diff --git a/brmbar3/brmbar/Currency.py b/brmbar3/brmbar/Currency.py
index e204ac4..294d9f4 100644
--- a/brmbar3/brmbar/Currency.py
+++ b/brmbar3/brmbar/Currency.py
@@ -71,7 +71,9 @@ class Currency:
 
     def update_sell_rate(self, target, rate):
         # self.db.execute("INSERT INTO exchange_rates (source, target, rate, rate_dir) VALUES (%s, %s, %s, %s)", [self.id, target.id, rate, "source_to_target"])
-        self.db.execute("SELECT update_currency_sell_rate(%s, %s, %s)",
+        self.db.execute("SELECT public.update_currency_sell_rate(%s, %s, %s)",
                         [self.id, target.id, rate])
     def update_buy_rate(self, source, rate):
-        self.db.execute("INSERT INTO exchange_rates (source, target, rate, rate_dir) VALUES (%s, %s, %s, %s)", [source.id, self.id, rate, "target_to_source"])
+        # self.db.execute("INSERT INTO exchange_rates (source, target, rate, rate_dir) VALUES (%s, %s, %s, %s)", [source.id, self.id, rate, "target_to_source"])
+        self.db.execute("SELECT public.update_currency_buy_rate(%s, %s, %s)",
+                        [source.id, self.id, rate])
diff --git a/brmbar3/schema/0008-update-currency-buy-rate.sql b/brmbar3/schema/0008-update-currency-buy-rate.sql
new file mode 100644
index 0000000..cbab11b
--- /dev/null
+++ b/brmbar3/schema/0008-update-currency-buy-rate.sql
@@ -0,0 +1,49 @@
+--
+-- 0008-update-currency-buy-rate.sql
+--
+-- #8 - stored procedure for updating buy rate
+--
+-- ISC License
+--
+-- Copyright 2023-2025 Brmlab, z.s.
+-- Dominik Pantůček <dominik.pantucek@trustica.cz>
+--
+-- Permission to use, copy, modify, and/or distribute this software
+-- for any purpose with or without fee is hereby granted, provided
+-- that the above copyright notice and this permission notice appear
+-- in all copies.
+-- 
+-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+-- WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+-- WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+-- AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+-- CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+-- OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+-- NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+--
+
+-- Require fully-qualified names
+SELECT pg_catalog.set_config('search_path', '', false);
+
+DO $upgrade_block$
+BEGIN
+
+IF brmbar_privileged.has_exact_schema_version(7) THEN
+
+  CREATE OR REPLACE FUNCTION public.update_currency_buy_rate(
+    IN i_currency public.exchange_rates.target%TYPE,
+    IN i_source public.exchange_rates.source%TYPE,
+    IN i_rate public.exchange_rates.rate%TYPE
+  ) RETURNS VOID LANGUAGE plpgsql AS $$
+  BEGIN
+    INSERT INTO public.exchange_rates(source, target, rate, rate_dir)
+      VALUES (i_source, i_currency, i_rate, 'target_to_source');
+  END
+  $$;
+  
+  PERFORM brmbar_privileged.upgrade_schema_version_to(8);
+END IF;
+
+END;
+$upgrade_block$;