feat: 支持研究素材删除并统一 Semi 表格

backend/migrations/versions/0014_research_experiment_archive.py

@@ -0,0 +1,20 @@
+"""Hide deleted research experiments while preserving candidate and source history."""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "0014"
+down_revision = "0013"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.add_column(
+        "research_experiments",
+        sa.Column("archived", sa.Boolean(), nullable=False, server_default=sa.false()),
+    )
+
+
+def downgrade():
+    op.drop_column("research_experiments", "archived")