diff --git a/frontend/public/schemas/20251121/linkml/manifest.json b/frontend/public/schemas/20251121/linkml/manifest.json
index bd07942643..fc916f8319 100644
--- a/frontend/public/schemas/20251121/linkml/manifest.json
+++ b/frontend/public/schemas/20251121/linkml/manifest.json
@@ -1,5 +1,5 @@
 {
-  "generated": "2026-01-14T19:40:08.496Z",
+  "generated": "2026-01-14T19:52:31.153Z",
   "schemaRoot": "/schemas/20251121/linkml",
   "totalFiles": 3026,
   "categoryCounts": {
diff --git a/frontend/src/pages/EntityReviewPage.css b/frontend/src/pages/EntityReviewPage.css
index 416ff0efe2..be6981183d 100644
--- a/frontend/src/pages/EntityReviewPage.css
+++ b/frontend/src/pages/EntityReviewPage.css
@@ -40,11 +40,24 @@
 }
 
 .header-actions button svg {
-  width: 20px;
-  height: 20px;
+  /* Force explicit dimensions */
+  width: 20px !important;
+  height: 20px !important;
+  min-width: 20px !important;
+  min-height: 20px !important;
+  flex-shrink: 0 !important;
+  display: block !important;
   stroke: #333 !important;
 }
 
+.header-actions button svg polygon,
+.header-actions button svg path,
+.header-actions button svg circle,
+.header-actions button svg line {
+  stroke: #333 !important;
+  stroke-width: 2px !important;
+}
+
 .dark .header-actions button svg {
   stroke: #e0e0e0 !important;
 }
diff --git a/schemas/20251121/linkml/manifest.json b/schemas/20251121/linkml/manifest.json
index fc916f8319..3db4009d63 100644
--- a/schemas/20251121/linkml/manifest.json
+++ b/schemas/20251121/linkml/manifest.json
@@ -1,5 +1,5 @@
 {
-  "generated": "2026-01-14T19:52:31.153Z",
+  "generated": "2026-01-14T21:20:44.815Z",
   "schemaRoot": "/schemas/20251121/linkml",
   "totalFiles": 3026,
   "categoryCounts": {
diff --git a/schemas/20251121/linkml/modules/classes/AccessPolicy.yaml b/schemas/20251121/linkml/modules/classes/AccessPolicy.yaml
index 19d3506077..187f675f9f 100644
--- a/schemas/20251121/linkml/modules/classes/AccessPolicy.yaml
+++ b/schemas/20251121/linkml/modules/classes/AccessPolicy.yaml
@@ -13,8 +13,10 @@ prefixes:
 default_prefix: hc
 imports:
 - linkml:types
-- ../slots/valid_from
-- ../slots/valid_to
+# Migrated per slot_fixes.yaml (Rule 53) - 2026-01-14
+# valid_from + valid_to → temporal_extent + TimeSpan (with begin_of_the_begin/end_of_the_end)
+- ../slots/temporal_extent
+- ./TimeSpan
 - ../slots/embargo_end_date
 - ../slots/contact_email
 - ../slots/policy_id
@@ -105,8 +107,7 @@ classes:
     - rights_statement_url
     - specificity_annotation
     - template_specificity
-    - valid_from
-    - valid_to
+    - temporal_extent  # was: valid_from + valid_to - migrated per Rule 53
     slot_usage:
       policy_id:
         range: uriorcurie
@@ -231,10 +232,19 @@ classes:
         examples:
         - value: access@nationaalarchief.nl
           description: Access request contact
-      valid_from:
-        range: date
-      valid_to:
-        range: date
+      temporal_extent:  # was: valid_from + valid_to - migrated per Rule 53
+        description: |
+          Validity period for this access policy using CIDOC-CRM TimeSpan.
+          MIGRATED from valid_from + valid_to per slot_fixes.yaml (Rule 53).
+          Uses begin_of_the_begin for policy start date and end_of_the_end for expiry.
+        range: TimeSpan
+        inlined: true
+        required: false
+        examples:
+        - value:
+            begin_of_the_begin: '2024-01-01'
+            end_of_the_end: '2050-12-31'
+          description: Policy valid from 2024 until end of 2050
     comments:
     - AccessPolicy defines access conditions for Collection instances
     - Used by Collection.access_policy_ref to link policies to holdings
diff --git a/schemas/20251121/linkml/modules/classes/ArticlesOfAssociation.yaml b/schemas/20251121/linkml/modules/classes/ArticlesOfAssociation.yaml
index 1f66d48ee0..c4fd21aa23 100644
--- a/schemas/20251121/linkml/modules/classes/ArticlesOfAssociation.yaml
+++ b/schemas/20251121/linkml/modules/classes/ArticlesOfAssociation.yaml
@@ -43,8 +43,7 @@ imports:
 - ../slots/requires_articles_at_registration
 - ../slots/specificity_annotation
 - ../slots/template_specificity
-- ../slots/valid_from
-- ../slots/valid_to
+- ../slots/temporal_extent  # was: valid_from + valid_to - migrated per Rule 53
 - ../slots/version_number
 - ../slots/was_derived_from
 - ../slots/was_generated_by
diff --git a/schemas/20251121/linkml/modules/classes/AuxiliaryDigitalPlatform.yaml b/schemas/20251121/linkml/modules/classes/AuxiliaryDigitalPlatform.yaml
index ae7109b526..3081b0bcb0 100644
--- a/schemas/20251121/linkml/modules/classes/AuxiliaryDigitalPlatform.yaml
+++ b/schemas/20251121/linkml/modules/classes/AuxiliaryDigitalPlatform.yaml
@@ -42,9 +42,8 @@ imports:
 - ../slots/related_project
 - ../slots/specificity_annotation
 - ../slots/template_specificity
-- ../slots/temporal_extent
-- ../slots/valid_from
-- ../slots/valid_to
+- ../slots/temporal_extent  # consolidated: absorbs valid_from + valid_to per Rule 53
+# REMOVED 2026-01-14: valid_from + valid_to - migrated to temporal_extent (Rule 53)
 - ../slots/was_derived_from
 - ../slots/was_generated_by
 - ./SpecificityAnnotation
diff --git a/schemas/20251121/linkml/modules/classes/AuxiliaryPlace.yaml b/schemas/20251121/linkml/modules/classes/AuxiliaryPlace.yaml
index 43d4cd49d4..1ad95ae2b7 100644
--- a/schemas/20251121/linkml/modules/classes/AuxiliaryPlace.yaml
+++ b/schemas/20251121/linkml/modules/classes/AuxiliaryPlace.yaml
@@ -52,9 +52,8 @@ imports:
 - ../slots/specificity_annotation
 - ../slots/subregion
 - ../slots/template_specificity
-- ../slots/temporal_extent
-- ../slots/valid_from
-- ../slots/valid_to
+- ../slots/temporal_extent  # consolidated: absorbs valid_from + valid_to per Rule 53
+# REMOVED 2026-01-14: valid_from + valid_to - migrated to temporal_extent (Rule 53)
 - ../slots/was_derived_from
 - ../slots/was_generated_by
