add index to speed up artifact queries (#241)

Co-authored-by: Shuchang Zheng <wintonzheng0325@gmail.com>

alembic/versions/2024_04_28_2320-68d78072fdb5_add_org_task_step_index.py

@@ -0,0 +1,28 @@
+"""Add org_task_step_index
+
+Revision ID: 68d78072fdb5
+Revises: 24303f1669a7
+Create Date: 2024-04-28 23:20:28.953686+00:00
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "68d78072fdb5"
+down_revision: Union[str, None] = "24303f1669a7"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_index("org_task_step_index", "artifacts", ["organization_id", "task_id", "step_id"], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index("org_task_step_index", table_name="artifacts")
+    # ### end Alembic commands ###