diff --git a/alembic/versions/0073_workspace_deleted_at.py b/alembic/versions/0073_workspace_deleted_at.py
new file mode 100644
index 0000000..44a0700
--- /dev/null
+++ b/alembic/versions/0073_workspace_deleted_at.py
@@ -0,0 +1,27 @@
+"""Add deleted_at to workspace tables (TenantMixin includes SoftDeleteMixin).
+
+Revision ID: 0073
+Revises: 0072
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "0073"
+down_revision = "0072"
+branch_labels = None
+depends_on = None
+
+TABLES = ["workspaces", "workspace_modules", "workspace_users", "workspace_widgets"]
+
+
+def upgrade() -> None:
+    for table in TABLES:
+        op.add_column(table, sa.Column("deleted_at", sa.DateTime(timezone=True), nullable=True))
+        op.execute(f"CREATE INDEX IF NOT EXISTS ix_{table}_deleted_at ON {table} (deleted_at)")
+
+
+def downgrade() -> None:
+    for table in TABLES:
+        op.drop_index(f"ix_{table}_deleted_at", table_name=table)
+        op.drop_column(table, "deleted_at")