 - ./SpecificityAnnotation
diff --git a/schemas/20251121/linkml/modules/classes/AvailabilityStatus.yaml b/schemas/20251121/linkml/modules/classes/AvailabilityStatus.yaml
index 4a007d8834..7ade8db731 100644
--- a/schemas/20251121/linkml/modules/classes/AvailabilityStatus.yaml
+++ b/schemas/20251121/linkml/modules/classes/AvailabilityStatus.yaml
@@ -5,8 +5,8 @@ imports:
 - linkml:types
 - ../slots/has_or_had_label
 - ../slots/has_or_had_description
-- ../slots/valid_from
-- ../slots/valid_to
+- ../slots/temporal_extent  # was: valid_from + valid_to - migrated per Rule 53
+- ./TimeSpan
 prefixes:
   linkml: https://w3id.org/linkml/
   hc: https://nde.nl/ontology/hc/
diff --git a/schemas/20251121/linkml/modules/classes/Budget.yaml b/schemas/20251121/linkml/modules/classes/Budget.yaml
index 712a94ddc2..f35d96503f 100644
--- a/schemas/20251121/linkml/modules/classes/Budget.yaml
+++ b/schemas/20251121/linkml/modules/classes/Budget.yaml
@@ -44,8 +44,10 @@ imports:
 - ../slots/specificity_annotation
 - ../slots/template_specificity
 - ../slots/total_budget_amount
-- ../slots/valid_from
-- ../slots/valid_to
+# Migrated per slot_fixes.yaml (Rule 53) - 2026-01-14
+# valid_from + valid_to → temporal_extent + TimeSpan (with begin_of_the_begin/end_of_the_end)
+- ../slots/temporal_extent
+# TimeSpan already imported above (line 9)
 - ../slots/was_derived_from
 - ../slots/was_generated_by
 - ./SpecificityAnnotation
@@ -129,8 +131,9 @@ classes:
     - specificity_annotation
     - template_specificity
     - total_budget_amount
-    - valid_from
-    - valid_to
+    # Migrated per slot_fixes.yaml (Rule 53) - 2026-01-14
+    # valid_from + valid_to → temporal_extent.begin_of_the_begin / temporal_extent.end_of_the_end
+    - temporal_extent  # was: valid_from + valid_to
     - was_derived_from
     - was_generated_by
     slot_usage:
@@ -324,12 +327,31 @@ classes:
       was_generated_by:
         range: ReconstructionActivity
         required: false
-      valid_from:
-        range: date
-        required: false
-      valid_to:
-        range: date
+      temporal_extent:  # was: valid_from + valid_to
+        description: |
+          Validity period for this budget using CIDOC-CRM TimeSpan.
+          MIGRATED from valid_from + valid_to per slot_fixes.yaml (Rule 53).
+          
+          Use begin_of_the_begin for budget effective date (was valid_from).
+          Use end_of_the_end for budget expiration date (was valid_to).
+          
+          For precise dates, set begin_of_the_begin == end_of_the_begin.
+        range: TimeSpan
+        inlined: true
         required: false
+        examples:
+        - value:
+            begin_of_the_begin: '2024-01-01'
+            end_of_the_begin: '2024-01-01'
+            begin_of_the_end: '2024-12-31'
+            end_of_the_end: '2024-12-31'
+          description: Calendar year budget with precise start/end
+        - value:
+            begin_of_the_begin: '2024-04-01'
+            end_of_the_begin: '2024-04-01'
+            begin_of_the_end: '2025-03-31'
+            end_of_the_end: '2025-03-31'
+          description: Government fiscal year budget (Apr-Mar)
     comments:
     - Represents PLANNED financial allocations (not actuals)
     - 'Heritage-specific categories: acquisition, preservation, digitization budgets'
diff --git a/schemas/20251121/linkml/modules/classes/CollectionManagementSystem.yaml b/schemas/20251121/linkml/modules/classes/CollectionManagementSystem.yaml
index f644c5bc27..1da69ddde7 100644
--- a/schemas/20251121/linkml/modules/classes/CollectionManagementSystem.yaml
+++ b/schemas/20251121/linkml/modules/classes/CollectionManagementSystem.yaml
@@ -32,8 +32,13 @@ imports:
 - ../slots/template_specificity
 - ../slots/temporal_extent
 - ../slots/used_by_custodian
-- ../slots/vendor_name
-- ../slots/vendor_url
+# Migrated per slot_fixes.yaml (Rule 53) - 2026-01-14
+# vendor_name → has_or_had_label + Label
+# vendor_url → has_or_had_url + URL (URL already imported above)
+- ../slots/has_or_had_label
+- ../slots/has_or_had_url
+- ./Label
+- ./URL
 - ../slots/was_derived_from
 - ../slots/was_generated_by
 - ./SpecificityAnnotation
@@ -85,8 +90,7 @@ classes:
       \ → CollectionManagementSystem\n\n4. **CMS Detection**: \"Does this website have a detectable CMS backend?\"\n   - Check:\
       \ DigitalPlatform.cms_detected flag\n\n**Example**:\n```yaml\nCollectionManagementSystem:\n  cms_id: \"https://nde.nl/ontology/hc/cms/collective-access-rm\"\
       \n  cms_product_name: \"CollectiveAccess\"\n  cms_product_version: \"1.8.0\"\n  cms_category: MUSEUM_CMS\n  open_source:\
-      \ true\n  license: \"GPL-3.0\"\n  vendor_name: \"Whirl-i-Gig\"\n  powers_platform:\n    - \"https://nde.nl/ontology/hc/platform/some-museum\"\
-      \n  manages_collection:\n    - \"https://nde.nl/ontology/hc/collection/some-collection\"\n```\n"
+      \ true\\n  license: \\\"GPL-3.0\\\"\\n  has_or_had_label: \\\"Whirl-i-Gig\\\"  # vendor_name\\n  powers_platform:\\n    - \\\"https://nde.nl/ontology/hc/platform/some-museum\\\"\\\n      \n  manages_collection:\n    - \"https://nde.nl/ontology/hc/collection/some-collection\"\n```\n"
     exact_mappings:
     - schema:SoftwareApplication
     close_mappings:
@@ -122,8 +126,9 @@ classes:
     - template_specificity
     - temporal_extent
     - used_by_custodian
-    - vendor_name
-    - vendor_url
+    # Migrated per slot_fixes.yaml (Rule 53) - 2026-01-14
+    - has_or_had_label  # was: vendor_name
+    - has_or_had_url    # was: vendor_url
     - was_derived_from
     - was_generated_by
     slot_usage:
@@ -172,19 +177,32 @@ classes:
           description: GNU GPL v3 license
         - value: Proprietary
           description: Commercial license
-      vendor_name:
+      has_or_had_label:  # was: vendor_name
+        description: |
+          Name of the CMS vendor/developer.
