diff --git a/api/migrations/versions/5de9b1e28509_20260129212722.py b/api/migrations/versions/5de9b1e28509_20260129212722.py
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+"""20260129212722
+
+Revision ID: 5de9b1e28509
+Revises: 5ca246ee7dd4
+Create Date: 2026-01-29 21:34:30.978031
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = '5de9b1e28509'
+down_revision: Union[str, None] = '5ca246ee7dd4'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Neo4j migration: rename group_id to end_user_id
+    import asyncio
+
+    from app.repositories.neo4j.neo4j_connector import Neo4jConnector
+    
+    async def run_neo4j_upgrade():
+        connector = Neo4jConnector()
+        try:
+            async def transaction_func(tx):
+                result = await tx.run("""
+                    MATCH (n)
+                    WHERE n.group_id IS NOT NULL
+                    SET n.end_user_id = n.group_id
+                    REMOVE n.group_id
+                    WITH count(n) AS node_count
+                    MATCH ()-[r]->()
+                    WHERE r.group_id IS NOT NULL
+                    SET r.end_user_id = r.group_id
+                    REMOVE r.group_id
+                    RETURN node_count, count(r) AS rel_count
+                """)
+                return await result.data()
+            
+            await connector.execute_write_transaction(transaction_func)
+        finally:
+            await connector.close()
+    
+    asyncio.run(run_neo4j_upgrade())
+
+
+def downgrade() -> None:
+    # Neo4j migration: rename end_user_id back to group_id
+    import asyncio
+
+    from app.repositories.neo4j.neo4j_connector import Neo4jConnector
+    
+    async def run_neo4j_downgrade():
+        connector = Neo4jConnector()
+        try:
+            async def transaction_func(tx):
+                result = await tx.run("""
+                    MATCH (n)
+                    WHERE n.end_user_id IS NOT NULL
+                    SET n.group_id = n.end_user_id
+                    REMOVE n.end_user_id
+                    WITH count(n) AS node_count
+                    MATCH ()-[r]->()
+                    WHERE r.end_user_id IS NOT NULL
+                    SET r.group_id = r.end_user_id
+                    REMOVE r.end_user_id
+                    RETURN node_count, count(r) AS rel_count
+                """)
+                return await result.data()
+            
+            await connector.execute_write_transaction(transaction_func)
+        finally:
+            await connector.close()
+    
+    asyncio.run(run_neo4j_downgrade())
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