Update env.py

Fixing trim bugs.

backend/alembic/env.py

@@ -1,27 +1,21 @@
+@@ -1,63 +1,61 @@
 import logging
-
 from alembic import context
 from oasst_backend import models  # noqa: F401
 from sqlalchemy import engine_from_config, pool
-
 # Read in the Alembic config file.
 config = context.config
-
 # Set up loggers.
 if config.config_file_name is not None:
     logging.config.fileConfig(config.config_file_name)
-
 # Add the model's MetaData object here for 'autogenerate' support.
 target_metadata = models.Base.metadata
-
 # Other values from the config file can be acquired as follows:
 # my_important_option = config.get_main_option("my_important_option")
 # ... etc.
-
-
 def run_migrations_offline() -> None:
     """Run migrations in 'offline' mode.
-    
+
     This configures the context with just a URL and not an Engine, though
     an Engine is acceptable here as well. By skipping the Engine creation
     we don't even need a DBAPI to be available.
@@ -30,14 +24,11 @@ def run_migrations_offline() -> None:
     context.configure(
         url=url, target_metadata=target_metadata, literal_binds=True, dialect_opts={"paramstyle": "named"}
     )
-
     with context.begin_transaction():
         context.run_migrations()
-
-
 def run_migrations_online() -> None:
     """Run migrations in 'online' mode.
-    
+
     In this scenario we need to create an Engine and associate a connection
     with the context.
     """
@@ -46,15 +37,14 @@ def run_migrations_online() -> None:
         prefix="sqlalchemy.",
         poolclass=pool.NullPool,
     )
-
     with connectable.connect() as connection:
         context.configure(connection=connection, target_metadata=target_metadata)
-
         with context.begin_transaction():
             context.get_context()._ensure_version_table()
             connection.execute("LOCK TABLE alembic_version IN ACCESS EXCLUSIVE MODE")
             context.run_migrations()
 
+
 if context.is_offline_mode():
     run_migrations_offline()
 else: