V4.11 Added tags + lots of little changes to the UI

docs/schema.md

@@ -6,10 +6,11 @@ This document is the field-accurate Version 4 schema contract aligned to `src/tr
 
 - `src/transcription/db/models.py:60-78` (status and purpose enums)
 - `src/transcription/db/models.py:80-120` (`DocumentType`, `PersonRole`)
-- `src/transcription/db/models.py:122-207` (`Document`, `Person`, `DocumentPerson`)
-- `src/transcription/db/models.py:208-255` (`Job`)
-- `src/transcription/db/models.py:273-386` (`Source`, `JobSource`)
-- `src/transcription/db/models.py:387-445` (`ExecutionAttempt`)
+- `src/transcription/db/models.py:122-148` (`Tag`, `Document`)
+- `src/transcription/db/models.py:149-255` (`Person`, `DocumentPerson`, `DocumentTag`)
+- `src/transcription/db/models.py:256-303` (`Job`)
+- `src/transcription/db/models.py:304-417` (`Source`, `JobSource`)
+- `src/transcription/db/models.py:418-476` (`ExecutionAttempt`)
 
 ## Entity Relationship Overview
 
@@ -19,8 +20,10 @@ erDiagram
     Document ||--o{ Job : has
     Document ||--o{ Source : has
     Document ||--o{ DocumentPerson : links
+    Document ||--o{ DocumentTag : tagged
     Person ||--o{ DocumentPerson : links
     PersonRole ||--o{ DocumentPerson : labels
+    Tag ||--o{ DocumentTag : labels
     Job ||--o{ JobSource : includes
     Source ||--o{ JobSource : participates
     JobSource ||--o{ ExecutionAttempt : attempts
@@ -74,6 +77,18 @@ erDiagram
 | `created_at` | `datetime` | default now |
 | `updated_at` | `datetime` | default now, onupdate |
 
+### `Tag`
+
+| Field | Type | Notes |
+| :--- | :--- | :--- |
+| `id` | `UUID` | PK |
+| `semantic_key` | `str \| None` | nullable unique, indexed |
+| `label` | `str` | required |
+| `normalized_label` | `str` | unique, indexed |
+| `is_active` | `bool` | default `True` |
+| `created_at` | `datetime` | default now |
+| `updated_at` | `datetime` | default now, onupdate |
+
 ### `Document`
 
 | Field | Type | Notes |
@@ -124,6 +139,19 @@ erDiagram
 Constraint:
 - `UniqueConstraint(document_id, person_id)` named `uq_document_person`
 
+### `DocumentTag`
+
+| Field | Type | Notes |
+| :--- | :--- | :--- |
+| `id` | `UUID` | PK |
+| `document_id` | `UUID` | FK -> `document.id`, indexed |
+| `tag_id` | `UUID` | FK -> `tag.id`, indexed |
+| `created_at` | `datetime` | default now |
+| `updated_at` | `datetime` | default now, onupdate |
+
+Constraint:
+- `UniqueConstraint(document_id, tag_id)` named `uq_document_tag`
+
 ### `Job`
 
 | Field | Type | Notes |