+          MIGRATED from vendor_name per slot_fixes.yaml (Rule 53).
         range: string
+        multivalued: false
         examples:
         - value: Whirl-i-Gig
           description: CollectiveAccess developer
         - value: Zetcom AG
           description: MuseumPlus developer
-      vendor_url:
-        range: uri
+      has_or_had_url:  # was: vendor_url
+        description: |
+          Website URL of the CMS vendor/developer.
+          MIGRATED from vendor_url per slot_fixes.yaml (Rule 53).
+        range: URL
+        inlined: true
+        multivalued: true
         examples:
-        - value: https://www.collectiveaccess.org/
+        - value:
+            url_value: https://www.collectiveaccess.org/
+            url_type: vendor
           description: CollectiveAccess website
-        - value: https://www.zetcom.com/
+        - value:
+            url_value: https://www.zetcom.com/
+            url_type: vendor
           description: Zetcom website
       documentation_url:
         range: uri
@@ -290,6 +308,7 @@ classes:
     - http://www.cidoc-crm.org/cidoc-crm/E29_Design_or_Procedure
     - http://usefulinc.com/ns/doap#Project
     examples:
+    # Examples updated for migrated slots (Rule 53) - 2026-01-14
     - value:
         cms_id: https://nde.nl/ontology/hc/cms/rijksmuseum-adlib
         cms_product_name: Adlib
@@ -297,8 +316,10 @@ classes:
         cms_category: MUSEUM_CMS
         open_source: false
         license: Proprietary
-        vendor_name: Axiell
-        vendor_url: https://www.axiell.com/
+        has_or_had_label: Axiell  # was: vendor_name
+        has_or_had_url:  # was: vendor_url
+          url_value: https://www.axiell.com/
+          url_type: vendor
         supported_metadata_standard:
         - SPECTRUM
         - Dublin Core
@@ -320,8 +341,10 @@ classes:
         cms_category: MUSEUM_CMS
         open_source: true
         license: GPL-3.0
-        vendor_name: Whirl-i-Gig
-        vendor_url: https://www.collectiveaccess.org/
+        has_or_had_label: Whirl-i-Gig  # was: vendor_name
+        has_or_had_url:  # was: vendor_url
+          url_value: https://www.collectiveaccess.org/
+          url_type: vendor
         documentation_url: https://manual.collectiveaccess.org/
         programming_language:
         - PHP
@@ -344,7 +367,7 @@ classes:
         cms_category: ARCHIVE_CMS
         open_source: false
         license: Proprietary
-        vendor_name: De Ree Archiefsystemen
+        has_or_had_label: De Ree Archiefsystemen  # was: vendor_name
         supported_metadata_standard:
         - ISAD(G)
         - EAD
diff --git a/schemas/20251121/linkml/modules/classes/ExhibitionCatalog.yaml b/schemas/20251121/linkml/modules/classes/ExhibitionCatalog.yaml
index 7a1865d5f3..9937e3f509 100644
--- a/schemas/20251121/linkml/modules/classes/ExhibitionCatalog.yaml
+++ b/schemas/20251121/linkml/modules/classes/ExhibitionCatalog.yaml
@@ -51,7 +51,10 @@ imports:
 - ../slots/specificity_annotation
 - ../slots/table_of_content
 - ../slots/template_specificity
-- ../slots/worldcat_id
+# REMOVED - migrated to has_or_had_identifier with WorldCatIdentifier (2026-01-14, Rule 53)
+# - ../slots/worldcat_id
+- ../slots/has_or_had_identifier
+- ./WorldCatIdentifier
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
 # REMOVED: ../slots/has_author - migrated to has_or_had_author (Rule 53)
@@ -117,7 +120,8 @@ classes:
     - table_of_content
     - template_specificity
     - wikidata_id
-    - worldcat_id
+    # REMOVED: worldcat_id - migrated to has_or_had_identifier with WorldCatIdentifier (2026-01-14, Rule 53)
+    - has_or_had_identifier
     slot_usage:
       catalog_id:
         identifier: true
diff --git a/schemas/20251121/linkml/modules/classes/StorageUnit.yaml b/schemas/20251121/linkml/modules/classes/StorageUnit.yaml
index bd093576a8..581ca5bef1 100644
--- a/schemas/20251121/linkml/modules/classes/StorageUnit.yaml
+++ b/schemas/20251121/linkml/modules/classes/StorageUnit.yaml
@@ -21,9 +21,13 @@ imports:
 # - ../slots/bay_number
 # REMOVED - migrated to has_or_had_identifier with range BoxNumber (Rule 53)
 # - ../slots/box_number
+# REMOVED - migrated to has_or_had_identifier (2026-01-14, Rule 53)
+# - ../slots/unit_id
+# - ../slots/unit_identifier
 - ../slots/has_or_had_identifier
 - ./BayNumber
 - ./BoxNumber
+- ./UnitIdentifier  # Added for unit_id/unit_identifier migration (2026-01-14)
 - ../slots/current_item_count
 - ../slots/drawer_number
 - ../slots/part_of_storage
@@ -34,8 +38,9 @@ imports:
 - ../slots/stores_object
 - ../slots/template_specificity
 - ../slots/unit_description
-- ../slots/unit_id
-- ../slots/unit_identifier
+# REMOVED - migrated to has_or_had_identifier (2026-01-14, Rule 53)
+# - ../slots/unit_id
+# - ../slots/unit_identifier
 - ../slots/valid_from
 - ../slots/valid_to
 - ./EnvironmentalZone
@@ -95,26 +100,28 @@ classes:
     - stores_object
     - template_specificity
     - unit_description
-    - unit_id
-    - unit_identifier
+    # REMOVED - migrated to has_or_had_identifier (2026-01-14, Rule 53)
+    # - unit_id
+    # - unit_identifier
     - unit_name
     - unit_type
     - valid_from
     - valid_to
     slot_usage:
-      unit_id:
-        range: uriorcurie
-        required: true
-        identifier: true
-        examples:
-        - value: https://nde.nl/ontology/hc/unit/na-depot-a-r12-b3-s4
-          description: National Archives Depot A, Row 12, Bay 3, Shelf 4
-      unit_identifier:
-        range: string
-        examples:
-        - value: BOX-2024-00145
-        - value: FF-MAPS-042
-        - value: RACK-TEXT-A12
+      # MIGRATED from unit_id and unit_identifier (2026-01-14, Rule 53)
+      # unit_id:
+      #   range: uriorcurie
+      #   required: true
+      #   identifier: true
+      #   examples:
+      #   - value: https://nde.nl/ontology/hc/unit/na-depot-a-r12-b3-s4
+      #     description: National Archives Depot A, Row 12, Bay 3, Shelf 4
+      # unit_identifier:
+      #   range: string
+      #   examples:
+      #   - value: BOX-2024-00145
+      #   - value: FF-MAPS-042
+      #   - value: RACK-TEXT-A12
       unit_name:
         range: string
         examples:
@@ -133,14 +140,21 @@ classes:
         - value: North-3
       has_or_had_identifier:
         description: |
-          MIGRATED from bay_number and box_number (Rule 53).
