CLAUDE.md: pre-move SQLite copy removed from the server; the old August backup script was never scheduled

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CLAUDE.md

@@ -125,7 +125,7 @@ API docs: Swagger `/api/docs/`, Redoc `/api/redoc/`, admin `/admin/`.
 
 **Structured logging**: `config.middleware.APIRequestLoggingMiddleware` (last in `MIDDLEWARE`, closest to the view) logs every `/api/` request as JSON (method/path/status/duration/user, no body/headers/secrets) via `config/log_formatters.py`.
 
-**Postgres** is the server's DB since 2026-10-08 (own cluster `14/zareian`, port 5440, localhost only; DB `zareian_mathapp`, role `zareian_app`; selected by `DB_NAME`/`DB_USER`/`DB_PASSWORD`/`DB_HOST`/`DB_PORT` in `.env`; passwords in `~/mathapp-v2/.pg_password`, `.redis_password`). It is separate from the company's `main` cluster on 5432 — never touch that. Without `DB_NAME` the app falls back to SQLite (local dev, tests); both run the full suite green. Data was moved with `dumpdata`/`loaddata`; model-count comparison matched. Guards that relied on SQLite's `IMMEDIATE` now rely on real row locks; concurrency tests pass on Postgres, not load-tested. `deploy.sh` backs up with `pg_dump -Fc` (restore into a scratch DB not tested). Operator guide: `~/Desktop/گزارشات Tadrisino/گزارش-۲۹/راهنمای-Postgres-و-Redis.html`. The old `db.sqlite3` stays on the server as a frozen pre-move copy.
+**Postgres** is the server's DB since 2026-10-08 (own cluster `14/zareian`, port 5440, localhost only; DB `zareian_mathapp`, role `zareian_app`; selected by `DB_NAME`/`DB_USER`/`DB_PASSWORD`/`DB_HOST`/`DB_PORT` in `.env`; passwords in `~/mathapp-v2/.pg_password`, `.redis_password`). It is separate from the company's `main` cluster on 5432 — never touch that. Without `DB_NAME` the app falls back to SQLite (local dev, tests); both run the full suite green. Data was moved with `dumpdata`/`loaddata`; model-count comparison matched. Guards that relied on SQLite's `IMMEDIATE` now rely on real row locks; concurrency tests pass on Postgres, not load-tested. `deploy.sh` backs up with `pg_dump -Fc` before `migrate`; the off-site live copy is in «بکاپ: کپیِ زنده» below. Operator guide: `~/Desktop/گزارشات Tadrisino/گزارش-۲۹/راهنمای-Postgres-و-Redis.html`. The pre-move `db.sqlite3` and migration dumps were deleted from the server; no SQLite file is left there.
 
 **SMS** goes through Kavenegar (`KAVENEGAR_API_KEY`/`KAVENEGAR_SENDER`); failures return explicit 503, not a fake success.
 
@@ -467,6 +467,7 @@ anyone who can read this repo can forge a token for any user.**
   ۲ ثانیه بعد در بازیابیِ ۲۴۷ بود (جدولش پاک شد). **نسنجیده:** ری‌بوتِ ۲۴۷، قطعیِ طولانی تا `lost`، اجرای خودکارِ timer
   (اولین بار ۲۰۲۶-۱۰-۱۱ ۰۴:۳۰)، و برگرداندنِ بازیابی روی خودِ ۲۴۹.
 - ایمیجِ روزانه‌ی کلِ ماشین کارِ ادمینِ سرور است؛ محتوایش را ما نسنجیده‌ایم. کپیِ ما به آن تکیه نمی‌کند.
+- «بکاپِ خودکارِ قبلی روی ۲۴۷» وجود نداشت: `~/backup_mathapp.sh`ِ ۲۴۹ (کپیِ SQLite و journal با scp) فقط ۲۰۲۶-۰۸-۲۹ دستی اجرا شده و در هیچ cron/timerی نیست. خودش و خروجی‌هایش (`~/backups/` روی ۲۴۹، `~/backups/mathapp/` روی ۲۴۷) مرده‌اند؛ پاک کردنشان بیرون از `~/mathapp-v2` است و اجازه‌ی جدا می‌خواهد.
 
 ## اشتراک و دیوارِ پرداخت — روی سرور از ۲۰۲۶-۱۰-۱۰ ۰۱:۱۹ (بک‌اند `64c4c09`، فرانت `a8a5351`)