationshipForm, { personId: PID });
 		document.querySelector<HTMLButtonElement>('button')!.click();
-		await expect.element(page.getByRole('combobox')).toBeInTheDocument();
+		await expect.element(page.getByRole('combobox', { name: 'Typ' })).toBeInTheDocument();
 	});

-	it('hides form and shows button when cancel is clicked', async () => {
-		render(AddRelationshipForm, { personId: 'person-1' });
+	it('hides the form and shows the toggle again on cancel', async () => {
+		render(AddRelationshipForm, { personId: PID });
 		document.querySelector<HTMLButtonElement>('button')!.click();
-		await expect.element(page.getByRole('combobox')).toBeInTheDocument();
+		await expect.element(page.getByRole('combobox', { name: 'Typ' })).toBeInTheDocument();
 		const cancelBtn = [...document.querySelectorAll<HTMLButtonElement>('button')].find(
 			(b) => b.type === 'button' && /abbrechen/i.test(b.textContent ?? '')
 		);
 		cancelBtn!.click();
-		await expect.element(page.getByRole('combobox')).not.toBeInTheDocument();
+		await vi.waitFor(() =>
+			expect(document.querySelector('select[name="relationType"]')).toBeNull()
+		);
 	});

-	it('submit is disabled when no person is selected', async () => {
-		render(AddRelationshipForm, { personId: 'person-1' });
+	it('disables submit when no person is selected', async () => {
+		render(AddRelationshipForm, { personId: PID });
 		document.querySelector<HTMLButtonElement>('button')!.click();
 		await expect.element(page.getByRole('button', { name: /^Hinzufügen$/i })).toBeDisabled();
 	});

-	it('form has no server action when onSubmit prop is provided', async () => {
+	it('has no server action when an onSubmit prop is provided', async () => {
 		const onSubmit = vi.fn().mockResolvedValue(undefined);
-		render(AddRelationshipForm, { personId: 'person-1', onSubmit });
+		render(AddRelationshipForm, { personId: PID, onSubmit });
 		document.querySelector<HTMLButtonElement>('button')!.click();
-		await expect.element(page.getByRole('combobox')).toBeInTheDocument();
-		const form = document.querySelector('form');
-		expect(form?.hasAttribute('action')).toBe(false);
-	});
-
-	it('shows year-range error when toYear is before fromYear', async () => {
-		render(AddRelationshipForm, { personId: 'person-1' });
-		document.querySelector<HTMLButtonElement>('button')!.click();
-		await expect.element(page.getByRole('combobox')).toBeInTheDocument();
-
-		const fromInput = document.querySelector<HTMLInputElement>('input[name="fromYear"]')!;
-		fromInput.value = '1935';
-		fromInput.dispatchEvent(new InputEvent('input', { bubbles: true }));
-
-		const toInput = document.querySelector<HTMLInputElement>('input[name="toYear"]')!;
-		toInput.value = '1920';
-		toInput.dispatchEvent(new InputEvent('input', { bubbles: true }));
-
-		await expect.element(page.getByRole('alert')).toBeVisible();
+		await expect.element(page.getByRole('combobox', { name: 'Typ' })).toBeInTheDocument();
+		expect(document.querySelector('form')?.hasAttribute('action')).toBe(false);
+	});
+});
+
+describe('AddRelationshipForm — edit mode', () => {
+	it('opens pre-filled and labels the submit "Speichern"', async () => {
+		render(AddRelationshipForm, { personId: PID, relationship: editRel() });
+		await expect.element(page.getByRole('button', { name: /^Speichern$/i })).toBeInTheDocument();
+	});
+
+	it('pre-fills the from-date as dd.mm.yyyy', async () => {
+		render(AddRelationshipForm, { personId: PID, relationship: editRel() });
+		await expect.element(page.getByRole('combobox', { name: 'Typ' })).toBeInTheDocument();
+		const fromInput = document.querySelector<HTMLInputElement>('#fromDate')!;
+		await vi.waitFor(() => expect(fromInput.value).toBe('12.05.1923'));
+	});
+
+	it('round-trips the notes into the textarea', async () => {
+		render(AddRelationshipForm, { personId: PID, relationship: editRel() });
+		await expect.element(page.getByRole('combobox', { name: 'Typ' })).toBeInTheDocument();
+		const notes = document.querySelector<HTMLTextAreaElement>('textarea[name="notes"]')!;
+		await vi.waitFor(() => expect(notes.value).toBe('Hochzeit in Berlin'));
+	});
+
+	it('offers only DAY/MONTH/YEAR in each precision select', async () => {
+		render(AddRelationshipForm, { personId: PID, relationship: editRel() });
+		await expect.element(page.getByRole('combobox', { name: 'Typ' })).toBeInTheDocument();
+		const options = [
+			...document.querySelectorAll<HTMLOptionElement>('#fromDatePrecision option')
+		].map((o) => o.value);
+		expect(options).toEqual(['DAY', 'MONTH', 'YEAR']);
+	});
+
+	it('gives each date input an associated label (accessible name)', async () => {
+		render(AddRelationshipForm, { personId: PID, relationship: editRel() });
+		await expect.element(page.getByRole('combobox', { name: 'Typ' })).toBeInTheDocument();
+		expect(document.querySelector('#fromDate')?.getAttribute('aria-label')).toBe('Beginn (Datum)');
+		expect(document.querySelector('#toDate')?.getAttribute('aria-label')).toBe('Ende (Datum)');
+	});
+
+	it('disables the submit and shows a progress spinner while a submit is in flight', async () => {
+		let resolve: () => void = () => {};
+		const onSubmit = vi.fn(() => new Promise<void>((r) => (resolve = r)));
+		render(AddRelationshipForm, { personId: PID, relationship: editRel(), onSubmit });
+
+		const submit = await vi.waitFor(() => {
+			const b = [...document.querySelectorAll<HTMLButtonElement>('button')].find(
+				(x) => x.type === 'submit'
+			);
+			if (!b) throw new Error('submit not ready');
+			return b;
+		});
+		submit.click();
+
+		await expect.element(page.getByTestId('submit-spinner')).toBeInTheDocument();
+		await vi.waitFor(() => expect(submit.disabled).toBe(true));
+		expect(onSubmit).toHaveBeenCalledOnce();
+		resolve();
 	});
 });
--- a/frontend/src/lib/person/relationship/AddRelationshipForm.svelte.test.ts
+++ b/frontend/src/lib/person/relationship/AddRelationshipForm.svelte.test.ts
@@ -33,36 +33,6 @@ describe('AddRelationshipForm', () => {
 		expect(optionValues).toContain('OTHER');
 	});

