diff --git a/alembic/latiss/versions/56077b746de8_add_unique_constraint_for_day_obs_seq_.py b/alembic/latiss/versions/56077b746de8_add_unique_constraint_for_day_obs_seq_.py
index fb236ce9..19120a3b 100644
--- a/alembic/latiss/versions/56077b746de8_add_unique_constraint_for_day_obs_seq_.py
+++ b/alembic/latiss/versions/56077b746de8_add_unique_constraint_for_day_obs_seq_.py
@@ -9,9 +9,6 @@
 from typing import Sequence, Union
 
 from alembic import op
-import sqlalchemy as sa
-from sqlalchemy.dialects import mysql
-from sqlalchemy.dialects import postgresql
 
 # revision identifiers, used by Alembic.
 revision: str = "56077b746de8"
diff --git a/alembic/lsstcomcam/versions/67319407b5fc_add_unique_constraint_for_day_obs_seq_.py b/alembic/lsstcomcam/versions/67319407b5fc_add_unique_constraint_for_day_obs_seq_.py
index 0e6a4746..e5c2dae5 100644
--- a/alembic/lsstcomcam/versions/67319407b5fc_add_unique_constraint_for_day_obs_seq_.py
+++ b/alembic/lsstcomcam/versions/67319407b5fc_add_unique_constraint_for_day_obs_seq_.py
@@ -9,9 +9,6 @@
 from typing import Sequence, Union
 
 from alembic import op
-import sqlalchemy as sa
-from sqlalchemy.dialects import mysql
-from sqlalchemy.dialects import postgresql
 
 # revision identifiers, used by Alembic.
 revision: str = "67319407b5fc"
diff --git a/alembic/lsstcomcamsim/versions/02f64409522c_add_unique_constraint_for_day_obs_seq_.py b/alembic/lsstcomcamsim/versions/02f64409522c_add_unique_constraint_for_day_obs_seq_.py
index 146c1c7b..dba92a7c 100644
--- a/alembic/lsstcomcamsim/versions/02f64409522c_add_unique_constraint_for_day_obs_seq_.py
+++ b/alembic/lsstcomcamsim/versions/02f64409522c_add_unique_constraint_for_day_obs_seq_.py
@@ -9,9 +9,6 @@
 from typing import Sequence, Union
 
 from alembic import op
-import sqlalchemy as sa
-from sqlalchemy.dialects import mysql
-from sqlalchemy.dialects import postgresql
 
 # revision identifiers, used by Alembic.
 revision: str = "02f64409522c"