Migration of Database wrt extension_database

vispa/models/alembic/versions/2ab761fba36_extension_database.py

+"""Extension Database
+
+Revision ID: 2ab761fba36
+Revises: 17d572bdfd2d
+Create Date: 2015-07-13 15:37:11.904666
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '2ab761fba36'
+down_revision = '17d572bdfd2d'
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+def upgrade():
+    op.create_table('extension_database',
+                    sa.Column('extension_name', sa.Unicode(length=255), nullable=False),
+                    sa.Column('data', sa.Text(), nullable=True),
+                    sa.Column('timestamp', sa.DateTime(), nullable=False),
+                    sa.PrimaryKeyConstraint('extension_name'),
+                    )
+
+def downgrade():
+    op.drop_table('extension_database')