diff --git a/AGENTS.md b/AGENTS.md
index 96816a2..a558ce7 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -45,7 +45,7 @@
 <claude-mem-context>
 # Memory Context
 
-# $CMEM MemeMind-Server 2026-05-10 3:41pm GMT+8
+# $CMEM MemeMind-Server 2026-05-10 9:17pm GMT+8
 
 No previous sessions found.
 </claude-mem-context>
\ No newline at end of file
diff --git a/src/modules/share/repositories/share-participant.repository.ts b/src/modules/share/repositories/share-participant.repository.ts
index fb65456..c8e0669 100644
--- a/src/modules/share/repositories/share-participant.repository.ts
+++ b/src/modules/share/repositories/share-participant.repository.ts
@@ -75,9 +75,11 @@ export class ShareParticipantRepository {
       .insert()
       .into(ShareParticipant)
       .values(data)
+      // TypeORM passes these identifiers through in MySQL ON DUPLICATE KEY
+      // UPDATE, so use database column names instead of entity property names.
       .orUpdate(
-        ['correctCount', 'totalTimeSpent', 'submittedAt'],
-        ['shareConfigId', 'participantId'],
+        ['correct_count', 'total_time_spent', 'submitted_at'],
+        ['share_config_id', 'participant_id'],
       )
       .execute();
   }