add remove command

src/main/kotlin/space/mori/chzzk_bot/services/CommandService.kt

@@ -1,6 +1,7 @@
 package space.mori.chzzk_bot.services
 
 import org.jetbrains.exposed.sql.SqlExpressionBuilder.eq
+import org.jetbrains.exposed.sql.and
 import org.jetbrains.exposed.sql.transactions.transaction
 import space.mori.chzzk_bot.models.Command
 import space.mori.chzzk_bot.models.Commands
@@ -17,6 +18,17 @@ object CommandService {
         }
     }
 
+    fun removeCommand(user: User, command: String): Command? {
+        return transaction {
+            val commandRow = Command.find(Commands.user eq user.id and(Commands.command eq command)).firstOrNull()
+
+            commandRow ?: throw RuntimeException("Command not found! $command")
+            commandRow.delete()
+
+            return@transaction commandRow
+        }
+    }
+
     fun getCommand(id: Int): Command? {
         return transaction {
             return@transaction Command.findById(id)