// Position Close Karna
    public static function close_position( $user_id, $position_id ) {
        global $wpdb;

        $position = FXSim_Database::get_position( $position_id, $user_id );
        if ( ! $position ) {
            return new WP_Error( 'not_found', 'Position not found' );
        }

        $bid_ask = FXSim_Simulated_Feed::get_bid_ask( $position['symbol'] );
        if ( ! $bid_ask || empty($bid_ask['bid']) ) {
            return new WP_Error( 'no_price', 'Market price not available to close' );
        }

        $close_price = ( $position['position_type'] === 'buy' ) ? (float)$bid_ask['bid'] : (float)$bid_ask['ask'];
        
        // Calculate Final PnL
        $direction = ( $position['position_type'] === 'buy' ) ? 1 : -1;
        $price_diff = $direction * ( $close_price - (float)$position['open_price'] );
        
        $sym = FXSim_Database::get_symbol( $position['symbol'] );
        $contract = $sym ? (float)$sym['contract_size'] : 100000;
        
        $pnl = $price_diff * (float)$position['lot_size'] * $contract;
        $pnl = round( $pnl - (float)$position['commission'], 2 );

        // Move to Trades History (100% Safe Column Mapping)
        $trade_data = [
            'user_id'          => (int) $position['user_id'],
            'account_id'       => (int) $position['account_id'],
            'position_id'      => (int) $position['id'],
            'symbol'           => sanitize_text_field($position['symbol']),
            'position_type'    => sanitize_text_field($position['position_type']),
            'lot_size'         => (float) $position['lot_size'],
            'open_price'       => (float) $position['open_price'],
            'close_price'      => (float) $close_price,
            'commission'       => (float) $position['commission'],
            'pnl'              => (float) $pnl,
            'open_time'        => sanitize_text_field($position['open_time']),
            'close_time'       => current_time('mysql'),
            'duration_seconds' => abs(strtotime(current_time('mysql')) - strtotime($position['open_time'])),
            'close_reason'     => 'manual',
        ];
        
        $inserted = $wpdb->insert( FXSim_Database::table('trades'), $trade_data );

        // Delete from Open Positions ONLY if history is saved successfully
        if ($inserted) {
            $wpdb->delete( FXSim_Database::table('positions'), [ 'id' => $position_id ] );
        } else {
            // If insert fails, do not delete position! (Prevents trade loss)
            return new WP_Error( 'db_error', 'Failed to save trade history. Trade not closed.' );
        }

        // Update Account Balance
        $account = FXSim_Database::get_account_by_user( $user_id );
        $new_balance = (float) $account['balance'] + $pnl;
        $new_margin_used = (float) $account['margin_used'] - (float)$position['margin_required'];
        if($new_margin_used < 0) $new_margin_used = 0;

        FXSim_Database::update_account( $user_id, [
            'balance'     => $new_balance,
            'margin_used' => $new_margin_used,
            'free_margin' => $new_balance - $new_margin_used,
        ] );

        return [ 
            'success' => true, 
            'data' => [ 
                'pnl'         => $pnl, 
                'close_price' => $close_price 
            ] 
        ];
    }    public function get_account() {
        $user_id = get_current_user_id();
        $account = FXSim_Database::get_account_by_user( $user_id );
        
        if (!$account) {
            return new WP_REST_Response(['success' => false, 'message' => 'Account not found'], 404);
        }

        // Direct Database values (Safe from Pricing Engine Errors)
        $balance = (float) $account['balance'];
        $margin_used = (float) $account['margin_used'];
        $equity = $balance; // We will add live PnL here later
        $free_margin = (float) $account['free_margin'];

        return new WP_REST_Response([
            'success'        => true,
            'balance'        => $balance,
            'equity'         => $equity,
            'margin_used'    => $margin_used,
            'free_margin'    => $free_margin,
            'margin_level'   => $margin_used > 0 ? ($equity / $margin_used) * 100 : 0,
            'account_number' => $account['account_number'] ?? 'N/A',
            'leverage'       => (int) $account['leverage'] ?? 100,
        ], 200 );
    }<?xml version="1.0" encoding="UTF-8"?>
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