diff --git a/prisma/migrations/20261028080000_reset_inflated_portfolio_value_points/migration.sql b/prisma/migrations/20261028080000_reset_inflated_portfolio_value_points/migration.sql
new file mode 100644
index 0000000..74c1101
--- /dev/null
+++ b/prisma/migrations/20261028080000_reset_inflated_portfolio_value_points/migration.sql
@@ -0,0 +1,4 @@
+-- Points written before WealthLedger/backend#140 counted cash twice (cash balance
+-- plus the mirroring CURRENCY position). Historical compositions and FX rates are
+-- not stored, so the points cannot be recomputed exactly; history restarts here.
+DELETE FROM "TbankPortfolioValuePoint";