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Chunk parts > 19MB are stored to Telegram but getFile cannot resolve files over 20MB ('Bad Request: file is too big'), making every part undownloadable (prod bug 2026-08-01: 48MB chunk -> download 500).
- src/env.ts: reject TELEGRAM_CHUNK_SIZE_BYTES > 19922944 at startup (log error + throw), default changed 20MB -> 19MB
- src/shared/utils/validation.ts: TELEGRAM_CHUNK_SIZE_MAX_BYTES constant; asSafeChunkSize now enforces the max at runtime (covers S3 multipart parts too)
- test/env.test.ts: unit tests + subprocess fail-fast tests (48MB rejected, 19MB accepted)
- test/helpers/setup-env.ts: pin safe chunk size so a stale .env can't break the suite
- .env.example + CLAUDE.md: document the 20MB getFile limit
Tested actual Telegram Bot API limit:
- 49MB ✅
- 50MB ❌ (413 Request Entity Too Large)
Set TELEGRAM_CHUNK_SIZE_BYTES=50331648 (48MB) for safety
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
feat: add S3 bucket versioning support and related XML response handling
refactor: rename temporary file paths from 'teleuploader' to 'filedrop' for consistency
fix: update Swagger documentation to reflect new API name and descriptions
test: add unit tests for authentication routes and utilities
test: implement end-to-end tests for S3 bucket configuration and versioning
chore: update environment variable defaults for new service name
asepharyana