Add cascade behavior constants to constants.py

Move cascade behavior string values ("Cascade", "NoCascade", "RemoveLink",
"Restrict") to constants.py per PR review feedback. Update CascadeConfiguration
to use these constants for its default values.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: tpellissier

src/PowerPlatform/Dataverse/common/constants.py

@@ -14,3 +14,9 @@
 ODATA_TYPE_LOOKUP_ATTRIBUTE = "Microsoft.Dynamics.CRM.LookupAttributeMetadata"
 ODATA_TYPE_ONE_TO_MANY_RELATIONSHIP = "Microsoft.Dynamics.CRM.OneToManyRelationshipMetadata"
 ODATA_TYPE_MANY_TO_MANY_RELATIONSHIP = "Microsoft.Dynamics.CRM.ManyToManyRelationshipMetadata"
+
+# Cascade behavior values for relationship operations
+CASCADE_BEHAVIOR_CASCADE = "Cascade"
+CASCADE_BEHAVIOR_NO_CASCADE = "NoCascade"
+CASCADE_BEHAVIOR_REMOVE_LINK = "RemoveLink"
+CASCADE_BEHAVIOR_RESTRICT = "Restrict"

src/PowerPlatform/Dataverse/models/metadata.py

@@ -21,6 +21,10 @@
     ODATA_TYPE_LOOKUP_ATTRIBUTE,
     ODATA_TYPE_ONE_TO_MANY_RELATIONSHIP,
     ODATA_TYPE_MANY_TO_MANY_RELATIONSHIP,
+    CASCADE_BEHAVIOR_CASCADE,
+    CASCADE_BEHAVIOR_NO_CASCADE,
+    CASCADE_BEHAVIOR_REMOVE_LINK,
+    CASCADE_BEHAVIOR_RESTRICT,
 )
 
 
@@ -143,12 +147,12 @@ class CascadeConfiguration:
         - "Restrict": Prevent the operation if related records exist
     """
 
-    assign: str = "NoCascade"
-    delete: str = "RemoveLink"
-    merge: str = "NoCascade"
-    reparent: str = "NoCascade"
-    share: str = "NoCascade"
-    unshare: str = "NoCascade"
+    assign: str = CASCADE_BEHAVIOR_NO_CASCADE
+    delete: str = CASCADE_BEHAVIOR_REMOVE_LINK
+    merge: str = CASCADE_BEHAVIOR_NO_CASCADE
+    reparent: str = CASCADE_BEHAVIOR_NO_CASCADE
+    share: str = CASCADE_BEHAVIOR_NO_CASCADE
+    unshare: str = CASCADE_BEHAVIOR_NO_CASCADE
     additional_properties: Optional[Dict[str, Any]] = None
 
     def to_dict(self) -> Dict[str, Any]: