db: Add channel_id and type to the transactions table

Mainly used to differentiate channel-related transactions from on-chain wallet
transactions. Will be used to filter `listtransaction` results and bundle
transactions that belong to the same channel.

Signed-off-by: Christian Decker <decker.christian@gmail.com>

wallet/db.c

@@ -385,6 +385,13 @@ static struct migration dbmigrations[] = {
 	/* remote signatures for channel announcement */
 	{ "ALTER TABLE channels ADD remote_ann_node_sig BLOB;", NULL },
 	{ "ALTER TABLE channels ADD remote_ann_bitcoin_sig BLOB;", NULL },
+	/* Additional information for transaction tracking and listing */
+	{ "ALTER TABLE transactions ADD type INTEGER;", NULL },
+	/* Not a foreign key on purpose since we still delete channels from
+	 * the DB which would remove this. It is mainly used to group payments
+	 * in the list view anyway, e.g., show all close and htlc transactions
+	 * as a single bundle. */
+	{ "ALTER TABLE transactions ADD channel_id INTEGER;", NULL},
 };
 
 /* Leak tracking. */