-	it('shows the year-error alert when toYear is before fromYear', async () => {
-		render(AddRelationshipForm, { props: { personId: 'p-1' } });
-
-		await page.getByRole('button', { name: /hinzufügen/i }).click();
-
-		const fromInput = document.querySelector('input[name="fromYear"]') as HTMLInputElement;
-		const toInput = document.querySelector('input[name="toYear"]') as HTMLInputElement;
-		fromInput.value = '1923';
-		fromInput.dispatchEvent(new Event('input', { bubbles: true }));
-		toInput.value = '1920';
-		toInput.dispatchEvent(new Event('input', { bubbles: true }));
-
-		await expect.element(page.getByText(/bis-jahr darf nicht vor von-jahr/i)).toBeVisible();
-	});
-
-	it('does not show the year-error when toYear equals fromYear', async () => {
-		render(AddRelationshipForm, { props: { personId: 'p-1' } });
-
-		await page.getByRole('button', { name: /hinzufügen/i }).click();
-
-		const fromInput = document.querySelector('input[name="fromYear"]') as HTMLInputElement;
-		const toInput = document.querySelector('input[name="toYear"]') as HTMLInputElement;
-		fromInput.value = '1923';
-		fromInput.dispatchEvent(new Event('input', { bubbles: true }));
-		toInput.value = '1923';
-		toInput.dispatchEvent(new Event('input', { bubbles: true }));
-
-		await expect.element(page.getByText(/bis-jahr darf nicht/i)).not.toBeInTheDocument();
-	});
-
 	it('cancel button closes the form', async () => {
 		render(AddRelationshipForm, { props: { personId: 'p-1' } });

