diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 3ce93aa9..f6b8364b 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -17,7 +17,7 @@ build:
       - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH python -m poetry install --no-root --all-extras --with docs --without dev,test
       - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH python -m poetry show -v
       - python -m pip list -v
-      - SYNCMASTER__DATABASE__URL=postgresql+psycopg://fake:fake@127.0.0.1:5432/fake SYNCMASTER__BROKER__URL=amqp://fake:faket@fake:5672/ SYNCMASTER__CRYPTO_KEY=crypto_key  python -m syncmaster.backend.export_openapi_schema docs/_static/openapi.json
+      - SYNCMASTER__DATABASE__URL=postgresql+psycopg://fake:fake@127.0.0.1:5432/fake SYNCMASTER__BROKER__URL=amqp://fake:faket@fake:5672/ SYNCMASTER__CRYPTO_KEY=crypto_key SYNCMASTER__AUTH__ACCESS_TOKEN__SECRET_KEY=fakepython python -m syncmaster.backend.export_openapi_schema docs/_static/openapi.json
 
 sphinx:
   configuration: docs/conf.py
diff --git a/syncmaster/db/migrations/versions/2023-11-23_0001_create_user_table.py b/syncmaster/db/migrations/versions/2023-11-23_0001_create_user_table.py
index caee463e..9603efa7 100644
--- a/syncmaster/db/migrations/versions/2023-11-23_0001_create_user_table.py
+++ b/syncmaster/db/migrations/versions/2023-11-23_0001_create_user_table.py
@@ -32,6 +32,7 @@ def upgrade():
         sa.Column("updated_at", sa.DateTime(), server_default=sa.text("now()"), nullable=False),
         sa.Column("is_deleted", sa.Boolean(), nullable=False),
         sa.PrimaryKeyConstraint("id", name=op.f("pk__user")),
+        sa.UniqueConstraint("email", name=op.f("uq__user__email")),
     )
     op.create_index(op.f("ix__user__username"), "user", ["username"], unique=True)