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walkthroughs/2026-04-18_00f20fb7_Walkthrough__PostgreSQL_Compatibility_Fixes.md

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+# Walkthrough - PostgreSQL Compatibility Fixes
+
+I have resolved the 500 Internal Server Error encountered when fetching dashboard data. The issue was caused by MySQL-specific SQL syntax in the backend controllers, which is incompatible with your PostgreSQL database.
+
+## Changes Made
+
+### Backend API
+
+#### 1. Statistics Controller Fix
+Updated [StatisticsController.php](file:///media/itc43/Data/OTHER_PROJECT/kulakpos/kulakpos_15Maret2026_to%20GTEA/public_html/app/Http/Controllers/Api/StatisticsController.php) to use PostgreSQL's `TO_CHAR` function and **double-quoted camelCase column names** like `"totalAmount"`.
+
+**Before:**
+```php
+$sales_data = Sale::selectRaw("DATE_FORMAT(created_at, '%Y-%m-%d') as date, SUM(totalAmount) as amount")
+```
+
+**After:**
+```php
+$sales_data = Sale::selectRaw("TO_CHAR(created_at, 'YYYY-MM-DD') as date, SUM(\"totalAmount\") as amount")
+```
+
+#### 2. Report Controller Fix
+Updated [AcnooReportController.php](file:///media/itc43/Data/OTHER_PROJECT/kulakpos/kulakpos_15Maret2026_to%20GTEA/public_html/app/Http/Controllers/Api/AcnooReportController.php) to use the PostgreSQL cast operator `::date` and quoted camelCase columns (`"saleDate"`, `"lossProfit"`, etc.).
+
+**Example After:**
+```php
+DB::raw('"saleDate"::date as date')
+DB::raw('SUM("lossProfit") as total_sale_income')
+```
+
+#### 3. Other Database Compatibility Fixes
+- **Admin Dashboard:** Replaced `MONTHNAME()` with `TO_CHAR(..., 'Month')` in [DashboardController.php](file:///media/itc43/Data/OTHER_PROJECT/kulakpos/kulakpos_15Maret2026_to%20GTEA/public_html/app/Http/Controllers/Admin/DashboardController.php).
+- **Transfer Model:** Replaced `CAST(... AS UNSIGNED)` with `CAST(... AS INTEGER)` in [Transfer.php](file:///media/itc43/Data/OTHER_PROJECT/kulakpos/kulakpos_15Maret2026_to%20GTEA/public_html/app/Models/Transfer.php).
+
+## Verification Results
+
+### Manual Verification Required
+As the backend environment is restricted, please perform the following steps to verify the fix:
+1. Ensure your PostgreSQL database is running.
+2. Restart your Laravel development server: `php artisan serve`.
+3. Run your Flutter application and navigate to the dashboard.
+4. Verify that the "Failed to fetch business data 500" error no longer appears and that data is displayed correctly.