@@ -136,25 +106,4 @@ describe('AddRelationshipForm', () => {
 			expect(submitBtn!.disabled).toBe(true);
 		});
 	});
-
-	it('keeps submit disabled when there is a yearError', async () => {
-		render(AddRelationshipForm, { props: { personId: 'p-1' } });
-
-		await page.getByRole('button', { name: /hinzufügen/i }).click();
-
-		const fromInput = document.querySelector('input[name="fromYear"]') as HTMLInputElement;
-		const toInput = document.querySelector('input[name="toYear"]') as HTMLInputElement;
-		const relInput = document.querySelector('input[name="relatedPersonId"]') as HTMLInputElement;
-		fromInput.value = '1923';
-		fromInput.dispatchEvent(new Event('input', { bubbles: true }));
-		toInput.value = '1920';
-		toInput.dispatchEvent(new Event('input', { bubbles: true }));
-		relInput.value = 'p-other';
-		relInput.dispatchEvent(new Event('input', { bubbles: true }));
-
-		await vi.waitFor(() => {
-			const submitBtn = document.querySelector('button[type="submit"]') as HTMLButtonElement;
-			expect(submitBtn.disabled).toBe(true);
-		});
-	});
 });
--- a/frontend/src/lib/person/relationship/RelationshipChip.svelte
+++ b/frontend/src/lib/person/relationship/RelationshipChip.svelte
@@ -5,12 +5,13 @@ import { m } from '$lib/paraglide/messages.js';
 interface Props {
 	chipLabel: string;
 	otherName: string;
-	yearRange?: string;
+	dateRange?: string;
 	canWrite: boolean;
 	relId: string;
+	onEdit?: () => void;
 }

-let { chipLabel, otherName, yearRange = '', canWrite, relId }: Props = $props();
+let { chipLabel, otherName, dateRange = '', canWrite, relId, onEdit }: Props = $props();
 </script>

 <li class="flex items-center gap-2 py-2">
@@ -22,8 +23,31 @@ let { chipLabel, otherName, yearRange = '', canWrite, relId }: Props = $props();
 	<span class="min-w-0 flex-1 truncate font-serif text-sm text-ink">
 		{otherName}
 	</span>
-	{#if yearRange}
-		<span class="shrink-0 font-sans text-xs text-ink-3" data-testid="year-range">{yearRange}</span>
+	{#if dateRange}
+		<span class="shrink-0 font-sans text-xs text-ink-3" data-testid="date-range">{dateRange}</span>
+	{/if}
+	{#if canWrite && onEdit}
+		<button
+			type="button"
+			onclick={onEdit}
+			aria-label="{m.relation_edit()} — {otherName}"
+			class="inline-flex h-11 w-11 items-center justify-center text-ink-3 transition-colors hover:text-primary"
+		>
+			<svg
+				class="h-3.5 w-3.5"
+				viewBox="0 0 24 24"
+				fill="none"
+				stroke="currentColor"
+				stroke-width="2"
+				aria-hidden="true"
+			>
+				<path
+					stroke-linecap="round"
+					stroke-linejoin="round"
+					d="M16.862 4.487l1.687-1.688a1.875 1.875 0 112.652 2.652L10.582 16.07a4.5 4.5 0 01-1.897 1.13L6 18l.8-2.685a4.5 4.5 0 011.13-1.897l8.932-8.931z"
+				/>
+			</svg>
+		</button>
 	{/if}
 	{#if canWrite}
 		<form method="POST" action="?/deleteRelationship" use:enhance class="shrink-0">
--- a/frontend/src/lib/person/relationship/RelationshipChip.svelte.spec.ts
+++ b/frontend/src/lib/person/relationship/RelationshipChip.svelte.spec.ts
@@ -10,7 +10,7 @@ afterEach(cleanup);
 const baseProps = {
 	chipLabel: 'Elternteil',
 	otherName: 'Anna Schmidt',
-	yearRange: '',
+	dateRange: '',
 	canWrite: false,
 	relId: 'rel-1'
 };
@@ -26,30 +26,55 @@ describe('RelationshipChip', () => {
 		await expect.element(page.getByText('Anna Schmidt')).toBeInTheDocument();
 	});

-	it('shows year range when provided', async () => {
-		render(RelationshipChip, { ...baseProps, yearRange: '1920–1980' });
-		await expect.element(page.getByText('1920–1980')).toBeInTheDocument();
+	it('shows the date range when provided', async () => {
+		render(RelationshipChip, { ...baseProps, dateRange: '12. Mai 1923 – 1958' });
+		await expect.element(page.getByText('12. Mai 1923 – 1958')).toBeInTheDocument();
 	});

-	it('does not show year range span when empty', async () => {
-		render(RelationshipChip, { ...baseProps, yearRange: '' });
-		expect(document.querySelector('[data-testid="year-range"]')).toBeNull();
+	it('does not render a date-range span when empty', async () => {
+		render(RelationshipChip, { ...baseProps, dateRange: '' });
+		expect(document.querySelector('[data-testid="date-range"]')).toBeNull();
 	});

-	it('shows delete button when canWrite is true', async () => {
+	it('shows the delete button when canWrite is true', async () => {
 		render(RelationshipChip, { ...baseProps, canWrite: true });
 		await expect.element(page.getByRole('button')).toBeInTheDocument();
 	});

