[graph_channels] funding_tx_index is wrong

[gpBlockchain]

funding_tx_index: 0x0, but tx_index is 0x1

curl --location 'http://127.0.0.1:8231' --header 'Content-Type: application/json' --data '{
    "id": 42,
    "jsonrpc": "2.0",
    "method": "graph_channels",
    "params": [
        {
        }
    ]
}'
{"jsonrpc":"2.0","result":{"channels":[{"channel_outpoint":"0x0647f070650b6795379b4e570fd98c9584085d572a922f572c33add2311a7acd00000000","funding_tx_block_number":"0x36","funding_tx_index":"0x0","node1":"0215495bcfa1a2927ea98e2d0cd6ec09ca3aa058488dfef5693734114ff301375c","node2":"0384092f9a454e23e1965ea383ae99ce66540f8ce97fa8b9974c44071cb7a702b3","last_updated_timestamp":"0x192a572a9f8","created_timestamp":1729352608247,"node1_to_node2_fee_rate":"0x3e8","node2_to_node1_fee_rate":null,"capacity":"0x187e689c00","chain_hash":"0x0000000000000000000000000000000000000000000000000000000000000000","udt_type_script":null}],"last_cursor":"0x600647f070650b6795379b4e570fd98c9584085d572a922f572c33add2311a7acd00000000"},"id":42}

curl --location 'http://127.0.0.1:8114' --header 'Content-Type: application/json' --data '{
    "id": 42,
    "jsonrpc": "2.0",
    "method": "get_transaction",
    "params": ["0x0647f070650b6795379b4e570fd98c9584085d572a922f572c33add2311a7acd"]
}'
{"jsonrpc":"2.0","result":{"cycles":"0x33bcfd","fee":null,"min_replace_fee":null,"time_added_to_pool":null,"transaction":{"cell_deps":[{"dep_type":"dep_group","out_point":{"index":"0x0","tx_hash":"0xa611f41952574b8a200465b2281d17bc1196a878e31f206857ee3d20925d5795"}}],"hash":"0x0647f070650b6795379b4e570fd98c9584085d572a922f572c33add2311a7acd","header_deps":[],"inputs":[{"previous_output":{"index":"0x1","tx_hash":"0x8486c152208e14eb0d32b0e245e1dc6bcd29d6d40e8ef83da8e159d737f18609"},"since":"0x0"},{"previous_output":{"index":"0xe","tx_hash":"0x8924295bde0c8224f3e7324729e70121d91bac34ca763b8fd283905feb75b9fa"},"since":"0x0"}],"outputs":[{"capacity":"0x187e689c00","lock":{"args":"0x91bfef443b8f9cae01404a373c99ce2546dcbaa0","code_hash":"0x03ae445d1bec9930ba5d9c77a0c2110c0f7e5fa504e7343dc13d9aaa8649cfcb","hash_type":"data1"},"type":null},{"capacity":"0x1bc16d160cc29427","lock":{"args":"0xc8328aabcd9b9e8e64fbc566c4385c3bdeb219d7","code_hash":"0x9bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8","hash_type":"type"},"type":null},{"capacity":"0x736f6310aa09da1","lock":{"args":"0x470dcdc5e44064909650113a274b3b36aecb6dc7","code_hash":"0x9bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8","hash_type":"type"},"type":null}],"outputs_data":["0x","0x","0x"],"version":"0x0","witnesses":["0x550000001000000055000000550000004100000087bc7d45b3c0b6217ac45fc234f008139881f221c02b86717998038501bef7a3053ae1973e3f01909c63277d283b454b4fa9dc0ce190d7949a97ce53379c1dc401","0x5500000010000000550000005500000041000000da152673c9ff6adbe9e2c2332781da45b75b914503b0e715eb451125fcb3c1ee0af780c0ea0d87feb0f25ffe52049c920cb74702fa6793f15da1abac37bca26701"]},"tx_status":{"block_hash":"0x660b3c305fcca8e5b14596953eddb8fe0c5044fc609c79b84099011adca80ff3","block_number":"0x36","reason":null,"status":"committed","tx_index":"0x1"}},"id":42}

[contrun]

This is a known problem. We didn't return tx_index in the RPC until nervosnetwork/ckb#4583. I saved a "dummy" tx index (always 0) to the graph. The tx index was intended to be used by node while paginating channel information. Since we have already upgraded to 0.118 in #252 . We should be able to use real tx index now. But we need also to document our ckb node requirement.