feat: 导入 MemRelay 初始源码

backend/migrations/versions/20260806_0013_upload_provenance.py

@@ -0,0 +1,35 @@
+"""Persist upload activity provenance."""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "20260806_0013"
+down_revision: str | Sequence[str] | None = "20260806_0012"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    with op.batch_alter_table("upload_tasks") as batch:
+        batch.add_column(sa.Column("usage_profile_id", sa.String(length=36), nullable=True))
+        batch.add_column(
+            sa.Column("origin", sa.String(length=20), nullable=False, server_default="user")
+        )
+        batch.create_index("ix_upload_tasks_usage_profile_id", ["usage_profile_id"])
+        batch.create_foreign_key(
+            "fk_upload_tasks_usage_profile_id",
+            "usage_profiles",
+            ["usage_profile_id"],
+            ["id"],
+            ondelete="SET NULL",
+        )
+
+
+def downgrade() -> None:
+    with op.batch_alter_table("upload_tasks") as batch:
+        batch.drop_constraint("fk_upload_tasks_usage_profile_id", type_="foreignkey")
+        batch.drop_index("ix_upload_tasks_usage_profile_id")
+        batch.drop_column("origin")
+        batch.drop_column("usage_profile_id")