-	it('hides delete button when canWrite is false', async () => {
+	it('hides the delete button when canWrite is false', async () => {
 		render(RelationshipChip, { ...baseProps, canWrite: false });
 		expect(document.querySelector('button')).toBeNull();
 	});

-	it('delete button has h-11 w-11 (44px) WCAG touch target class', async () => {
+	it('gives the delete button an h-11 w-11 (44px) WCAG touch target', async () => {
 		render(RelationshipChip, { ...baseProps, canWrite: true });
 		const btn = document.querySelector('button')!;
 		expect(btn.className).toContain('h-11');
 		expect(btn.className).toContain('w-11');
 	});
+
+	it('shows an Edit affordance with an accessible name when canWrite and onEdit', async () => {
+		render(RelationshipChip, { ...baseProps, canWrite: true, onEdit: () => {} });
+		await expect
+			.element(page.getByRole('button', { name: /Beziehung bearbeiten/i }))
+			.toBeInTheDocument();
+	});
+
+	it('does not show the Edit affordance without onEdit', async () => {
+		render(RelationshipChip, { ...baseProps, canWrite: true });
+		expect(document.querySelector('button[aria-label*="bearbeiten"]')).toBeNull();
+	});
+
+	it('does not show the Edit affordance when canWrite is false', async () => {
+		render(RelationshipChip, { ...baseProps, canWrite: false, onEdit: () => {} });
+		expect(document.querySelector('button[aria-label*="bearbeiten"]')).toBeNull();
+	});
+
+	it('calls onEdit when the Edit affordance is clicked', async () => {
+		const onEdit = vi.fn();
+		render(RelationshipChip, { ...baseProps, canWrite: true, onEdit });
+		const editBtn = document.querySelector<HTMLButtonElement>('button[aria-label*="bearbeiten"]')!;
+		editBtn.click();
+		expect(onEdit).toHaveBeenCalledOnce();
+	});
 });
--- a/frontend/src/lib/person/relationship/RelationshipDateField.svelte
+++ b/frontend/src/lib/person/relationship/RelationshipDateField.svelte
@@ -0,0 +1,97 @@
+<script lang="ts">
+import { onMount } from 'svelte';
+import { m } from '$lib/paraglide/messages.js';
+import DateInput from '$lib/shared/primitives/DateInput.svelte';
+import type { DatePrecision } from '$lib/shared/utils/documentDate';
+
+// Only DAY / MONTH / YEAR are offered (same as the person life-date field and the
+// 60+ author audience). Storage still accepts all seven precisions; SEASON/RANGE/
+// APPROX render correctly elsewhere but make no sense to enter for a relationship.
+const RELATIONSHIP_DATE_PRECISIONS: { value: DatePrecision; label: () => string }[] = [
+	{ value: 'DAY', label: m.relation_precision_day },
+	{ value: 'MONTH', label: m.relation_precision_month },
+	{ value: 'YEAR', label: m.relation_precision_year }
+];
+
+let {
+	name,
+	legend,
+	initialIso = '',
+	initialPrecision = null
+}: {
+	name: string;
+	legend: string;
+	initialIso?: string | null;
+	initialPrecision?: string | null;
+} = $props();
+
+let iso = $state('');
+let errorMessage = $state<string | null>(null);
+let inputEl = $state<HTMLInputElement | undefined>();
+let precision = $state<DatePrecision>('DAY');
+
+// Seed once at mount so a later load() rerun does not stomp an in-progress edit.
+onMount(() => {
+	if (initialIso) {
+		iso = initialIso;
+	}
+	const offered = RELATIONSHIP_DATE_PRECISIONS.some((p) => p.value === initialPrecision);
+	if (offered) {
+		precision = initialPrecision as DatePrecision;
+	} else if (initialIso) {
+		// A stored non-offered precision (SEASON/RANGE/APPROX) seeds as YEAR so an
+		// untouched save does not silently claim DAY precision for the stored date.
+		precision = 'YEAR';
+	}
+});
+
+// A partial date leaves the hidden ISO empty — block native submission until the
+// date is completed or fully emptied, so a save can never silently clear a date.
+$effect(() => {
+	inputEl?.setCustomValidity(errorMessage ?? '');
+});
+
+const controlCls =
+	'block min-h-[44px] w-full rounded border border-line px-3 py-2 font-serif text-ink focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring';
+</script>
+
+<fieldset>
+	<legend class="mb-1 block text-xs font-bold tracking-widest text-ink-3 uppercase">
+		{legend}
+	</legend>
+	<div class="flex flex-col gap-2 sm:flex-row">
+		<div class="flex-1">
+			<DateInput
+				bind:value={iso}
+				bind:errorMessage={errorMessage}
+				bind:inputEl={inputEl}
+				name={name}
+				id={name}
+				placeholder="TT.MM.JJJJ"
+				ariaLabel={legend}
+				ariaDescribedby={errorMessage ? `${name}-error` : undefined}
+				class="{controlCls} bg-surface"
+			/>
+			{#if errorMessage}
+				<p id="{name}-error" class="mt-1 font-sans text-xs text-red-600">{errorMessage}</p>
+			{/if}
+		</div>
+		<div class="flex-1">
+			<label class="sr-only" for="{name}Precision"
+				>{legend}: {m.relation_label_date_precision()}</label
+			>
+			<select
+				id="{name}Precision"
+				name="{name}Precision"
+				aria-label="{legend}: {m.relation_label_date_precision()}"
+				bind:value={precision}
+				class="{controlCls} bg-surface text-ink-3"
+			>
+				{#each RELATIONSHIP_DATE_PRECISIONS as p (p.value)}
+					<option value={p.value}>{p.label()}</option>
+				{/each}
+			</select>
+		</div>
+	</div>
+	<p class="mt-1 font-sans text-xs text-ink-3">{m.relation_date_placeholder_hint()}</p>
+</fieldset>
--- a/frontend/src/lib/person/relationshipLabels.test.ts
+++ b/frontend/src/lib/person/relationshipLabels.test.ts
@@ -19,6 +19,8 @@ function makeRel(
 		personDisplayName: 'Alice',
 		relatedPersonDisplayName: 'Bob',
 		relationType,
+		fromDatePrecision: 'UNKNOWN',
+		toDatePrecision: 'UNKNOWN',
 		...override
 	};
 }
--- a/frontend/src/routes/persons/[id]/PersonRelationshipsCard.svelte
+++ b/frontend/src/routes/persons/[id]/PersonRelationshipsCard.svelte
@@ -1,6 +1,7 @@
 <script lang="ts">
 import { m } from '$lib/paraglide/messages.js';
 import { chipLabel, otherName, inferredRelationshipLabel } from '$lib/person/relationshipLabels';
+import { formatRelationshipDateRange } from '$lib/person/relationshipDates';
 import type { components } from '$lib/generated/api';