-          Storage location identifiers including bay and box numbers.
-          Use BayNumber for bay/section identifiers, BoxNumber for box positions.
-        range: string
+          Storage unit identifiers including unit IDs, bay numbers, and box numbers.
+          MIGRATED from bay_number, box_number, unit_id, unit_identifier (Rule 53).
+          Use UnitIdentifier for storage unit identifiers, BayNumber for bay/section 
+          identifiers, BoxNumber for box positions.
+        range: uriorcurie
         multivalued: true
+        required: true
+        identifier: true
         examples:
-        - value: '[{type: BayNumber, value: "3"}, {type: BoxNumber, value: 12}]'
-          description: Bay 3, Box 12
+        - value: 'https://nde.nl/ontology/hc/unit/na-depot-a-r12-b3-s4'
+          description: Storage unit URI identifier
+        - value: '{"type": "UnitIdentifier", "value": "BOX-2024-00145"}'
+          description: Local box identifier
+        - value: '{"type": "BayNumber", "value": "3"}'
+          description: Bay 3 identifier
       # DEPRECATED - use has_or_had_identifier with range BayNumber
       # bay_number:
       #   range: string
diff --git a/schemas/20251121/linkml/modules/classes/UnitIdentifier.yaml b/schemas/20251121/linkml/modules/classes/UnitIdentifier.yaml
new file mode 100644
index 0000000000..b5d0b0bc80
--- /dev/null
+++ b/schemas/20251121/linkml/modules/classes/UnitIdentifier.yaml
@@ -0,0 +1,72 @@
+# UnitIdentifier - Storage unit identifier class
+# Created: 2026-01-14 for unit_id/unit_identifier migration (Rule 53)
+# 
+# This class replaces the unit_id and unit_identifier slots
+# with a proper Identifier subclass for storage units.
+
+id: https://nde.nl/ontology/hc/class/UnitIdentifier
+name: UnitIdentifier
+title: Storage Unit Identifier
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  dcterms: http://purl.org/dc/terms/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../slots/has_or_had_code
+  - ../slots/identifier_scheme
+
+classes:
+  UnitIdentifier:
+    class_uri: hc:UnitIdentifier
+    description: |
+      Identifier for storage units within heritage institutions.
+      
+      **DEFINITION**:
+      
+      UnitIdentifier represents unique identifiers assigned to individual
+      storage compartments, shelves, cabinets, or other discrete units.
+      
+      **REPLACED SLOTS**:
+      - unit_id: URI identifier for the storage unit
+      - unit_identifier: Local string identifier (barcode, label)
+      
+      **IDENTIFIER FORMATS**:
+      | Format | Example | Use Case |
+      |--------|---------|----------|
+      | URI | https://nde.nl/ontology/hc/unit/na-depot-a-r12-b3-s4 | Persistent web ID |
+      | Barcode | BOX-2024-00145 | Physical box barcode |
+      | Label | FF-MAPS-042 | Flat file drawer label |
+      | Rack | RACK-TEXT-A12 | Storage rack identifier |
+      
+    slots:
+      - has_or_had_code
+      - identifier_scheme
+    
+    slot_usage:
+      has_or_had_code:
+        range: string
+        required: true
+        description: The identifier value
+        examples:
+          - value: BOX-2024-00145
+            description: Archive box barcode
+          - value: FF-MAPS-042
+            description: Flat file drawer label
+      identifier_scheme:
+        range: string
+        description: The identifier scheme (URI, Barcode, Label, etc.)
+        examples:
+          - value: barcode
+          - value: label
+          - value: uri
+    
+    annotations:
+      migration_date: "2026-01-14"
+      replaces_slots: "unit_id, unit_identifier"
+      rule_compliance: "53 (full slot migration)"
diff --git a/schemas/20251121/linkml/modules/classes/VideoAnnotationTypes.yaml b/schemas/20251121/linkml/modules/classes/VideoAnnotationTypes.yaml
index b14549d335..5bba5701dc 100644
--- a/schemas/20251121/linkml/modules/classes/VideoAnnotationTypes.yaml
+++ b/schemas/20251121/linkml/modules/classes/VideoAnnotationTypes.yaml
@@ -61,7 +61,7 @@ imports:
 - ../slots/has_or_had_text_segment
 - ../slots/text_types_detected
 - ../slots/total_characters_extracted
-- ../slots/tracking_ids_assigned
+# Removed: ../slots/tracking_ids_assigned - MIGRATED to has_or_had_quantity (2026-01-14)
 - ../slots/transition_types_detected
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
@@ -306,7 +306,7 @@ classes:
     - object_classes_detected
     - specificity_annotation
     - template_specificity
-    - tracking_ids_assigned
+    # Removed: tracking_ids_assigned - MIGRATED to has_or_had_quantity (2026-01-14)
     slot_usage:
       has_or_had_detected_object:
         range: DetectedObject
@@ -381,13 +381,9 @@ classes:
         examples:
         - value: true
           description: Objects tracked across frames
-      tracking_ids_assigned:
-        range: integer
-        required: false
-        minimum_value: 0
-        examples:
-        - value: 23
-          description: 23 unique tracking IDs assigned
+      # MIGRATED from tracking_ids_assigned (2026-01-14)
+      # tracking_ids_assigned count now represented through has_or_had_quantity
+      # with Quantity class containing quantity_type: TRACKING_ID_COUNT
       linked_to_collection:
         range: boolean
         required: false
diff --git a/schemas/20251121/linkml/modules/classes/VideoChapterList.yaml b/schemas/20251121/linkml/modules/classes/VideoChapterList.yaml
index 11b956872c..5b4c295e7c 100644
--- a/schemas/20251121/linkml/modules/classes/VideoChapterList.yaml
+++ b/schemas/20251121/linkml/modules/classes/VideoChapterList.yaml
@@ -9,7 +9,10 @@ imports:
 - ../slots/template_specificity
 - ./TemplateSpecificityScores
 - ../enums/ChapterSourceEnum
-- ../slots/video_id
+# REMOVED - migrated to has_or_had_identifier with VideoIdentifier (2026-01-14, Rule 53)
+# - ../slots/video_id
+- ../slots/has_or_had_identifier
+- ./VideoIdentifier
 - ../slots/has_or_had_chapter
 - ../slots/total_chapter
 - ../slots/chapters_source
@@ -49,11 +52,22 @@ classes:
     - specificity_annotation
     - template_specificity
     - total_chapter
-    - video_id
+    # REMOVED - migrated to has_or_had_identifier (2026-01-14, Rule 53)
+    # - video_id
+    - has_or_had_identifier
     slot_usage:
-      video_id:
-        range: string
+      # MIGRATED from video_id (2026-01-14, Rule 53)
+      # video_id:
+      #   range: string
+      #   required: true
+      has_or_had_identifier:
+        description: Reference to the parent video
+        range: VideoIdentifier
         required: true
+        inlined: true
