added db migrations and group support, still problems with json serialization

migrations/versions/6f980d1e7ac5_.py

@@ -0,0 +1,35 @@
+"""empty message
+
+Revision ID: 6f980d1e7ac5
+Revises: 
+Create Date: 2019-04-02 13:33:29.319719
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '6f980d1e7ac5'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('groups',
+    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('name', sa.Unicode(length=64), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('name')
+    )
+    op.add_column('user', sa.Column('external_user', sa.Boolean(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('user', 'external_user')
+    op.drop_table('groups')
+    # ### end Alembic commands ###