 type RelationshipDTO = components['schemas']['RelationshipDTO'];
@@ -35,18 +36,37 @@ function otherId(rel: RelationshipDTO): string {
 		{#if relationships.length > 0}
 			<ul class="mb-4 space-y-2">
 				{#each relationships as rel (rel.id)}
-					<li class="flex items-center gap-2">
-						<span
-							class="inline-flex shrink-0 items-center rounded-full border border-accent/40 bg-accent/15 px-2 py-0.5 font-sans text-xs font-bold tracking-widest text-ink uppercase"
-						>
-							{chipLabel(rel, personId)}
-						</span>
-						<a
-							href="/persons/{otherId(rel)}"
-							class="min-w-0 flex-1 truncate font-serif text-sm text-ink hover:underline"
-						>
-							{otherName(rel, personId)}
-						</a>
+					{@const dateRange = formatRelationshipDateRange(
+						rel.fromDate,
+						rel.fromDatePrecision,
+						rel.toDate,
+						rel.toDatePrecision
+					)}
+					<li class="flex flex-col gap-0.5">
+						<div class="flex items-center gap-2">
+							<span
+								class="inline-flex shrink-0 items-center rounded-full border border-accent/40 bg-accent/15 px-2 py-0.5 font-sans text-xs font-bold tracking-widest text-ink uppercase"
+							>
+								{chipLabel(rel, personId)}
+							</span>
+							<a
+								href="/persons/{otherId(rel)}"
+								class="min-w-0 flex-1 truncate font-serif text-sm text-ink hover:underline"
+							>
+								{otherName(rel, personId)}
+							</a>
+							{#if dateRange}
+								<span
+									class="shrink-0 font-sans text-xs text-ink-3"
+									data-testid="relationship-date-range">{dateRange}</span
+								>
+							{/if}
+						</div>
+						{#if rel.notes}
+							<p class="pl-1 font-serif text-xs text-ink-2 italic" data-testid="relationship-notes">
+								{rel.notes}
+							</p>
+						{/if}
 					</li>
 				{/each}
 			</ul>
--- a/frontend/src/routes/persons/[id]/PersonRelationshipsCard.svelte.test.ts
+++ b/frontend/src/routes/persons/[id]/PersonRelationshipsCard.svelte.test.ts
@@ -18,7 +18,9 @@ describe('PersonRelationshipsCard', () => {
 					relatedPersonId: SPOUSE_ID,
 					personDisplayName: 'Anna Müller',
 					relatedPersonDisplayName: 'Bertha Müller',
-					relationType: 'SPOUSE_OF'
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			inferredRelationships: [
@@ -65,7 +67,9 @@ describe('PersonRelationshipsCard', () => {
 					relatedPersonId: PARENT_ID,
 					personDisplayName: 'Anna Müller',
 					relatedPersonDisplayName: 'Kind Müller',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			inferredRelationships: []
@@ -84,7 +88,9 @@ describe('PersonRelationshipsCard', () => {
 					relatedPersonId: SPOUSE_ID,
 					personDisplayName: 'Anna',
 					relatedPersonDisplayName: 'Bertha',
-					relationType: 'SPOUSE_OF'
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			inferredRelationships: [
@@ -113,7 +119,9 @@ describe('PersonRelationshipsCard', () => {
 					relatedPersonId: PERSON_ID,
 					personDisplayName: 'Eltern Müller',
 					relatedPersonDisplayName: 'Anna Müller',
-					relationType: 'PARENT_OF'
+					relationType: 'PARENT_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
 				}
 			],
 			inferredRelationships: []
@@ -121,4 +129,74 @@ describe('PersonRelationshipsCard', () => {

