add daily expense sums endpoint and optimize indexes for queries

src/controllers/expenses.js

@@ -297,12 +297,58 @@ const expensesBreakdown = async (req, res) => {
     }
 };
 
+// Return daily expense sums within a date range
+const expensesDaily = async (req, res) => {
+    if (!req.query.startDate) {
+        return res.status(400).json({
+            message: "Start date must be present!"
+        });
+    }
+
+    if (!req.query.endDate) {
+        return res.status(400).json({
+            message: "End date must be present!"
+        });
+    }
+
+    const filterObject = {
+        accountID: req.params.aid,
+        date: {
+            $gte: new Date(req.query.startDate),
+            $lte: new Date(req.query.endDate)
+        }
+    };
+
+    try {
+        const pipeline = [
+            { $match: filterObject },
+            {
+                $group: {
+                    _id: { $dateToString: { format: "%Y-%m-%d", date: "$date" } },
+                    total: { $sum: "$amount" }
+                }
+            },
+            { $project: { _id: 0, date: "$_id", total: 1 } },
+            { $sort: { date: 1 } }
+        ];
+
+        const daily = await Expense.aggregate(pipeline).option({ allowDiskUse: true });
+
+        res.status(200).json(daily);
+    } catch (error) {
+        res.status(500).send({
+            message: error.message || "An error occurred while fetching daily expenses!"
+        });
+    }
+};
+
 export default {
     findAllExpensesByAccountID,
     findExpenseByID,
     findExpenseFileByID,
     create,
     remove,
     update,
-    expensesBreakdown
+    expensesBreakdown,
+    expensesDaily,
 }

src/models/expenses.js

@@ -58,6 +58,9 @@ let expense = new Schema({
         timestamps: true
     });
 
+// Compound index to optimize account-scoped date queries and sorted pagination
+expense.index({ accountID: 1, date: -1, _id: -1 });
+
 
 // validate category1 with array of allowed categories1
 function validateCategory1(category) {

src/models/incomes.js

@@ -30,6 +30,9 @@ const income = new Schema({
         timestamps: true
     });
 
+// Compound index to optimize account-scoped date queries and sorted pagination (latest first)
+income.index({ accountID: 1, date: -1, _id: -1 });
+
 
 // Validate category1 with array of allowed categories1
 function validateCategory1(category) {

src/routes/expenses.js

@@ -42,6 +42,9 @@ router.put("/:id", [authJWT.verifyTokenWhitelist, authJWT.verifyTokenExpense, dr
 // Return expense breakdown by primary categories
 router.get("/breakdown/:aid", [authJWT.verifyTokenWhitelist, authJWT.verifyTokenAccount], expensesController.expensesBreakdown);
 
+// Return daily expense sums in date range
+router.get("/daily/:aid", [authJWT.verifyTokenWhitelist, authJWT.verifyTokenAccount], expensesController.expensesDaily);
+
 // Create sms expense draft
 router.post("/sms", [authJWT.verifyTokenWhitelist, drafts.createExpenseSMS], expensesController.create);