implemenation for mysql storage

[mattn]

• need to fix tag operations

[mattn]

Works fine for me.

$ nak event -t p=hoge -t e=moge -c "ほげほげ" ws://127.0.0.1:7447
{"id":"00cc8368a849a64b65263947e61c33fabebf48867b21c3a8db84d037702a3546","pubkey":"79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798","created_at":1698066305,"kind":1,"tags":[["p","hoge"],["e","moge"]],"content":"hello from the nostr army knife","sig":"fddb15819d3c4415876592be7dd517cfa19fed4676324c0950ff0d4ca66f8fb030872f76761adbdefbcf31ef197d006cd0905d2864dbcc22b6dd3a15039f3f9a"}
publishing to ws://127.0.0.1:7447... success.

$ nak req -t e=moge ws://127.0.0.1:7447
{"id":"1a77fe08239ff54293b84f03f4a94d1763548dc5d946ae0bc9b8ef4b4d9adb1a","pubkey":"79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798","created_at":1698066316,"kind":1,"tags":[["p","hoge"],["e","moge"]],"content":"ほげほげ","sig":"1f2e058ead34119806ab13048f5ad27aed42a6bb78a4e5e494fb6dce9fd6df55496c7a83dca4ba2636c54d9f6962260570fcade46d0ca2f2c0805435ebd3bd7e"}

[mattn]

deleting

$ nak event -k 5 -e 1a77fe08239ff54293b84f03f4a94d1763548dc5d946ae0bc9b8ef4b4d9adb1a ws://127.0.0.1:7447
{"id":"1bfec8ad240fa51b72442df64b17a1cedbaf6461d374fe9b0e50a1b0fcd27eb3","pubkey":"79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798","created_at":1698066942,"kind":5,"tags":[["e","00cc8368a849a64b65263947e61c33fabebf48867b21c3a8db84d037702a3546"]],"content":"hello from the nostr army knife","sig":"50cec4c70547f15a11b08c2e150361932206fa2dc780b43ea34a03f4731b4e6586996d46c8946e68a1ca6cf19990da47ba2c4b9b67a7488b2d59b2e611604430"}
publishing to ws://127.0.0.1:7447... sent.

$ nak req -t e=moge ws://127.0.0.1:7447

[isaqueveras]

Suggested change

	err := rows.Scan(&evt.ID, &evt.PubKey, &timestamp,
	&evt.Kind, &evt.Tags, &evt.Content, &evt.Sig)
	if err != nil {
	if err := rows.Scan(&evt.ID, &evt.PubKey, &timestamp,
	&evt.Kind, &evt.Tags, &evt.Content, &evt.Sig); err != nil {

[mattn]

I prefer to keep this because this line already too long.