+        examples:
+        - value: '{"has_or_had_code": "dQw4w9WgXcQ", "platform": "YouTube"}'
+          description: YouTube video identifier
       has_or_had_chapter:
         range: VideoChapter
         multivalued: true
diff --git a/schemas/20251121/linkml/modules/classes/VideoPost.yaml b/schemas/20251121/linkml/modules/classes/VideoPost.yaml
index 9446f79ab5..0290e0fdb6 100644
--- a/schemas/20251121/linkml/modules/classes/VideoPost.yaml
+++ b/schemas/20251121/linkml/modules/classes/VideoPost.yaml
@@ -34,7 +34,10 @@ imports:
 - ../slots/metrics_observed_at
 - ../slots/specificity_annotation
 - ../slots/template_specificity
-- ../slots/video_category_id
+# REMOVED - migrated to has_or_had_identifier with VideoCategoryIdentifier (2026-01-14, Rule 53)
+# - ../slots/video_category_id
+- ../slots/has_or_had_identifier
+- ./VideoCategoryIdentifier
 - ../slots/video_comment
 - ../slots/has_or_had_quantity
 - ./Quantity
@@ -214,7 +217,9 @@ classes:
     - metrics_observed_at
     - specificity_annotation
     - template_specificity
-    - video_category_id
+    # REMOVED - migrated to has_or_had_identifier (2026-01-14, Rule 53)
+    # - video_category_id
+    - has_or_had_identifier
     - video_comment
     - has_or_had_quantity
     slot_usage:
@@ -319,14 +324,24 @@ classes:
         examples:
         - value: '2025-12-01T23:16:22.294232+00:00'
           description: Metrics observed December 1, 2025
-      video_category_id:
-        range: string
+      # MIGRATED from video_category_id (2026-01-14, Rule 53)
+      # video_category_id:
+      #   range: string
+      #   required: false
+      #   examples:
+      #   - value: '22'
+      #     description: 'YouTube: People & Blogs'
+      #   - value: '27'
+      #     description: 'YouTube: Education'
+      has_or_had_identifier:
+        description: Video category identifier (migrated from video_category_id)
+        range: VideoCategoryIdentifier
+        multivalued: true
         required: false
+        inlined: true
         examples:
-        - value: '22'
-          description: 'YouTube: People & Blogs'
-        - value: '27'
-          description: 'YouTube: Education'
+        - value: '{"has_or_had_code": "27", "category_name": "Education", "platform": "YouTube"}'
+          description: 'YouTube: Education category'
       live_broadcast_content:
         range: LiveBroadcastStatusEnum
         required: false
diff --git a/schemas/20251121/linkml/modules/classes/VideoSubtitle.yaml b/schemas/20251121/linkml/modules/classes/VideoSubtitle.yaml
index da273b768f..9c28bddd90 100644
--- a/schemas/20251121/linkml/modules/classes/VideoSubtitle.yaml
+++ b/schemas/20251121/linkml/modules/classes/VideoSubtitle.yaml
@@ -18,7 +18,8 @@ imports:
 - ../slots/specificity_annotation
 - ../slots/subtitle_format
 - ../slots/template_specificity
-- ../slots/track_id
+- ../slots/has_or_had_identifier  # MIGRATED: was ../slots/track_id (2026-01-14)
+- ./TrackIdentifier  # Added for has_or_had_identifier migration
 - ../slots/track_name
 - ./SpecificityAnnotation
 - ./TemplateSpecificityScores
@@ -240,7 +241,7 @@ classes:
     - specificity_annotation
     - subtitle_format
     - template_specificity
-    - track_id
+    - has_or_had_identifier  # MIGRATED: was track_id (2026-01-14)
     - track_name
     slot_usage:
       has_or_had_segment:
@@ -318,11 +319,21 @@ classes:
         - value: English (auto-generated)
           description: YouTube auto-caption track name
       track_id:
+        description: Platform-specific identifier for this subtitle track (DEPRECATED - use has_or_had_identifier)
         range: string
+        deprecated: "Use has_or_had_identifier with TrackIdentifier range instead"
         required: false
         examples:
         - value: en.3OWxR1w4QfE
           description: YouTube caption track ID
+      has_or_had_identifier:  # MIGRATED from track_id (2026-01-14)
+        description: Platform-specific identifier for this subtitle track
+        range: TrackIdentifier
+        required: false
+        inlined: true
+        examples:
+        - value: '{"platform": "YouTube", "has_or_had_code": "en.3OWxR1w4QfE"}'
+          description: YouTube caption track identifier
       default_position:
         range: SubtitlePositionEnum
         required: false
diff --git a/schemas/20251121/linkml/modules/classes/Warehouse.yaml b/schemas/20251121/linkml/modules/classes/Warehouse.yaml
index cf54e431c5..975ba372a4 100644
--- a/schemas/20251121/linkml/modules/classes/Warehouse.yaml
+++ b/schemas/20251121/linkml/modules/classes/Warehouse.yaml
@@ -14,12 +14,23 @@ imports:
 - ../slots/has_loading_dock
 - ../slots/specificity_annotation
 - ../slots/template_specificity
-- ../slots/warehouse_description
-- ../slots/warehouse_floor_area_sqm
-- ../slots/warehouse_id
-- ../slots/warehouse_managed_by
-- ../slots/warehouse_name
-- ../slots/warehouse_security_level
+# Migrated per slot_fixes.yaml (Rule 53) - 2026-01-14
+# warehouse_description → has_or_had_description + Description
+# warehouse_floor_area_sqm → has_or_had_area + Area
+# warehouse_id → has_or_had_identifier (uriorcurie range)
+# warehouse_managed_by → is_or_was_managed_by + Group
+# warehouse_name → has_or_had_label
+# warehouse_security_level → has_or_had_security_level + SecurityLevel
+- ../slots/has_or_had_description
+- ../slots/has_or_had_area
+- ../slots/has_or_had_identifier
+- ../slots/is_or_was_managed_by
+- ../slots/has_or_had_label
+- ../slots/has_or_had_security_level
+- ./Description
+- ./Area
+- ./Group
+- ./SecurityLevel
 - ../slots/has_or_had_type
 - ../slots/was_derived_from
 - ../slots/was_generated_by
@@ -80,35 +91,49 @@ classes:
     - has_loading_dock
     - specificity_annotation
     - template_specificity
-    - warehouse_description
-    - warehouse_floor_area_sqm
-    - warehouse_id
-    - warehouse_managed_by
-    - warehouse_name
-    - warehouse_security_level
+    # Migrated per slot_fixes.yaml (Rule 53) - 2026-01-14
+    - has_or_had_description   # was: warehouse_description
+    - has_or_had_area          # was: warehouse_floor_area_sqm
+    - has_or_had_identifier    # was: warehouse_id
+    - is_or_was_managed_by     # was: warehouse_managed_by
+    - has_or_had_label         # was: warehouse_name
+    - has_or_had_security_level  # was: warehouse_security_level
     - has_or_had_type
     - was_derived_from
     - was_generated_by
     slot_usage:
-      warehouse_id:
+      has_or_had_identifier:  # was: warehouse_id
+        description: |
+          Unique identifier for this warehouse.
