feat: Migrate has_agreement_signed_date to is_or_was_based_on and add Agreement class and is_or_was_signed_on slot

frontend/public/schemas/20251121/linkml/manifest.json

@@ -1,5 +1,5 @@
 {
-  "generated": "2026-01-26T22:48:27.648Z",
+  "generated": "2026-01-26T23:49:30.478Z",
   "schemaRoot": "/schemas/20251121/linkml",
   "totalFiles": 3014,
   "categoryCounts": {

schemas/20251121/linkml/manifest.json

@@ -1,5 +1,5 @@
 {
-  "generated": "2026-01-26T23:49:30.478Z",
+  "generated": "2026-01-26T23:50:10.883Z",
   "schemaRoot": "/schemas/20251121/linkml",
   "totalFiles": 3014,
   "categoryCounts": {

schemas/20251121/linkml/modules/classes/Agreement.yaml

@@ -0,0 +1,53 @@
+# Agreement class
+# Represents a formal agreement, contract, or treaty
+#
+# Generation date: 2026-01-27
+# Rule compliance: 0b, 38, 39, 53
+#
+# Created for has_agreement_signed_date migration
+
+id: https://nde.nl/ontology/hc/class/Agreement
+name: Agreement
+title: Agreement Class
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+  dcterms: http://purl.org/dc/terms/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+  - ../slots/has_or_had_label
+  - ../slots/has_or_had_description
+  - ../slots/is_or_was_signed_on
+  - ../slots/temporal_extent
+  - ./TimeSpan
+
+classes:
+  Agreement:
+    class_uri: schema:Agreement
+    description: |
+      A formal agreement, contract, or treaty between parties.
+      
+      **Examples**:
+      - Loan Agreement
+      - Service Agreement
+      - Memorandum of Understanding
+      
+      **Ontological Alignment**:
+      - `schema:Agreement`: A generic agreement.
+    slots:
+      - has_or_had_label
+      - has_or_had_description
+      - is_or_was_signed_on
+      - temporal_extent
+    slot_usage:
+      has_or_had_label:
+        description: Title or name of the agreement.
+      is_or_was_signed_on:
+        description: Date the agreement was signed.
+      temporal_extent:
+        description: Validity period of the agreement.

schemas/20251121/linkml/modules/classes/Loan.yaml

@@ -16,7 +16,10 @@ imports:
   - ../enums/LoanStatusEnum
   - ../slots/has_approval_date
   - ../slots/has_actual_return_date
-  - ../slots/has_agreement_signed_date
+  - ../slots/is_or_was_based_on
+  - ../classes/Agreement
+  - ../slots/is_or_was_signed_on
+  - ../classes/Timestamp
   - ../slots/custody_received_by  # was: borrower - migrated per Rule 53/56 (2026-01-17)
   - ../slots/has_or_had_contact_point  # was: borrower_contact - migrated per Rule 53/56 (2026-01-17)
   # MIGRATED 2026-01-22: condition_on_return → is_or_was_returned + ReturnEvent (Rule 53)
@@ -97,7 +100,7 @@ classes:
     - schema:TransferAction
     slots:
     - temporal_extent  # was: has_actual_return_date - migrated per Rule 53 (2026-01-26)
-    - has_agreement_signed_date
+    - is_or_was_based_on
     - has_approval_date
     - custody_received_by  # was: borrower - migrated per Rule 53/56 (2026-01-17)
     - has_or_had_contact_point  # was: borrower_contact - migrated per Rule 53/56 (2026-01-17)
@@ -134,6 +137,16 @@ classes:
     - specificity_annotation
     - has_or_had_score  # was: template_specificity - migrated per Rule 53 (2026-01-17)
     slot_usage:
+      is_or_was_based_on:
+        range: Agreement
+        description: |
+          The formal agreement governing the loan.
+          Replaces has_agreement_signed_date per Rule 53.
+        examples:
+        - value:
+            has_or_had_label: "Loan Agreement 2023-001"
+            is_or_was_signed_on: "2022-03-15"
+          description: Signed loan agreement
       loan_id:
         identifier: true
         required: true
@@ -419,6 +432,9 @@ classes:
         request_date: '2021-06-15'
         approval_date: '2021-09-20'
         agreement_signed_date: '2022-03-15'
+        is_or_was_based_on:
+          has_or_had_label: "Loan Agreement 2023-001"
+          is_or_was_signed_on: "2022-03-15"
         loan_start_date: '2023-02-10'
         loan_end_date: '2023-06-04'
         temporal_extent:  # was: has_actual_return_date (2026-01-26)

schemas/20251121/linkml/modules/slots/is_or_was_signed_on.yaml

@@ -0,0 +1,40 @@
+# is_or_was_signed_on slot
+# Generic slot for signature dates
+#
+# Generation date: 2026-01-27
+# Rule compliance: 38, 39, 42
+#
+# Part of has_agreement_signed_date migration (Rule 53)
+
+id: https://nde.nl/ontology/hc/slot/is_or_was_signed_on
+name: is_or_was_signed_on_slot
+title: Is Or Was Signed On Slot
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  hc: https://nde.nl/ontology/hc/
+  schema: http://schema.org/
+
+default_prefix: hc
+
+imports:
+  - linkml:types
+
+slots:
+  is_or_was_signed_on:
+    slot_uri: schema:dateCreated
+    description: |
+      The date when an agreement, contract, or document was signed.
+      
+      **Temporal Semantics** (RiC-O Pattern):
+      "isOrWas" indicates the signing event in the past.
+      
+      **Ontological Alignment**:
+      - `schema:dateCreated`: The date on which the CreativeWork was created or the item was added to a DataFeed.
+      
+      **Range**:
+      - Can be a simple date string.
+      - Can be a structured date object if needed.
+    range: uriorcurie
+    multivalued: false
+    required: false