docs: update ARCHITECTURE, GLOSSARY, db diagram for JourneyItem and Lesereise

- ARCHITECTURE.md: expand geschichte domain description — two subtypes
  (STORY/JOURNEY), JourneyItem ownership, ON DELETE SET NULL FK note
- GLOSSARY.md: add JourneyItem and Lesereise terms; update Geschichte
  entry to mention type discriminator
- db-relationships.puml: replace geschichten_documents with journey_items
  (ON DELETE CASCADE to geschichten, ON DELETE SET NULL to documents)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/ARCHITECTURE.md

@@ -38,7 +38,7 @@ Both stacks are organised **package-by-domain**: each domain owns its entities,
 
 **`user`** — login accounts and permission groups. Owns `AppUser`, `UserGroup`, invite tokens. Does NOT own `Person` records. Cross-domain deps: `audit` (user management events).
 
-**`geschichte`** — family stories. Owns `Geschichte` (`DRAFT → PUBLISHED` lifecycle). Cross-domain deps: `person`, `document` (linked entities in the story body).
+**`geschichte`** — family stories and Lesereisen. Owns `Geschichte` (`DRAFT → PUBLISHED` lifecycle) and `JourneyItem` (ordered stops in a JOURNEY-type Geschichte). Two subtypes: `STORY` (prose) and `JOURNEY` (curated document sequence). Cross-domain deps: `person` (linked persons), `document` (via `JourneyItem.document_id`, ON DELETE SET NULL).
 
 **`notification`** — in-app messages. Owns `Notification`. Delivers via `SseEmitterRegistry` (live) and persisted rows (bell dropdown). Cross-domain deps: `user` (recipient), `document` (context).
 

docs/GLOSSARY.md

@@ -149,7 +149,11 @@ _See also [Chronik](#chronik-internal)._
 
 **Chronik** `[internal]` — the conceptual and code-level name for the unified activity feed (per ADR-003 `003-chronik-unified-activity-feed.md`). Used in code, architecture documents, and ADRs. The user-facing label for the same concept is [Aktivität](#aktivitat--aktivitaten-user-facing).
 
-**Geschichte** (`Geschichte`) `[user-facing]` — a narrative story or article published in the archive, linking `Person`s and `Document`s. Lifecycle: `DRAFT → PUBLISHED` (see `GeschichteStatus`). DRAFT stories are hidden from users without the `BLOG_WRITE` permission.
+**Geschichte** (`Geschichte`) `[user-facing]` — a narrative story or curated document journey published in the archive. Two subtypes: `STORY` (free-form prose linking `Person`s) and `JOURNEY` (a *Lesereise* — an ordered sequence of `JourneyItem`s). Lifecycle: `DRAFT → PUBLISHED` (see `GeschichteStatus`). DRAFT stories are hidden from users without the `BLOG_WRITE` permission.
+
+**JourneyItem** (`JourneyItem`, table `journey_items`) `[internal]` — a single stop in a *Lesereise* (`Geschichte` with `type=JOURNEY`). Either document-backed (`document_id IS NOT NULL`) or a note-only interlude (`note IS NOT NULL`). Ordered by `position` (gaps of 1000 leave room for drag-reorder). A CHECK constraint ensures at least one of `document_id` or `note` is present. The FK to `documents` uses `ON DELETE SET NULL`, so deleting a document preserves the item (with `document_id = null`).
+
+**Lesereise** `[user-facing]` — a curated reading journey through a sequence of family documents, optionally annotated with editorial notes. Implemented as a `Geschichte` with `type=JOURNEY`. The reader UI (follow-on issue) renders items as a sequential reading experience.
 
 **Notification** (`Notification`) — an in-app message delivered to an `AppUser`. No email or SMS delivery exists today. Delivered via Server-Sent Events (`SseEmitterRegistry`) and persisted in the `notifications` table.
 

docs/architecture/db/db-relationships.puml

@@ -66,7 +66,7 @@ package "Supporting" {
   entity audit_log
   entity geschichten
   entity geschichten_persons
-  entity geschichten_documents
+  entity journey_items
 }
 
 ' Auth relationships
@@ -129,7 +129,7 @@ audit_log }o--o| documents : document_id
 geschichten }o--o| app_users : author_id
 geschichten_persons }o--|| geschichten : geschichte_id
 geschichten_persons }o--|| persons : person_id
-geschichten_documents }o--|| geschichten : geschichte_id
+journey_items }o--|| geschichten : geschichte_id (ON DELETE CASCADE)
-geschichten_documents }o--|| documents : document_id
+journey_items }o--o| documents : document_id (ON DELETE SET NULL)
 
 @enduml