WS-161, WS-162: view for download data volume metrics

schema/versions/1aee35976c94_add_download_metrics_view_1.py

+"""add download metrics view 1
+
+Revision ID: 1aee35976c94
+Revises: 565c61a53263
+Create Date: 2021-03-31 11:57:31.893606
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '1aee35976c94'
+down_revision = '565c61a53263'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.execute("""
+    CREATE VIEW download_metrics as
+    SELECT ce.capability_request_id as request_id,
+       cr.capability_name as cap_name,
+       ce.created_at as execution_created,
+       ce.state as state,
+       cr.parameters->>'product_locator' as product_locator,
+       sp.filegroup_id,
+       f.datasize
+    FROM capability_executions ce
+         JOIN capability_requests cr on cr.capability_request_id = ce.capability_request_id
+         JOIN science_products sp on parameters->>'product_locator' = sp.science_product_locator
+         JOIN filegroups f on sp.filegroup_id = f.parent_filegroup_id
+    WHERE capability_name = 'test_download'
+    """)
+
+
+def downgrade():
+    op.execute("""
+    DROP VIEW IF EXISTS download_metrics
+    """)