docs(db): add relationship diagram (db-relationships.puml)

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

docs/architecture/db/db-relationships.puml

@@ -0,0 +1,132 @@
+@startuml db-relationships
+' Schema source: Flyway V1–V60 (excl. V37, V43 — intentionally removed)
+' Schema as of:  V60 (2026-05-06)
+' ⚠ This is a versioned snapshot. Update when the schema changes significantly.
+
+hide circle
+skinparam linetype ortho
+
+left to right direction
+
+' ── Auth ──
+package "Auth" {
+  entity app_users
+  entity user_groups
+  entity app_users_groups
+  entity group_permissions
+  entity password_reset_tokens
+  entity invite_tokens
+  entity invite_token_group_ids
+}
+
+' ── Documents ──
+package "Documents" {
+  entity documents
+  entity document_receivers
+  entity document_tags
+  entity document_versions
+  entity document_annotations
+  entity document_comments
+  entity document_training_labels
+  entity comment_mentions
+}
+
+' ── Persons ──
+package "Persons" {
+  entity persons
+  entity person_name_aliases
+  entity person_relationships
+}
+
+' ── Tags ──
+package "Tags" {
+  entity tag
+}
+
+' ── Transcription ──
+package "Transcription" {
+  entity transcription_blocks
+  entity transcription_block_versions
+  entity transcription_block_mentioned_persons
+}
+
+' ── OCR ──
+package "OCR" {
+  entity ocr_jobs
+  entity ocr_job_documents
+  entity ocr_training_runs
+  entity sender_models
+}
+
+' ── Supporting ──
+package "Supporting" {
+  entity notifications
+  entity audit_log
+  entity geschichten
+  entity geschichten_persons
+  entity geschichten_documents
+}
+
+' Auth relationships
+app_users_groups }o--|| app_users : app_user_id
+app_users_groups }o--|| user_groups : group_id
+group_permissions }o--|| user_groups : group_id
+password_reset_tokens }o--|| app_users : app_user_id
+invite_tokens }o--|| app_users : created_by
+invite_token_group_ids }o--|| invite_tokens : invite_token_id
+invite_token_group_ids }o--|| user_groups : group_id
+
+' Document relationships
+documents }o--o| persons : sender_id
+document_receivers }o--|| documents : document_id
+document_receivers }o--|| persons : person_id
+document_tags }o--|| documents : document_id
+document_tags }o--|| tag : tag_id
+document_versions }o--|| documents : document_id
+document_versions }o--o| app_users : editor_id
+document_annotations }o--|| documents : document_id
+document_annotations }o--o| app_users : created_by
+document_comments }o--|| documents : document_id
+document_comments }o--o| document_annotations : annotation_id
+document_comments }o--o| transcription_blocks : block_id
+document_comments }o--o| app_users : author_id
+document_comments }o--o| document_comments : parent_id
+document_training_labels }o--|| documents : document_id
+comment_mentions }o--|| document_comments : comment_id
+comment_mentions }o--|| app_users : app_user_id
+
+' Person relationships
+person_name_aliases }o--|| persons : person_id
+person_relationships }o--|| persons : person_id
+person_relationships }o--|| persons : related_person_id
+
+' Tag self-reference
+tag }o--o| tag : parent_id
+
+' Transcription relationships
+transcription_blocks }o--|| document_annotations : annotation_id
+transcription_blocks }o--|| documents : document_id
+transcription_blocks }o--o| app_users : created_by
+transcription_blocks }o--o| app_users : updated_by
+transcription_block_versions }o--|| transcription_blocks : block_id
+transcription_block_versions }o--o| app_users : changed_by
+transcription_block_mentioned_persons }o--|| transcription_blocks : block_id
+
+' OCR relationships
+ocr_job_documents }o--|| ocr_jobs : job_id
+ocr_job_documents }o--|| documents : document_id
+ocr_training_runs }o--o| app_users : triggered_by
+ocr_training_runs }o--o| persons : person_id
+sender_models ||--|| persons : person_id
+
+' Supporting relationships
+notifications }o--|| app_users : recipient_id
+audit_log }o--o| app_users : actor_id
+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
+geschichten_documents }o--|| documents : document_id
+
+@enduml