Add forwarding history sync from lnd to db

db.go

@@ -69,3 +69,65 @@ func registerPayment(destination, paymentHash, paymentSecret []byte, incomingAmo
 	}
 	return nil
 }
+
+func insertChannel(chanID uint64, channelPoint string, nodeID []byte) error {
+	_, err := pgxPool.Exec(context.Background(),
+		`INSERT INTO
+	channels (chanis, channel_point, nodeid)
+	VALUES ($1, $2, $3)`,
+		chanID, channelPoint, nodeID)
+	if err != nil {
+		return fmt.Errorf("insertChannel(%v, %s, %x) error: %w",
+			chanID, channelPoint, nodeID, err)
+	}
+	return nil
+}
+
+func lastForwardingEvent() (int64, error) {
+	var last int64
+	err := pgxPool.QueryRow(context.Background(),
+		`SELECT coalesce(MAX("timestamp"), 0) AS last FROM forwarding_history`).Scan(&last)
+	if err != nil {
+		return 0, err
+	}
+	return last, nil
+}
+
+func insertForwardingEvents(rowSrc pgx.CopyFromSource) error {
+
+	tx, err := pgxPool.Begin(context.Background())
+	if err != nil {
+		return fmt.Errorf("pgxPool.Begin() error: %w", err)
+	}
+	defer tx.Rollback(context.Background())
+
+	_, err = tx.Exec(context.Background(), `
+	CREATE TEMP TABLE tmp_table ON COMMIT DROP AS
+		SELECT *
+		FROM forwarding_history
+		WITH NO DATA;
+	`)
+	if err != nil {
+		return fmt.Errorf("CREATE TEMP TABLE error: %w", err)
+	}
+
+	count, err := tx.CopyFrom(context.Background(),
+		pgx.Identifier{"tmp_table"},
+		[]string{"timestamp", "chanid_in", "chanid_out", "amt_msat_in", "amt_msat_out"}, rowSrc)
+	if err != nil {
+		return fmt.Errorf("CopyFrom() error: %w", err)
+	}
+	log.Printf("count1: %v", count)
+
+	cmdTag, err := tx.Exec(context.Background(), `
+	INSERT INTO forwarding_history
+		SELECT *
+		FROM tmp_table
+	ON CONFLICT DO NOTHING
+	`)
+	if err != nil {
+		return fmt.Errorf("INSERT INTO forwarding_history error: %w", err)
+	}
+	log.Printf("count2: %v", cmdTag.RowsAffected())
+	return tx.Commit(context.Background())
+}