Add migration script for corpora table.

migrations/versions/60d474dea68f_add_corpora_table.py

+"""Add corpora table
+
+Revision ID: 60d474dea68f
+Revises: 717796966c8c
+Create Date: 2019-08-06 12:03:30.639380
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '60d474dea68f'
+down_revision = '717796966c8c'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('corpora',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('description', sa.String(length=64), nullable=True),
+    sa.Column('title', sa.String(length=32), nullable=True),
+    sa.Column('user_id', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('corpora')
+    # ### end Alembic commands ###