fix: division by zero error

Author: hackeresq

app/Models/DailyChange.php

@@ -99,8 +99,11 @@ public function scopeWithDailyPerformance($query)
                 'tx1.quantity',
             ])
             ->selectRaw("(CASE
-                WHEN tx1.transaction_type = 'BUY'
-                    THEN COALESCE(cr.rate, 1)
+                WHEN 
+                    tx1.transaction_type = 'BUY' 
+                    OR SUM(tx1.cost_basis_base) = 0
+                THEN 
+                    COALESCE(cr.rate, 1)
                 ELSE (
                     SELECT
                         SUM(COALESCE(cr2.rate, 1) * buy.cost_basis_base)

app/Models/Holding.php

@@ -302,8 +302,11 @@ public function scopeWithPortfolioMetrics($query, $currency = null): mixed
                             ])
                             ->selectRaw(
                                 "(CASE
-                                        WHEN transactions.transaction_type = 'BUY'
-                                            THEN COALESCE(cr.rate, 1)
+                                        WHEN 
+                                            transactions.transaction_type = 'BUY'
+                                            OR SUM(transactions.cost_basis_base) = 0
+                                        THEN 
+                                            COALESCE(cr.rate, 1)
                                         ELSE (
                                             SELECT
                                                 SUM(COALESCE(cr2.rate, 1) * buy.cost_basis_base)