feat: add total balance calculation and display in account management; update account card to show calculated balance

services/banking.service.ts

@@ -369,7 +369,7 @@ export const bankingService = {
   },
 
   async getAccountsWithStats(): Promise<
-    Array<Account & { transactionCount: number }>
+    Array<Account & { transactionCount: number; calculatedBalance: number }>
   > {
     const accounts = await prisma.account.findMany({
       include: {
@@ -377,32 +377,40 @@ export const bankingService = {
       },
     });
 
-    // Get transaction counts for all accounts in one query
-    const transactionCounts = await prisma.transaction.groupBy({
+    // Get transaction counts and sums for all accounts in one query
+    const transactionStats = await prisma.transaction.groupBy({
       by: ["accountId"],
       _count: {
         id: true,
       },
+      _sum: {
+        amount: true,
+      },
     });
 
     const countMap = new Map<string, number>();
-    transactionCounts.forEach((tc) => {
-      countMap.set(tc.accountId, tc._count.id);
+    const balanceMap = new Map<string, number>();
+    transactionStats.forEach((ts) => {
+      countMap.set(ts.accountId, ts._count.id);
+      balanceMap.set(ts.accountId, ts._sum.amount || 0);
     });
 
-    return accounts.map((a): Account & { transactionCount: number } => ({
-      id: a.id,
-      name: a.name,
-      bankId: a.bankId,
-      accountNumber: a.accountNumber,
-      type: a.type as Account["type"],
-      folderId: a.folderId,
-      balance: a.balance,
-      initialBalance: a.initialBalance,
-      currency: a.currency,
-      lastImport: a.lastImport,
-      externalUrl: a.externalUrl,
-      transactionCount: countMap.get(a.id) || 0,
-    }));
+    return accounts.map(
+      (a): Account & { transactionCount: number; calculatedBalance: number } => ({
+        id: a.id,
+        name: a.name,
+        bankId: a.bankId,
+        accountNumber: a.accountNumber,
+        type: a.type as Account["type"],
+        folderId: a.folderId,
+        balance: a.balance,
+        initialBalance: a.initialBalance,
+        currency: a.currency,
+        lastImport: a.lastImport,
+        externalUrl: a.externalUrl,
+        transactionCount: countMap.get(a.id) || 0,
+        calculatedBalance: balanceMap.get(a.id) || 0,
+      }),
+    );
   },
 };