 		await expect.element(page.getByText('Kind von')).toBeInTheDocument();
 	});
+
+	it('renders the date range at its stored precision', async () => {
+		render(PersonRelationshipsCard, {
+			personId: PERSON_ID,
+			relationships: [
+				{
+					id: 'r1',
+					personId: PERSON_ID,
+					relatedPersonId: SPOUSE_ID,
+					personDisplayName: 'Anna Müller',
+					relatedPersonDisplayName: 'Bertha Müller',
+					relationType: 'SPOUSE_OF',
+					fromDate: '1923-05-12',
+					fromDatePrecision: 'DAY',
+					toDatePrecision: 'UNKNOWN'
+				}
+			],
+			inferredRelationships: []
+		});
+
+		await expect
+			.element(page.getByTestId('relationship-date-range'))
+			.toHaveTextContent('12. Mai 1923');
+	});
+
+	it('shows the notes line', async () => {
+		render(PersonRelationshipsCard, {
+			personId: PERSON_ID,
+			relationships: [
+				{
+					id: 'r1',
+					personId: PERSON_ID,
+					relatedPersonId: SPOUSE_ID,
+					personDisplayName: 'Anna Müller',
+					relatedPersonDisplayName: 'Bertha Müller',
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN',
+					notes: 'Hochzeit in Berlin'
+				}
+			],
+			inferredRelationships: []
+		});
+
+		await expect
+			.element(page.getByTestId('relationship-notes'))
+			.toHaveTextContent('Hochzeit in Berlin');
+	});
+
+	it('renders no date line when the relationship has no dates', async () => {
+		render(PersonRelationshipsCard, {
+			personId: PERSON_ID,
+			relationships: [
+				{
+					id: 'r1',
+					personId: PERSON_ID,
+					relatedPersonId: SPOUSE_ID,
+					personDisplayName: 'Anna Müller',
+					relatedPersonDisplayName: 'Bertha Müller',
+					relationType: 'SPOUSE_OF',
+					fromDatePrecision: 'UNKNOWN',
+					toDatePrecision: 'UNKNOWN'
+				}
+			],
+			inferredRelationships: []
+		});
+
+		await expect.element(page.getByText('Bertha Müller')).toBeInTheDocument();
+		expect(document.querySelector('[data-testid="relationship-date-range"]')).toBeNull();
+	});
 });
--- a/frontend/src/routes/persons/[id]/edit/+page.server.ts
+++ b/frontend/src/routes/persons/[id]/edit/+page.server.ts
@@ -2,12 +2,40 @@ import { error, fail, redirect } from '@sveltejs/kit';
 import { createApiClient, extractErrorCode } from '$lib/shared/api.server';
 import { getErrorMessage } from '$lib/shared/errors';
 import type { DatePrecision } from '$lib/shared/utils/documentDate';
+import type { components } from '$lib/generated/api';
 import {
 	normalizePersonType,
 	validatePersonFields,
 	resolveValidationMessage
 } from '$lib/person/person-validation';

