diff --git a/alembic/versions/0074_workspace_users_timestamps.py b/alembic/versions/0074_workspace_users_timestamps.py
new file mode 100644
index 0000000..ad3e282
--- /dev/null
+++ b/alembic/versions/0074_workspace_users_timestamps.py
@@ -0,0 +1,31 @@
+"""Add created_at/updated_at to workspace_users and workspace_widgets.
+
+TenantMixin inherits from TimestampMixin which adds created_at and updated_at.
+Migration 0072 only added assigned_at to workspace_users, not created_at/updated_at.
+
+Revision ID: 0074
+Revises: 0073
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "0074"
+down_revision = "0073"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # workspace_users: add created_at and updated_at
+    op.add_column("workspace_users", sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.text("NOW()"), nullable=False))
+    op.add_column("workspace_users", sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.text("NOW()"), nullable=False))
+
+    # workspace_widgets: already has created_at/updated_at from migration 0072
+    # workspace_modules: already has created_at/updated_at from migration 0072
+    # workspaces: already has created_at/updated_at from migration 0072
+
+
+def downgrade() -> None:
+    op.drop_column("workspace_users", "updated_at")
+    op.drop_column("workspace_users", "created_at")