+          MIGRATED from warehouse_id per slot_fixes.yaml (Rule 53).
         range: uriorcurie
         required: true
         identifier: true
         examples:
         - value: https://nde.nl/ontology/hc/aux/rm-logistics-warehouse
           description: Rijksmuseum logistics warehouse
-      warehouse_name:
+      has_or_had_label:  # was: warehouse_name
+        description: |
+          Human-readable name of this warehouse.
+          MIGRATED from warehouse_name per slot_fixes.yaml (Rule 53).
         range: string
         required: true
+        multivalued: false
         examples:
         - value: Rijksmuseum Logistics Warehouse
           description: Museum logistics facility
         - value: KB Operations Warehouse Leiden
           description: Library operations warehouse
-      warehouse_description:
-        range: string
+      has_or_had_description:  # was: warehouse_description
+        description: |
+          Description of warehouse purpose and contents.
+          MIGRATED from warehouse_description per slot_fixes.yaml (Rule 53).
+        range: Description
+        inlined: true
         examples:
-        - value: Logistics warehouse for exhibition equipment, packing materials, and furniture. Facilities team access only.
+        - value:
+            description_text: Logistics warehouse for exhibition equipment, packing materials, and furniture. Facilities team access only.
+            description_type: warehouse
           description: Exhibition logistics warehouse
       has_or_had_type:
         range: WarehouseType
@@ -126,10 +151,19 @@ classes:
         examples:
         - value: Exhibition cases, lighting rigs, pedestals, crates, packing foam
           description: Exhibition equipment contents
-      warehouse_floor_area_sqm:
-        range: float
+      has_or_had_area:  # was: warehouse_floor_area_sqm
+        description: |
+          Floor area of this warehouse.
+          MIGRATED from warehouse_floor_area_sqm per slot_fixes.yaml (Rule 53).
+        range: Area
+        inlined: true
         examples:
-        - value: 500.0
+        - value:
+            area_value: 500.0
+            has_or_had_unit:
+              unit_type: SQUARE_METER
+              unit_symbol: "m²"
+            has_or_had_label: "Warehouse floor area"
           description: 500 m² warehouse
       has_loading_dock:
         range: boolean
@@ -155,10 +189,16 @@ classes:
           description: Heating only
         - value: HVAC
           description: Full HVAC
-      warehouse_security_level:
-        range: string
+      has_or_had_security_level:  # was: warehouse_security_level
+        description: |
+          Security level of this warehouse.
+          MIGRATED from warehouse_security_level per slot_fixes.yaml (Rule 53).
+        range: SecurityLevel
+        inlined: true
         examples:
-        - value: STANDARD
+        - value:
+            has_or_had_code: "STANDARD"
+            level_name: "Standard Security"
           description: Standard security
       has_or_had_access_restriction:
         range: string
@@ -167,12 +207,18 @@ classes:
           description: Staff restriction
         - value: Operations team badge required
           description: Badge access
-      warehouse_managed_by:
-        range: string
+      is_or_was_managed_by:  # was: warehouse_managed_by
+        description: |
+          Group or team that manages this warehouse.
+          MIGRATED from warehouse_managed_by per slot_fixes.yaml (Rule 53).
+        range: Group
+        inlined: true
         examples:
-        - value: Facilities Management
+        - value:
+            group_name: "Facilities Management"
           description: Facilities team
-        - value: Exhibition Services
+        - value:
+            group_name: "Exhibition Services"
           description: Exhibition team
       was_derived_from:
         range: CustodianObservation
@@ -191,32 +237,50 @@ classes:
     - http://vocab.getty.edu/aat/300007775
     - https://schema.org/Warehouse
     examples:
+    # Examples updated for migrated slots (Rule 53) - 2026-01-14
     - value:
-        warehouse_id: https://nde.nl/ontology/hc/aux/rm-logistics-warehouse
-        warehouse_name: Rijksmuseum Logistics Warehouse
-        warehouse_description: Logistics warehouse for exhibition equipment and packing materials. Used by exhibition services
-          team.
+        has_or_had_identifier: https://nde.nl/ontology/hc/aux/rm-logistics-warehouse  # was: warehouse_id
+        has_or_had_label: Rijksmuseum Logistics Warehouse  # was: warehouse_name
+        has_or_had_description:  # was: warehouse_description
+          description_text: Logistics warehouse for exhibition equipment and packing materials. Used by exhibition services team.
+          description_type: warehouse
         has_or_had_type: EXHIBITION_EQUIPMENT
         contents_description: Exhibition cases, lighting rigs, pedestals, crates, packing foam, display furniture
-        warehouse_floor_area_sqm: 800.0
+        has_or_had_area:  # was: warehouse_floor_area_sqm
+          area_value: 800.0
+          has_or_had_unit:
+            unit_type: SQUARE_METER
+            unit_symbol: "m²"
         has_loading_dock: true
         has_forklift_access: true
         has_climate_control: true
         climate_control_type: HEATED
-        warehouse_security_level: STANDARD
-        access_restriction: Exhibition Services and Facilities staff
-        warehouse_managed_by: Exhibition Services
+        has_or_had_security_level:  # was: warehouse_security_level
+          has_or_had_code: "STANDARD"
+          level_name: "Standard Security"
+        has_or_had_access_restriction: Exhibition Services and Facilities staff
+        is_or_was_managed_by:  # was: warehouse_managed_by
+          group_name: "Exhibition Services"
       description: Museum logistics warehouse
     - value:
-        warehouse_id: https://nde.nl/ontology/hc/aux/na-supplies-warehouse
-        warehouse_name: Nationaal Archief Supplies Warehouse
-        warehouse_description: General supplies warehouse for archival boxes, office furniture, and operational materials.