+type RelationType = NonNullable<components['schemas']['RelationshipUpsertRequest']['relationType']>;
+
+// Parses the shared relationship create/update form into a RelationshipUpsertRequest
+// body. An empty date omits date AND precision so the backend normalises the pair to
+// null/UNKNOWN — a lone precision would fail the coherence check (INVALID_DATE_PRECISION).
+function parseRelationshipForm(formData: FormData) {
+	const relatedPersonId = formData.get('relatedPersonId')?.toString();
+	const relationType = formData.get('relationType')?.toString();
+	const notes = formData.get('notes')?.toString().trim() || undefined;
+	const fromDate = formData.get('fromDate')?.toString().trim() || undefined;
+	const fromDatePrecision = fromDate
+		? (formData.get('fromDatePrecision')?.toString() as DatePrecision)
+		: undefined;
+	const toDate = formData.get('toDate')?.toString().trim() || undefined;
+	const toDatePrecision = toDate
+		? (formData.get('toDatePrecision')?.toString() as DatePrecision)
+		: undefined;
+	const body = {
+		relatedPersonId: relatedPersonId ?? '',
+		relationType: (relationType ?? 'OTHER') as RelationType,
+		...(fromDate ? { fromDate, fromDatePrecision } : {}),
+		...(toDate ? { toDate, toDatePrecision } : {}),
+		...(notes ? { notes } : {})
+	};
+	return { relatedPersonId, relationType, body };
+}
+
 export async function load({ params, fetch, locals }) {
 	const canWrite =
 		(locals.user as { groups?: { permissions: string[] }[] } | undefined)?.groups?.some((g) =>
@@ -193,40 +221,45 @@ export const actions = {

 	addRelationship: async ({ request, params, fetch }) => {
 		const formData = await request.formData();
-		const relatedPersonId = formData.get('relatedPersonId')?.toString();
-		const relationType = formData.get('relationType')?.toString();
-		const fromYearRaw = formData.get('fromYear')?.toString().trim();
-		const toYearRaw = formData.get('toYear')?.toString().trim();
-		const notes = formData.get('notes')?.toString().trim() || undefined;
+		const fields = parseRelationshipForm(formData);

-		if (!relatedPersonId || !relationType) {
+		if (!fields.relatedPersonId || !fields.relationType) {
 			return fail(400, { relationshipError: getErrorMessage('VALIDATION_ERROR') });
 		}
-		if (relatedPersonId === params.id) {
-			return fail(400, { relationshipError: getErrorMessage('VALIDATION_ERROR') });
-		}
-		const fromYear = fromYearRaw ? parseInt(fromYearRaw, 10) : undefined;
-		const toYear = toYearRaw ? parseInt(toYearRaw, 10) : undefined;
-		if (
-			fromYear !== undefined &&
-			toYear !== undefined &&
-			!Number.isNaN(fromYear) &&
-			!Number.isNaN(toYear) &&
-			toYear < fromYear
-		) {
+		if (fields.relatedPersonId === params.id) {
 			return fail(400, { relationshipError: getErrorMessage('VALIDATION_ERROR') });
 		}

 		const api = createApiClient(fetch);
 		const result = await api.POST('/api/persons/{id}/relationships', {
 			params: { path: { id: params.id } },
-			body: {
-				relatedPersonId,
-				relationType,
-				...(fromYear !== undefined && !Number.isNaN(fromYear) ? { fromYear } : {}),
-				...(toYear !== undefined && !Number.isNaN(toYear) ? { toYear } : {}),
-				...(notes ? { notes } : {})
-			}
+			body: fields.body
+		});
+
+		if (!result.response.ok) {
+			return fail(result.response.status, {
+				relationshipError: getErrorMessage(extractErrorCode(result.error))
+			});
+		}
+		return { relationshipSuccess: true };
+	},
+
+	updateRelationship: async ({ request, params, fetch }) => {
+		const formData = await request.formData();
+		const relId = formData.get('relId')?.toString();
+		const fields = parseRelationshipForm(formData);
+
+		if (!relId || !fields.relatedPersonId || !fields.relationType) {
+			return fail(400, { relationshipError: getErrorMessage('VALIDATION_ERROR') });
+		}
+		if (fields.relatedPersonId === params.id) {
+			return fail(400, { relationshipError: getErrorMessage('VALIDATION_ERROR') });
+		}
+
+		const api = createApiClient(fetch);
+		const result = await api.PUT('/api/persons/{id}/relationships/{relId}', {
+			params: { path: { id: params.id, relId } },
+			body: fields.body
 		});

