Operator Login
OTP is handled by Firebase Phone Authentication (safer for a static site).
reCAPTCHA
Make sure your hosting domain is added to Firebase Auth “OAuth redirect domains”. Firebase explains this in the phone auth guide. :contentReference[oaicite:0]{index=0}
Add / Update Member
Search
Fast path is exact number (document id). Name search is “contains” and can be slow on large databases.
Expiring (custom range style)
This mirrors your Unity logic: start date = today minus 2 months, end date = your input, filtered by membership type.