feat: add API endpoints for positions, close, close-all, pnl, plus DB persistence before goroutine

trader.go

@@ -337,6 +337,51 @@ func (t *Trader) Start() {
 	log.Println("[Trader] ▶ Trading RESUMED")
 }
 
+// ClosePosition closes a single position by coin name.
+func (t *Trader) ClosePosition(coin string) error {
+	t.mu.Lock()
+	pos, ok := t.positions[coin]
+	t.mu.Unlock()
+	if !ok {
+		return fmt.Errorf("no open position for %s", coin)
+	}
+	if pos.Status != "open" && pos.Status != "close_failed" {
+		return fmt.Errorf("position %s is in status %s, cannot close", coin, pos.Status)
+	}
+	t.closeBothLegs(pos)
+	pos.Status = "closed"
+	pos.ExitedAt = time.Now()
+	t.mu.Lock()
+	delete(t.positions, coin)
+	t.mu.Unlock()
+	log.Printf("[Trader] Manually closed %s %s", coin, pos.Direction)
+	return nil
+}
+
+// CloseAllPositions closes every open position.
+func (t *Trader) CloseAllPositions() int {
+	t.mu.Lock()
+	positions := make([]*ArbPosition, 0, len(t.positions))
+	for _, pos := range t.positions {
+		positions = append(positions, pos)
+	}
+	t.mu.Unlock()
+	count := 0
+	for _, pos := range positions {
+		if pos.Status == "open" || pos.Status == "close_failed" {
+			t.closeBothLegs(pos)
+			pos.Status = "closed"
+			pos.ExitedAt = time.Now()
+			t.mu.Lock()
+			delete(t.positions, pos.Coin)
+			t.mu.Unlock()
+			log.Printf("[Trader] Force-closed %s %s", pos.Coin, pos.Direction)
+			count++
+		}
+	}
+	return count
+}
+
 // Tick is called every scanner cycle — checks scaling and exit.
 func (t *Trader) Tick(store *PriceStore, notifier *Notifier) {
 	if !t.IsConfigured() {