feat: add room management functionality

db/queries/room.sql

@@ -18,7 +18,7 @@ RETURNING *;
 
 -- name: UpdateRoom :one
 UPDATE rooms
-SET name = coalesce(sqlc.arg(name), name),
+SET name = CASE WHEN sqlc.arg(name) = '' THEN name ELSE sqlc.arg(name) END,
     description = coalesce(sqlc.arg(description), description),
     updated_at = sqlc.arg(updated_at)
 WHERE id = sqlc.arg(id)