API & Client: display map image for activities w/ gpx on dashboard

mpwo_api/migrations/versions/9f8c9c37da44_.py

@@ -0,0 +1,28 @@
+"""empty message
+
+Revision ID: 9f8c9c37da44
+Revises: 5a42db64e872
+Create Date: 2018-05-30 12:48:11.714627
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '9f8c9c37da44'
+down_revision = '5a42db64e872'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('activities', sa.Column('map_id', sa.String(length=50), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('activities', 'map_id')
+    # ### end Alembic commands ###