feat: support mysql and postgresql database

src/main/kotlin/cn/rtast/fancybot/db/ActionTable.kt

@@ -10,10 +10,10 @@ package cn.rtast.fancybot.db
 import org.jetbrains.exposed.sql.Table
 
 object ActionTable : Table("action") {
-    val id = integer("id").autoIncrement().nullable()
-    val action = varchar("action", 255).nullable()
-    val timestamp = long("timestamp").nullable()
-    val triggerId = long("trigger_id").nullable()
-    val result = varchar("result", 255)
+    val id = integer("id").autoIncrement()
+    val action = varchar("action", 255)
+    val timestamp = long("timestamp")
+    val triggerId = long("trigger_id")
+    val result = text("result")
     override val primaryKey = PrimaryKey(id)
 }