feat(cron): simplify to single expression — 00:00 + hourly 05-23 UTC+7

cloudflare-worker/wrangler.toml

@@ -11,22 +11,12 @@ TZ = "Asia/Ho_Chi_Minh"
 
 # Cron triggers fire from this list. CF Workers requires literal cron
 # expressions here — they cannot be loaded from env vars or secrets.
-# Schedule (Asia/Ho_Chi_Minh, UTC+7) — 20 fires/day, packed into 5 expressions:
-#   00:00         — once at local midnight
-#   05:01-09:01   — every hour, minute 01
-#   10:02-14:02   — every hour, minute 02
-#   15:03-19:03   — every hour, minute 03
-#   20:04-23:04   — every hour, minute 04
-# Crons evaluate in UTC, so each row is offset by -7 hours; the 05-09 row
-# wraps midnight UTC so it uses a comma list rather than a range.
-# Free tier allows up to 5 cron expressions per worker — at limit.
+# Schedule (Asia/Ho_Chi_Minh, UTC+7): hourly at :00 from 05:00 to 23:00,
+# plus a single fire at 00:00 — 20 fires/day, every hour except 01-04.
+# Crons evaluate in UTC; UTC+7 hours {00, 05..23} map to UTC {17, 22-23, 0-16}.
 [triggers]
 crons = [
-  "0 17 * * *",          # 00:00 UTC+7  (17:00 UTC prev day)
-  "1 22,23,0,1,2 * * *", # 05:01-09:01 UTC+7
-  "2 3-7 * * *",         # 10:02-14:02 UTC+7
-  "3 8-12 * * *",        # 15:03-19:03 UTC+7
-  "4 13-16 * * *",       # 20:04-23:04 UTC+7
+  "0 0-17,22-23 * * *", # UTC+7: 00:00 + 05:00..23:00 hourly
 ]
 
 # Built-in observability (free tier supports basic logs).