Cédric Marcoux 2781b21a89 feat: built-in XC catch-up (timeshift) support ...

Adds native catch-up/timeshift replay for Xtream Codes providers through
the same HTTPStreamReader transport pipeline as live TV.

Timeshift proxy (apps/timeshift/):
- URL cascade: 3 candidate timestamp formats per provider, per-account
  format cache for fast-forward seek performance
- MPEG-TS preamble stripping (shared with HTTPStreamReader)
- Stats integration: timeshift viewers appear on /stats with TIMESHIFT badge
- Auth via hmac.compare_digest on XC password

Catchup detection — denormalized for zero-cost output queries:
- Stream.is_catchup + Stream.catchup_days populated at XC import time
- Channel.has_catchup + Channel.catchup_days + Channel.catchup_provider_stream_id
  rolled up via ChannelStream post_save signal (UI path) and explicit SQL
  after bulk_create (import path)
- _xc_channel_entry() reads denormalized fields instead of per-channel
  custom_properties JSON introspection (eliminates N+1 queries)
- Migration 0038 backfills existing data via raw SQL

XC API enhancements:
- server_info.timezone + start/end + time_now use configured timezone
  (triple consistency rule — fixes wrong-programme-plays bug)
- Dynamic has_archive flag + auto prev_days for catch-up channels
- XMLTV timestamps rewritten to local timezone for catch-up clients

HTTPStreamReader extended (apps/proxy/live_proxy/input/http_streamer.py):
- 1 MB pipe buffer via fcntl F_SETPIPE_SZ (eliminates producer/consumer
  ping-pong that halved throughput)
- Pre-opened response= for URL cascade workflows
- strip_ts_preamble= for XC servers emitting PHP warnings before TS
- find_ts_sync() as shared utility
- Builds on upstream O_NONBLOCK + select() write loop

Provider stream_id lookup order:
- stream_xc() and xc_get_epg() try internal Channel.id first, fall back
  to provider stream_id only when needed (avoids unconditional query on
  every request)

Also includes:
- VOD provider cascade in stream_vod() — iterates all M3U relations by
  priority when first provider is at capacity
- Defensive null-safety: custom_sid: None → "" in get_live_streams,
  get_vod_streams, get_vod_info, get_series_info (fixes iPlayTV crash on
  JSON null for string fields)
- Timeshift settings UI (timezone selector, debug toggle)
- StreamConnectionCard violet TIMESHIFT badge
- Orphan cleanup skips timeshift_* virtual channels

2026-05-27 13:13:20 +02:00

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