feat: fix bug and useing sqlite to store data

src/main/kotlin/cn/rtast/fancybot/entity/SignTable.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright © 2024 RTAkland
+ * Author: RTAkland
+ * Date: 2024/8/30
+ */
+
+
+package cn.rtast.fancybot.entity
+
+import org.jetbrains.exposed.sql.Table
+
+object SignTable : Table("sign") {
+    val id = integer("id").autoIncrement()
+    val userId = long("userId").uniqueIndex()
+    val timestamp = long("timestamp")
+    val point = long("point")
+
+    override val primaryKey = PrimaryKey(id)
+}