docs(relationship): ADR-044, DB diagrams, deploy runbook, RTM rows

- ADR-044 extends ADR-039 to the relationship edge: LocalDate+DatePrecision,
  update re-validation of create invariants, no @Version (last-write-wins),
  DELETE→404 anti-enumeration alignment, precise derived marriage date, and the
  relationshipDates.ts location reusing the existing person→shared boundary.
- db-orm.puml: person_relationships now carries from_date/from_date_precision/
  to_date/to_date_precision; db-relationships.puml gets a V78 columns-only note.
- DEPLOYMENT.md §5: V78 deploy note — no maintenance window, stop-old-then-start
  ordering (not rolling-deploy-safe), targeted pg_restore rollback.
- CLAUDE.md error-code list gains INVALID_RELATIONSHIP_DATES.
- rtm.md: REQ-001..REQ-019 for #837 mapped to impl + tests, all Done.

Refs #837
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.specify/rtm.md

@@ -139,3 +139,22 @@
 | REQ-014 | no change to DTO order, density threshold (12), gap-folding, or ol/section/h2 structure | #833 | zeitstrahl-visual-fidelity | `frontend/src/lib/timeline/*` | existing timeline + `zeitstrahl/page.server.test.ts` suites stay green (142 tests) | Done |
 | REQ-015 | new user-facing strings are Paraglide keys present in de/en/es with matching key sets | #833 | zeitstrahl-visual-fidelity | `frontend/messages/{de,en,es}.json` | `messages.spec.ts#zeitstrahl visual-fidelity keys are present in all locales`, `#identical key sets` | Done |
 | REQ-016 | LetterCard with no title → no ✉, no sr-only "Brief"; sender→receiver + date still render | #833 | zeitstrahl-visual-fidelity | `frontend/src/lib/timeline/LetterCard.svelte` | `LetterCard.svelte.spec.ts#renders no ✉ glyph and no "Brief" label when the title is empty` | Done |
+| REQ-001 | store relationship from/to as nullable LocalDate + NOT-NULL DatePrecision (default UNKNOWN) | #837 | relationship-edit-dates | `person/relationship/PersonRelationship.java`, `V78__relationship_years_to_localdate.sql` | `RelationshipMigrationTest#yearColumnsDropped_andNamedCheckConstraintsExist`, `RelationshipServiceTest#addRelationship_persists_with_storage_truth` | Done |
+| REQ-002 | V78 backfills non-null years as `{year}-01-01`/YEAR, nulls → null/UNKNOWN, rows preserved | #837 | relationship-edit-dates | `V78__relationship_years_to_localdate.sql` | `RelationshipMigrationTest#backfill_fromYearAndToYear_becomeYearPrecisionDates`, `#backfill_bothNull_leavesDatesNullAndPrecisionsUnknown`, `#backfill_preservesRowCount` | Done |
+| REQ-003 | named DB CHECKs: coherence both ends + fromDate ≤ toDate | #837 | relationship-edit-dates | `V78__relationship_years_to_localdate.sql` | `RelationshipMigrationTest#orderCheckConstraint_rejectsToDateBeforeFromDate`, `#coherenceCheckConstraint_rejectsDatePresentWithUnknownPrecision` | Done |
+| REQ-004 | PUT updates the relationship → 200 RelationshipDTO | #837 | relationship-edit-dates | `person/relationship/RelationshipController#updateRelationship`, `RelationshipService#updateRelationship` | `RelationshipControllerTest#updateRelationship_returns200_with_RelationshipDTO_for_WRITE_ALL_user`, `RelationshipServiceIntegrationTest#updateRelationship_persists_new_type_dates_and_notes`, `page.server.spec.ts#updateRelationship PUTs to the relId path with the new body` | Done |
+| REQ-005 | create + update rejected with 403 without WRITE_ALL | #837 | relationship-edit-dates | `person/relationship/RelationshipController` (`@RequirePermission`) | `RelationshipControllerTest#updateRelationship_returns403_for_READ_ALL_only_user`, `#addRelationship_returns403_for_user_with_READ_ALL_only` | Done |
+| REQ-006 | relId not existing / not owned by person → 404 RELATIONSHIP_NOT_FOUND | #837 | relationship-edit-dates | `person/relationship/RelationshipService#loadOwnedRelationship` | `RelationshipServiceTest#updateRelationship_throws_NOT_FOUND_when_rel_belongs_to_different_person`, `RelationshipServiceIntegrationTest#updateRelationship_throws_404_when_rel_belongs_to_different_person` | Done |
+| REQ-007 | update with relatedPersonId == {id} → 400 VALIDATION_ERROR | #837 | relationship-edit-dates | `person/relationship/RelationshipService#updateRelationship` | `RelationshipServiceTest#updateRelationship_throws_VALIDATION_ERROR_on_self_relation` | Done |
