Implement alemic database migrations

webapp/alembic/versions/347cb289508e_create_keyvalue_table.py

@@ -0,0 +1,30 @@
+"""Create keyvalue table
+
+Revision ID: 347cb289508e
+Revises: a785afdbfa91
+Create Date: 2017-05-30 20:16:22.543157
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '347cb289508e'
+down_revision = 'a785afdbfa91'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.create_table(
+        'keyvalue_properties',
+        sa.Column('id', sa.Integer, primary_key=True),
+        sa.Column('key', sa.String(255), nullable=False),
+        sa.Column('value', sa.Text()),
+        sa.Column('expiration', sa.TIMESTAMP),
+    )
+
+
+def downgrade():
+    op.drop_table('keyvalue_properties')