Fixed latest migration that cleared history for sqlite users.

migrations/versions/cee6a710cb71_.py

@@ -15,40 +15,21 @@
 branch_labels = None
 depends_on = None
 
+bind = op.get_context().bind
+
 
 def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
-    with op.batch_alter_table('table_episodes', schema=None) as batch_op:
-        batch_op.alter_column('file_size',
-                              existing_type=sa.INTEGER(),
-                              type_=sa.BigInteger(),
-                              existing_nullable=True,
-                              existing_server_default=sa.text('0'))
-
-    with op.batch_alter_table('table_movies', schema=None) as batch_op:
-        batch_op.alter_column('file_size',
-                              existing_type=sa.INTEGER(),
-                              type_=sa.BigInteger(),
-                              existing_nullable=True,
-                              existing_server_default=sa.text('0'))
+    if bind.engine.name == 'postgresql':
+        with op.batch_alter_table('table_episodes') as batch_op:
+            batch_op.alter_column('file_size', type_=sa.BigInteger())
 
+        with op.batch_alter_table('table_movies') as batch_op:
+            batch_op.alter_column('file_size', type_=sa.BigInteger())
     # ### end Alembic commands ###
 
 
 def downgrade():
     # ### commands auto generated by Alembic - please adjust! ###
-    with op.batch_alter_table('table_movies', schema=None) as batch_op:
-        batch_op.alter_column('file_size',
-                              existing_type=sa.BigInteger(),
-                              type_=sa.INTEGER(),
-                              existing_nullable=True,
-                              existing_server_default=sa.text('0'))
-
-    with op.batch_alter_table('table_episodes', schema=None) as batch_op:
-        batch_op.alter_column('file_size',
-                              existing_type=sa.BigInteger(),
-                              type_=sa.INTEGER(),
-                              existing_nullable=True,
-                              existing_server_default=sa.text('0'))
-
+    pass
     # ### end Alembic commands ###