+| REQ-008 | resulting (person, relatedPerson, type) duplicate → 409 DUPLICATE_RELATIONSHIP | #837 | relationship-edit-dates | `person/relationship/RelationshipService#updateRelationship` | `RelationshipServiceTest#updateRelationship_throws_DUPLICATE_when_db_constraint_violated` | Done |
+| REQ-009 | update to PARENT_OF with reverse PARENT_OF present → 409 CIRCULAR_RELATIONSHIP | #837 | relationship-edit-dates | `person/relationship/RelationshipService#updateRelationship` | `RelationshipServiceTest#updateRelationship_throws_CIRCULAR_when_reverse_PARENT_OF_exists` | Done |
+| REQ-010 | toDate before fromDate → 400 INVALID_RELATIONSHIP_DATES | #837 | relationship-edit-dates | `person/relationship/RelationshipService#validateRelationshipDates`, `exception/ErrorCode`, `frontend/src/lib/shared/errors.ts` | `RelationshipServiceTest#addRelationship_throws_INVALID_RELATIONSHIP_DATES_when_toDate_before_fromDate`, `#updateRelationship_throws_INVALID_RELATIONSHIP_DATES_when_toDate_before_fromDate` | Done |
+| REQ-011 | date+UNKNOWN precision, or precision without date → 400 INVALID_DATE_PRECISION | #837 | relationship-edit-dates | `person/relationship/RelationshipService#requireDatePrecisionCoherence` | `RelationshipServiceTest#addRelationship_throws_INVALID_DATE_PRECISION_when_date_present_but_precision_unknown`, `#addRelationship_throws_INVALID_DATE_PRECISION_when_precision_set_without_date` | Done |
+| REQ-012 | invalid enum / missing relatedPersonId·relationType / notes > 2000 → 400 VALIDATION_ERROR | #837 | relationship-edit-dates | `person/relationship/RelationshipUpsertRequest` (Bean Validation), `RelationshipController` | `RelationshipControllerTest#updateRelationship_returns400_when_relationType_is_unknown_value`, `#addRelationship_returns400_when_relationType_is_unknown_value` | Done |
+| REQ-013 | updating into a family type flags both endpoints (additive) | #837 | relationship-edit-dates | `person/relationship/RelationshipService#updateRelationship` | `RelationshipServiceTest#updateRelationship_marks_both_endpoints_family_when_updated_to_family_type` | Done |
+| REQ-014 | persist + display notes on create, update, read and edit views | #837 | relationship-edit-dates | `person/relationship/RelationshipService`, `frontend/.../AddRelationshipForm.svelte`, `routes/persons/[id]/PersonRelationshipsCard.svelte` | `RelationshipServiceIntegrationTest#updateRelationship_persists_new_type_dates_and_notes`, `AddRelationshipForm.svelte.spec.ts#round-trips the notes into the textarea`, `PersonRelationshipsCard.svelte.test.ts#shows the notes line` | Done |
+| REQ-015 | detail view shows the date range at its precision; no dates → no date line | #837 | relationship-edit-dates | `frontend/src/lib/person/relationshipDates.ts`, `routes/persons/[id]/PersonRelationshipsCard.svelte` | `relationshipDates.spec.ts`, `PersonRelationshipsCard.svelte.test.ts#renders the date range at its stored precision`, `#renders no date line when the relationship has no dates` | Done |
+| REQ-016 | edit affordance opens a form pre-filled with type/person/dates+precision/notes; precision DAY/MONTH/YEAR | #837 | relationship-edit-dates | `frontend/.../AddRelationshipForm.svelte`, `RelationshipDateField.svelte`, `RelationshipChip.svelte` | `AddRelationshipForm.svelte.spec.ts#pre-fills the from-date as dd.mm.yyyy`, `#offers only DAY/MONTH/YEAR in each precision select`, `RelationshipChip.svelte.spec.ts#shows an Edit affordance with an accessible name when canWrite and onEdit` | Done |
+| REQ-017 | derived Heirat sources SPOUSE_OF.fromDate + fromDatePrecision | #837 | relationship-edit-dates | `timeline/TimelineEventService#buildMarriageEvents` | `DerivedEventsAssemblyTest#should_emit_day_precision_heirat_from_spouse_fromDate` | Done |
+| REQ-018 | unauthenticated PUT → 401, no row modified | #837 | relationship-edit-dates | `person/relationship/RelationshipController` (SecurityConfig) | `RelationshipControllerTest#updateRelationship_returns401_whenUnauthenticated_and_does_not_touch_service` | Done |
+| REQ-019 | while a create/update request is in flight, submit is disabled + shows a progress indicator | #837 | relationship-edit-dates | `frontend/src/lib/person/relationship/AddRelationshipForm.svelte` | `AddRelationshipForm.svelte.spec.ts#disables the submit and shows a progress spinner while a submit is in flight` | Done |