migration for target table

Summary: This contains the migration code for the Bazel target table.

Test Plan: manual testing

Reviewers: anupc

Reviewed By: anupc

Subscribers: changesbot, kylec

Differential Revision: https://tails.corp.dropbox.com/D224290

migrations/versions/28374b800521_added_target_table.py

@@ -0,0 +1,41 @@
+"""Added target table
+
+Revision ID: 28374b800521
+Revises: 460741ff1212
+Create Date: 2016-08-24 23:55:14.231624
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '28374b800521'
+down_revision = '460741ff1212'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.create_table(
+        'bazeltarget',
+        sa.Column('id', sa.GUID(), nullable=False),
+        sa.Column('step_id', sa.GUID(), nullable=False),
+        sa.Column('job_id', sa.GUID(), nullable=False),
+        sa.Column('name', sa.Text(), nullable=False),
+        sa.Column('status', sa.Enum(), nullable=False),
+        sa.Column('result', sa.Enum(), nullable=False),
+        sa.Column('duration', sa.Integer(), nullable=True),
+        sa.Column('date_created', sa.DateTime(), nullable=False),
+        sa.ForeignKeyConstraint(
+            ['step_id'], ['jobstep.id'], ondelete='CASCADE'),
+        sa.ForeignKeyConstraint(
+            ['job_id'], ['job.id'], ondelete='CASCADE'),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.add_column('test', sa.Column('target_id', sa.GUID(), nullable=True))
+    op.create_foreign_key('test_target_id_fkey', 'test', 'bazeltarget', ['target_id'], ['id'], ondelete='CASCADE')
+
+
+def downgrade():
+    op.drop_constraint('test_target_id_fkey', 'test')
+    op.drop_column('test', 'target_id')
+    op.drop_table('bazeltarget')