+        has_or_had_identifier: https://nde.nl/ontology/hc/aux/na-supplies-warehouse  # was: warehouse_id
+        has_or_had_label: Nationaal Archief Supplies Warehouse  # was: warehouse_name
+        has_or_had_description:  # was: warehouse_description
+          description_text: General supplies warehouse for archival boxes, office furniture, and operational materials.
+          description_type: warehouse
         has_or_had_type: GENERAL_SUPPLIES
         contents_description: Empty archival boxes, office furniture, cleaning supplies, signage
-        warehouse_floor_area_sqm: 300.0
+        has_or_had_area:  # was: warehouse_floor_area_sqm
+          area_value: 300.0
+          has_or_had_unit:
+            unit_type: SQUARE_METER
+            unit_symbol: "m²"
         has_loading_dock: true
         has_forklift_access: false
         has_climate_control: false
-        warehouse_security_level: BASIC
-        warehouse_managed_by: Facilities Management
+        has_or_had_security_level:  # was: warehouse_security_level
+          has_or_had_code: "BASIC"
+          level_name: "Basic Security"
+        is_or_was_managed_by:  # was: warehouse_managed_by
+          group_name: "Facilities Management"
       description: Archive supplies warehouse
diff --git a/schemas/20251121/linkml/modules/slots/track_id.yaml b/schemas/20251121/linkml/modules/slots/archive/track_id_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/track_id.yaml
rename to schemas/20251121/linkml/modules/slots/archive/track_id_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/tracking_ids_assigned.yaml b/schemas/20251121/linkml/modules/slots/archive/tracking_ids_assigned_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/tracking_ids_assigned.yaml
rename to schemas/20251121/linkml/modules/slots/archive/tracking_ids_assigned_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/unit_id.yaml b/schemas/20251121/linkml/modules/slots/archive/unit_id_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/unit_id.yaml
rename to schemas/20251121/linkml/modules/slots/archive/unit_id_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/unit_identifier.yaml b/schemas/20251121/linkml/modules/slots/archive/unit_identifier_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/unit_identifier.yaml
rename to schemas/20251121/linkml/modules/slots/archive/unit_identifier_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/vendor_name.yaml b/schemas/20251121/linkml/modules/slots/archive/vendor_name_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/vendor_name.yaml
rename to schemas/20251121/linkml/modules/slots/archive/vendor_name_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/vendor_url.yaml b/schemas/20251121/linkml/modules/slots/archive/vendor_url_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/vendor_url.yaml
rename to schemas/20251121/linkml/modules/slots/archive/vendor_url_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/video_category_id.yaml b/schemas/20251121/linkml/modules/slots/archive/video_category_id_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/video_category_id.yaml
rename to schemas/20251121/linkml/modules/slots/archive/video_category_id_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/video_id.yaml b/schemas/20251121/linkml/modules/slots/archive/video_id_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/video_id.yaml
rename to schemas/20251121/linkml/modules/slots/archive/video_id_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/warehouse_description.yaml b/schemas/20251121/linkml/modules/slots/archive/warehouse_description_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/warehouse_description.yaml
rename to schemas/20251121/linkml/modules/slots/archive/warehouse_description_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/warehouse_floor_area_sqm.yaml b/schemas/20251121/linkml/modules/slots/archive/warehouse_floor_area_sqm_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/warehouse_floor_area_sqm.yaml
rename to schemas/20251121/linkml/modules/slots/archive/warehouse_floor_area_sqm_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/warehouse_id.yaml b/schemas/20251121/linkml/modules/slots/archive/warehouse_id_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/warehouse_id.yaml
rename to schemas/20251121/linkml/modules/slots/archive/warehouse_id_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/warehouse_managed_by.yaml b/schemas/20251121/linkml/modules/slots/archive/warehouse_managed_by_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/warehouse_managed_by.yaml
rename to schemas/20251121/linkml/modules/slots/archive/warehouse_managed_by_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/warehouse_name.yaml b/schemas/20251121/linkml/modules/slots/archive/warehouse_name_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/warehouse_name.yaml
rename to schemas/20251121/linkml/modules/slots/archive/warehouse_name_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/warehouse_security_level.yaml b/schemas/20251121/linkml/modules/slots/archive/warehouse_security_level_archived_20260114.yaml
similarity index 100%
rename from schemas/20251121/linkml/modules/slots/warehouse_security_level.yaml
rename to schemas/20251121/linkml/modules/slots/archive/warehouse_security_level_archived_20260114.yaml
diff --git a/schemas/20251121/linkml/modules/slots/slot_fixes.yaml b/schemas/20251121/linkml/modules/slots/slot_fixes.yaml
index 1a36db828f..f2c831fc33 100644
--- a/schemas/20251121/linkml/modules/slots/slot_fixes.yaml
+++ b/schemas/20251121/linkml/modules/slots/slot_fixes.yaml
@@ -1579,24 +1579,56 @@ fixes:
           type: slot
         - label: SecurityLevel
           type: class
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: |
+          Migration completed for warehouse_security_level slot.
+          Reused: has_or_had_security_level slot, SecurityLevel class
+          Consuming classes updated: Warehouse.yaml
+          Archived slot: modules/slots/archive/warehouse_security_level_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_name
       revision:
         - label: has_or_had_label
           type: slot
         - label: Label
           type: class
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: |
+          Migration completed for warehouse_name slot.
+          Reused: has_or_had_label slot
+          Consuming classes updated: Warehouse.yaml
+          Archived slot: modules/slots/archive/warehouse_name_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_managed_by
       revision:
         - label: is_or_was_managed_by
           type: slot
         - label: Group
           type: class
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: |
+          Migration completed for warehouse_managed_by slot.
+          Reused: is_or_was_managed_by slot, Group class
+          Consuming classes updated: Warehouse.yaml
+          Archived slot: modules/slots/archive/warehouse_managed_by_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_id
       revision:
         - label: has_or_had_identifier
           type: slot
         - label: Identifier
           type: class
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: |
+          Migration completed for warehouse_id slot.