 		if (!result.response.ok) {
--- a/frontend/src/routes/persons/[id]/edit/page.server.spec.ts
+++ b/frontend/src/routes/persons/[id]/edit/page.server.spec.ts
@@ -97,3 +97,98 @@ describe('persons/[id]/edit update action — generation (#689)', () => {
 		expect(body).toHaveProperty('generation', 3);
 	});
 });
+
+describe('persons/[id]/edit relationship actions (#837)', () => {
+	function relForm(overrides: Record<string, string | null> = {}): Request {
+		const fd = new FormData();
+		fd.set('relatedPersonId', 'p2');
+		fd.set('relationType', 'SPOUSE_OF');
+		for (const [k, v] of Object.entries(overrides)) {
+			if (v == null) fd.delete(k);
+			else fd.set(k, v);
+		}
+		return new Request('http://localhost/persons/p1/edit', { method: 'POST', body: fd });
+	}
+
+	it('addRelationship posts date + precision + notes', async () => {
+		const post = vi.fn().mockResolvedValue({ response: { ok: true, status: 200 }, data: {} });
+		vi.mocked(createApiClient).mockReturnValue({ POST: post } as unknown as ReturnType<
+			typeof createApiClient
+		>);
+		const request = relForm({
+			fromDate: '1923-05-12',
+			fromDatePrecision: 'DAY',
+			notes: 'Hochzeit'
+		});
+
+		// eslint-disable-next-line @typescript-eslint/no-explicit-any
+		await actions.addRelationship({ request, params: { id: 'p1' }, fetch: mockFetch } as any);
+
+		const [path, opts] = post.mock.calls[0];
+		expect(path).toBe('/api/persons/{id}/relationships');
+		expect(opts.body).toMatchObject({
+			relatedPersonId: 'p2',
+			relationType: 'SPOUSE_OF',
+			fromDate: '1923-05-12',
+			fromDatePrecision: 'DAY',
+			notes: 'Hochzeit'
+		});
+	});
+
+	it('addRelationship omits precision when the date is empty (coherence)', async () => {
+		const post = vi.fn().mockResolvedValue({ response: { ok: true, status: 200 }, data: {} });
+		vi.mocked(createApiClient).mockReturnValue({ POST: post } as unknown as ReturnType<
+			typeof createApiClient
+		>);
+		const request = relForm({ fromDatePrecision: 'DAY' }); // precision but no date
+
+		// eslint-disable-next-line @typescript-eslint/no-explicit-any
+		await actions.addRelationship({ request, params: { id: 'p1' }, fetch: mockFetch } as any);
+
+		const body = post.mock.calls[0][1].body;
+		expect(body).not.toHaveProperty('fromDate');
+		expect(body).not.toHaveProperty('fromDatePrecision');
+	});
+
+	it('updateRelationship PUTs to the relId path with the new body', async () => {
+		const put = vi.fn().mockResolvedValue({ response: { ok: true, status: 200 }, data: {} });
+		vi.mocked(createApiClient).mockReturnValue({ PUT: put } as unknown as ReturnType<
+			typeof createApiClient
+		>);
+		const request = relForm({ relId: 'rel-9', fromDate: '1923-05-12', fromDatePrecision: 'DAY' });
+
+		// eslint-disable-next-line @typescript-eslint/no-explicit-any
+		await actions.updateRelationship({ request, params: { id: 'p1' }, fetch: mockFetch } as any);
+
+		const [path, opts] = put.mock.calls[0];
+		expect(path).toBe('/api/persons/{id}/relationships/{relId}');
+		expect(opts.params.path).toMatchObject({ id: 'p1', relId: 'rel-9' });
+		expect(opts.body).toMatchObject({
+			relatedPersonId: 'p2',
+			relationType: 'SPOUSE_OF',
+			fromDate: '1923-05-12',
+			fromDatePrecision: 'DAY'
+		});
+	});
+
+	it('updateRelationship surfaces a backend error as a fail', async () => {
+		const put = vi.fn().mockResolvedValue({
+			response: { ok: false, status: 400 },
+			error: { code: 'INVALID_RELATIONSHIP_DATES' }
+		});
+		vi.mocked(createApiClient).mockReturnValue({ PUT: put } as unknown as ReturnType<
+			typeof createApiClient
+		>);
+		const request = relForm({ relId: 'rel-9' });
+
+		const result = (await actions.updateRelationship({
+			request,
+			params: { id: 'p1' },
+			fetch: mockFetch
+			// eslint-disable-next-line @typescript-eslint/no-explicit-any
+		} as any)) as { status: number; data: { relationshipError: string } };
+
+		expect(result.status).toBe(400);
+		expect(result.data.relationshipError).toBeTruthy();
+	});
+});