Refactoring the code

- Use Flask blueprint
- Split model and views into smaller parts
- Bug fixes
- API adjustment

migrations/versions/0fb6d23a4863_remove_user_avatar.py

@@ -0,0 +1,28 @@
+"""Remove user avatar
+
+Revision ID: 0fb6d23a4863
+Revises: 654298797277
+Create Date: 2019-12-02 10:29:41.945044
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision = '0fb6d23a4863'
+down_revision = '654298797277'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('user', 'avatar')
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('user', sa.Column('avatar', mysql.VARCHAR(length=128), nullable=True))
+    # ### end Alembic commands ###