diff --git a/backend/open_webui/migrations/versions/55f1302ac17c_add_memory_id_user_id_covering_index.py b/backend/open_webui/migrations/versions/55f1302ac17c_add_memory_id_user_id_covering_index.py
new file mode 100644
index 0000000000..d1de5c05b8
--- /dev/null
+++ b/backend/open_webui/migrations/versions/55f1302ac17c_add_memory_id_user_id_covering_index.py
@@ -0,0 +1,36 @@
+"""Add memory (id, user_id) covering index
+
+Revision ID: 55f1302ac17c
+Revises: b0018471bbbe
+Create Date: 2026-07-24 00:00:00.000000
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+
+revision: str = '55f1302ac17c'
+down_revision: Union[str, None] = 'b0018471bbbe'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+    inspector = sa.inspect(conn)
+    indexes = {index['name'] for index in inspector.get_indexes('memory')}
+
+    if 'ix_memory_id_user_id' not in indexes:
+        op.create_index('ix_memory_id_user_id', 'memory', ['id', 'user_id'])
+
+
+def downgrade() -> None:
+    conn = op.get_bind()
+    inspector = sa.inspect(conn)
+    indexes = {index['name'] for index in inspector.get_indexes('memory')}
+
+    if 'ix_memory_id_user_id' in indexes:
+        op.drop_index('ix_memory_id_user_id', table_name='memory')
diff --git a/backend/open_webui/models/memories.py b/backend/open_webui/models/memories.py
index 736726898e..e04f16b962 100644
--- a/backend/open_webui/models/memories.py
+++ b/backend/open_webui/models/memories.py
@@ -8,7 +8,7 @@ from typing import Literal
 
 from open_webui.internal.db import Base, get_async_db_context
 from pydantic import BaseModel, ConfigDict
-from sqlalchemy import JSON, BigInteger, Column, String, Text, delete, select
+from sqlalchemy import JSON, BigInteger, Column, Index, String, Text, delete, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 
@@ -16,6 +16,7 @@ class Memory(Base):  # user memory store
     """Stores user-created memory entries linked to a vector collection."""
 
     __tablename__ = 'memory'
+    __table_args__ = (Index('ix_memory_id_user_id', 'id', 'user_id'),)
 
     id = Column(String, primary_key=True, unique=True)
     user_id = Column(String, index=True)