feat: delete forwarded packet when it is not needed anymore

modules/apps/transfer/keeper/forwarding.go

@@ -49,7 +49,11 @@ func (k Keeper) acknowledgeForwardedPacket(ctx sdk.Context, packet channeltypes.
 		return errorsmod.Wrap(channeltypes.ErrChannelCapabilityNotFound, "module does not own channel capability")
 	}
 
-	return k.ics4Wrapper.WriteAcknowledgement(ctx, capability, packet, ack)
+	if err := k.ics4Wrapper.WriteAcknowledgement(ctx, capability, packet, ack); err != nil {
+		return err
+	}
+
+	return k.deleteForwardedPacket(ctx, packet.SourcePort, packet.SourceChannel, packet.Sequence)
 }
 
 // revertForwardedPacket reverts the logic of receive packet that occurs in the middle chains during a packet forwarding.

modules/apps/transfer/keeper/keeper.go

@@ -328,3 +328,16 @@ func (k Keeper) GetForwardedPacket(ctx sdk.Context, portID, channelID string, se
 
 	return storedPacket, true
 }
+
+// deleteForwardedPacket deletes the forwarded packet from the store.
+func (k Keeper) deleteForwardedPacket(ctx sdk.Context, portID, channelID string, sequence uint64) error {
+	store := ctx.KVStore(k.storeKey)
+	packetKey := types.PacketForwardKey(portID, channelID, sequence)
+	if !store.Has(packetKey) {
+		return fmt.Errorf("packet with PortID %s, channelID %s and sequence %d not found in the store", portID, channelID, sequence)
+	}
+
+	store.Delete(packetKey)
+
+	return nil
+}