diff --git a/app/models/event_file_models.py b/app/models/event_file_models.py
index 247045d..0c7c10a 100644
--- a/app/models/event_file_models.py
+++ b/app/models/event_file_models.py
@@ -49,30 +49,53 @@ class Event_File_Base(BaseModel):
         """
         Vision Transformer:
         Map DB keys to clean API keys and strip internal integers during READ operations.
-        During CREATE (POST) operations, we ensure resolved integers are preserved.
+        Falls back to Redis/DB lookups if random string IDs are missing from the view.
         """
-        # 1. Map Random Strings to Clean Names
+        # 1. Map Primary Object ID
         rid = values.get('id_random') or values.get('event_file_id_random')
         if rid and isinstance(rid, str):
             values['id'] = rid
             values['event_file_id'] = rid
             
-        if h_rid := values.get('hosted_file_id_random'): values['hosted_file_id'] = h_rid
-        if f_rid := values.get('for_id_random'): values['for_id'] = f_rid
-        if e_rid := values.get('event_id_random'): values['event_id'] = e_rid
-        if ex_rid := values.get('event_exhibit_id_random'): values['event_exhibit_id'] = ex_rid
-        if loc_rid := values.get('event_location_id_random'): values['event_location_id'] = loc_rid
-        if pres_rid := values.get('event_presentation_id_random'): values['event_presentation_id'] = pres_rid
-        if pr_rid := values.get('event_presenter_id_random'): values['event_presenter_id'] = pr_rid
-        if s_rid := values.get('event_session_id_random'): values['event_session_id'] = s_rid
-        if t_rid := values.get('event_track_id_random'): values['event_track_id'] = t_rid
-            
-        # 2. Prevent leakage of integers during API responses (Vision Standard)
-        id_fields = [
-            'id', 'event_file_id', 'hosted_file_id', 'for_id', 'event_id', 
-            'event_exhibit_id', 'event_location_id', 'event_presentation_id', 
-            'event_presenter_id', 'event_session_id', 'event_track_id'
+        # 2. Map & Resolve Relational IDs
+        # (Field Name, Table Name)
+        id_map = [
+            ('hosted_file_id', 'hosted_file'),
+            ('event_id', 'event'),
+            ('event_exhibit_id', 'event_exhibit'),
+            ('event_location_id', 'event_location'),
+            ('event_presentation_id', 'event_presentation'),
+            ('event_presenter_id', 'event_presenter'),
+            ('event_session_id', 'event_session'),
+            ('event_track_id', 'event_track'),
+            ('lu_file_purpose_id', 'lu_file_purpose'),
         ]
+        
+        # 2a. Handle specific relational fields
+        for field, table in id_map:
+            # Check for existing random string version
+            r_val = values.get(f'{field}_random')
+            if r_val and isinstance(r_val, str):
+                values[field] = r_val
+            elif values.get(field) and isinstance(values[field], int):
+                # Fallback: Resolve from Redis/DB if missing from view result
+                resolved_rid = get_id_random(values[field], table)
+                if resolved_rid:
+                    values[field] = resolved_rid
+                    values[f'{field}_random'] = resolved_rid
+                    
+        # 2b. Handle Polymorphic for_id
+        if f_rid := values.get('for_id_random'):
+            values['for_id'] = f_rid
+        elif values.get('for_id') and isinstance(values.get('for_id'), int) and values.get('for_type'):
+            # Resolve based on the for_type
+            resolved_for_rid = get_id_random(values['for_id'], values['for_type'])
+            if resolved_for_rid:
+                values['for_id'] = resolved_for_rid
+                values['for_id_random'] = resolved_for_rid
+
+        # 3. Final Vision Enforcement: Strip internal integers
+        id_fields = [f for f, t in id_map] + ['id', 'event_file_id', 'for_id']
         for k in id_fields:
             val = values.get(k)
             if val is not None and not isinstance(val, str):
diff --git a/tests/e2e/test_e2e_v3_demo_parity.py b/tests/e2e/test_e2e_v3_demo_parity.py
index 818a3dd..50a5dc4 100644
--- a/tests/e2e/test_e2e_v3_demo_parity.py
+++ b/tests/e2e/test_e2e_v3_demo_parity.py
@@ -11,7 +11,8 @@ API_KEY = "PMM4n50teUCaOMMTN8qOJA" # Agent API Key
 TARGETS = [
     ("event_badge", "JPUG-87-80-88"),
     ("event_exhibit", "xK_9yEj1bQY"),
-    ("event_exhibit_tracking", "KVypw_xntSY")
+    ("event_exhibit_tracking", "KVypw_xntSY"),
+    ("event_file", "a2pPIT_W28o") # Regression Target for Relational ID bug
 ]
 
 def get_headers():