fix balances view.

LNbits/data/schema.sql

@@ -21,14 +21,18 @@ CREATE TABLE IF NOT EXISTS apipayments (
     memo text
 );
 
-CREATE VIEW IF NOT EXISTS balances AS
+DROP VIEW IF EXISTS balances;
+
+CREATE VIEW balances AS
   SELECT wallet, coalesce(sum(s), 0) AS balance FROM (
       SELECT wallet, sum(amount) AS s -- incoming
       FROM apipayments
       WHERE amount > 0 AND pending = false -- don't sum pending
+      GROUP BY wallet
     UNION ALL
       SELECT wallet, sum(amount + fee) AS s -- outgoing, sum fees
       FROM apipayments
       WHERE amount < 0 -- do sum pending
+      GROUP BY wallet
   )
   GROUP BY wallet;