feat: support Polymarket by adding new exchange trade type

schema/metadata/exchange.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/rss3-network/protocol-go/schema"
 	"github.com/rss3-network/protocol-go/schema/typex"
+	"github.com/shopspring/decimal"
 )
 
 var _ Metadata = (*ExchangeSwap)(nil)
@@ -105,3 +106,34 @@ const (
 	ActionExchangeLoanLiquidate
 	ActionExchangeLoanSeize
 )
+
+var _ Metadata = (*ExchangeTrade)(nil)
+
+type ExchangeTrade struct {
+	Action            ExchangeTradeAction `json:"action"`
+	OrderHash         string              `json:"order_hash"`
+	Maker             string              `json:"maker"`
+	Taker             string              `json:"taker"`
+	MakerAssetID      uint64              `json:"maker_asset_id"`
+	TakerAssetID      uint64              `json:"taker_asset_id"`
+	MakerAmountFilled *decimal.Decimal    `json:"maker_amount_filled"`
+	TakerAmountFilled *decimal.Decimal    `json:"taker_amount_filled"`
+	Fee               *decimal.Decimal    `json:"fee,omitempty"`
+}
+
+func (e ExchangeTrade) Type() schema.Type {
+	return typex.ExchangeTrade
+}
+
+//go:generate go run --mod=mod github.com/dmarkham/enumer --values --type=ExchangeTradeAction --transform=snake --trimprefix=ActionExchangeTrade --output exchange_trade.go --json --sql
+type ExchangeTradeAction uint64
+
+//goland:noinspection GoMixedReceiverTypes
+func (t ExchangeTradeAction) Type() schema.Type {
+	return typex.ExchangeTrade
+}
+
+const (
+	ActionExchangeTradeFinalized ExchangeTradeAction = iota + 1
+	ActionExchangeTradeMatched
+)

schema/typex/exchange.go

@@ -20,4 +20,5 @@ const (
 	ExchangeStaking
 	ExchangeSwap
 	ExchangeLoan
+	ExchangeTrade
 )