Implement alemic database migrations

webapp/alembic/versions/906a48cc55d0_create_authenticated_users_table.py

@@ -0,0 +1,30 @@
+"""create authenticated_users table
+
+Revision ID: 906a48cc55d0
+Revises:
+Create Date: 2017-05-30 19:47:38.457143
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '906a48cc55d0'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.create_table(
+        'authenticated_users',
+        sa.Column('id', sa.Integer, primary_key=True),
+        sa.Column('guild_id', sa.String(255), nullable=False),
+        sa.Column('client_id', sa.String(255), nullable=False),
+        sa.Column('last_timestamp', sa.TIMESTAMP, nullable=False),
+    )
+
+
+def downgrade():
+    op.drop_table('authenticated_users')