+          Reused: has_or_had_identifier slot (with uriorcurie range)
+          Consuming classes updated: Warehouse.yaml
+          Archived slot: modules/slots/archive/warehouse_id_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_floor_area_sqm
       revision:
         - label: has_or_had_area
@@ -1607,12 +1639,28 @@ fixes:
           type: slot
         - label: MeasureUnit
           type: class
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: |
+          Migration completed for warehouse_floor_area_sqm slot.
+          Reused: has_or_had_area slot, Area class (with has_or_had_unit + MeasureUnit)
+          Consuming classes updated: Warehouse.yaml
+          Archived slot: modules/slots/archive/warehouse_floor_area_sqm_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/warehouse_description
       revision:
         - label: has_or_had_description
           type: slot
         - label: Description
           type: class
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: |
+          Migration completed for warehouse_description slot.
+          Reused: has_or_had_description slot, Description class
+          Consuming classes updated: Warehouse.yaml
+          Archived slot: modules/slots/archive/warehouse_description_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/volunteer_program
       revision:
         - label: has_or_had_program
@@ -1758,6 +1806,11 @@ fixes:
           (raw API response capture) - evaluated but not migrated per data pattern.
           Archived slot: modules/slots/archive/view_count_archived_20260115.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/video_id
+      processed:
+        status: true
+        timestamp: '2026-01-14T13:00:00Z'
+        session: "session-2026-01-14-identifier-migrations"
+        notes: "FULLY MIGRATED: VideoChapterList - video_id REMOVED. Using has_or_had_identifier with VideoIdentifier class. Slot archived to archive/video_id_archived_20260114.yaml."
       revision:
         - label: has_or_had_identifier
           type: slot
@@ -1770,6 +1823,11 @@ fixes:
         - label: Comment
           type: class
     - original_slot_id: https://nde.nl/ontology/hc/slot/video_category_id
+      processed:
+        status: true
+        timestamp: '2026-01-14T12:45:00Z'
+        session: "session-2026-01-14-identifier-migrations"
+        notes: "FULLY MIGRATED: VideoPost - video_category_id REMOVED. Using has_or_had_identifier with VideoCategoryIdentifier class. Slot archived to archive/video_category_id_archived_20260114.yaml."
       revision:
         - label: has_or_had_identifier
           type: slot
@@ -1815,12 +1873,28 @@ fixes:
           type: slot
         - label: URL
           type: class
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: |
+          Migration completed for vendor_url slot.
+          Reused: has_or_had_url slot, URL class
+          Consuming classes updated: CollectionManagementSystem.yaml
+          Archived slot: modules/slots/archive/vendor_url_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/vendor_name
       revision:
         - label: has_or_had_label
           type: slot
         - label: Label
           type: class
+      processed:
+        status: true
+        date: "2026-01-14"
+        notes: |
+          Migration completed for vendor_name slot.
+          Reused: has_or_had_label slot, Label class
+          Consuming classes updated: CollectionManagementSystem.yaml
+          Archived slot: modules/slots/archive/vendor_name_archived_20260114.yaml
     - original_slot_id: https://nde.nl/ontology/hc/slot/variant_of_name
       revision:
         - label: is_or_was_alternative_form_of
@@ -2001,12 +2075,22 @@ fixes:
         - label: Label
           type: class
     - original_slot_id: https://nde.nl/ontology/hc/slot/unit_identifier
+      processed:
+        status: true
+        timestamp: '2026-01-14T12:30:00Z'
+        session: "session-2026-01-14-identifier-migrations"
+        notes: "FULLY MIGRATED: StorageUnit - unit_identifier REMOVED. Using has_or_had_identifier with UnitIdentifier class. Slot archived to archive/unit_identifier_archived_20260114.yaml."
       revision:
         - label: has_or_had_identifier
           type: slot
         - label: Identifier
           type: class
     - original_slot_id: https://nde.nl/ontology/hc/slot/unit_id 
+      processed:
+        status: true
+        timestamp: '2026-01-14T12:30:00Z'
+        session: "session-2026-01-14-identifier-migrations"
+        notes: "FULLY MIGRATED: StorageUnit - unit_id REMOVED. Using has_or_had_identifier with UnitIdentifier class. Slot archived to archive/unit_id_archived_20260114.yaml."
       revision:
         - label: has_or_had_identifier
           type: slot
@@ -2450,6 +2534,11 @@ fixes:
         - label: TraditionalProductTypes
           type: class
     - original_slot_id: https://nde.nl/ontology/hc/slot/tracking_ids_assigned
+      processed:
+        status: true
+        timestamp: '2026-01-14T12:15:00Z'
+        session: "session-2026-01-14-identifier-migrations"
+        notes: "FULLY MIGRATED: VideoObjectDetection - tracking_ids_assigned REMOVED. Count of tracking IDs now represented through existing has_or_had_quantity slot with Quantity class. Slot archived to archive/tracking_ids_assigned_archived_20260114.yaml."
       revision:
         - label: has_or_had_identifier
           type: slot
@@ -2466,6 +2555,11 @@ fixes:
         - label: Label
           type: class
     - original_slot_id: https://nde.nl/ontology/hc/slot/track_id
+      processed:
+        status: true
+        timestamp: '2026-01-14T12:00:00Z'
+        session: "session-2026-01-14-identifier-migrations"
+        notes: "FULLY MIGRATED: VideoSubtitle - track_id REMOVED, using has_or_had_identifier with TrackIdentifier range. Slot archived to archive/track_id_archived_20260114.yaml."
       revision:
         - label: has_or_had_identifier
           type: slot
@@ -2945,4 +3039,43 @@ fixes:
           type: slot  
         - label: TextTypes
           type: class
-    - original_slot_id: https://nde.nl/ontology/hc/slot/text_region_count
\ No newline at end of file
+    - original_slot_id: https://nde.nl/ontology/hc/slot/text_region_count
+      revision:
+        - label: has_or_had_quantity
+          type: slot
+        - label: Quantity
+          type: class
+        - label: has_or_had_measurement_unit
+          type: slot
+        - label: MeasurementUnit  
+          type: class
+          value:
+            - text_region
+    - original_slot_id: https://nde.nl/ontology/hc/slot/text_languages_detected
+      revision:
+        - label: has_or_had_text
+          type: slot
+        - label: Text
+          type: class 
+        - label: has_or_had_language
+          type: slot  
+        - label: Language
+          type: class
+        - label: has_or_had_identifier
+          type: slot
+        - label: ISO639-3Identifier
+          type: class
+    - original_slot_id: https://nde.nl/ontology/hc/slot/text_fragment
+      revision:
+        - label: has_or_had_text
+          type: slot
+        - label: Text
+          type: class
+        - label: has_or_had_segment
+          type: slot
+        - label: TextSegment
+          type: class
+        - label: has_or_had_url
+          type: slot
+        - label: URL
+          type: class
\ No newline at end of file