2026-08-04 Fable 5 QA audit. Three batches sharing one test file, all
verified by runnable repros before fixing, all gated below.
Batch C — telegram alert delivery (verified by h4 harness):
- Failed breach rescan shrinks the cooldown to 30 s instead of
silencing the symbol for 5 min; breach during cooldown is PARKED and
fired on the first tick after expiry (was dropped forever).
- Level cache keyed symbol→TF (M5 scans no longer wipe H1/H4 swing
levels within minutes); breach labels TF-qualified.
- Markdown alert sends get a plain-text fallback (mirroring _safe_edit);
fingerprint commits only when a message actually landed.
- Per-key asyncio.Lock closes the dedup TOCTOU between auto-scan and
breach sends (forced-interleave repro produced duplicate alerts).
- _start_scheduler respawns dead per-TF loops (was all-or-nothing).
- Clean WS close now backs off (was a zero-delay reconnect hot loop);
backoff resets only after a connection that received ticks; TD
iter_ticks fires on_connect on the first RECEIVED frame (invalid key
can no longer pin the backoff at minimum).
- Scan-failure logs carry the real traceback (was "NoneType: None").
Batch E — providers (verified by h5 harness):
- fetch_range: 3 consecutive chunk ERRORS raise instead of returning
silently truncated history (verified 731-day silent gap repro; also
covers 429 storms); pagination no-progress guard; head-truncation
ERROR log.
- Single-flight per (symbol,TF): 4 concurrent scans = 1 API call (was
4); cache records requested depth so a longer-lookback call refetches.
- Multi-bar forming/future tail fully dropped (was iloc[:-1] once).
- Oanda: malformed candles skipped, never 0.0-defaulted; cleaning drops
non-positive-price rows BEFORE OHLC repair; inf returns neutralized so
one corrupt bar can no longer disarm the whole 10-sigma filter.
Batch F — backtester internals (verified by h6 harness):
- NaN bar in a trailing window exits at the last valid bar (was NaN R
poisoning every metric); static-path TIMEOUT NaN guard;
compute_metrics excludes non-finite R loudly. Zero real-data exposure
(0 NaN rows in all 10 Oanda parquets) — defensive.
- fetch_history ERROR-logs pre-2026-07-08 cache files (cleaned-bars era)
when loaded for raw-path resolution.
Gates: suite 333/333 green; pinned M15 12mo book reproduced identically
(397 trades, +78.7111R) after E and after F; M5 HEAD-config baseline
reproduced identically (556 trades, +97.5604R) after F.
Claude-Session: https://claude.ai/code/session_01UnZkzeFcTu9agFg8BDh2tn
The monitor has been dead since the Oanda feed switch (Oanda's provider
does not stream). New config.json scalar data_providers.streaming selects
a tick-stream provider independent of the candle feed; telegram_bot
resolves it via _get_streaming_dp() (separate instance, candle cache
stays on the active provider) and falls back to the active provider when
unset — behavior is byte-identical to before when the key is absent.
TiingoDataProvider grows the two sanctioned streaming overrides:
supports_streaming=True and iter_ticks() on wss://api.tiingo.com/fx
(mid price only — the no-spread rule extends to the stream). Two
deliberate divergences from the TD reference implementation, both
because Tiingo authenticates inside the socket: server "E" messages
raise TiingoDataError (a swallowed auth error would end the generator
cleanly and reconnect-hammer with zero backoff), and on_connect fires on
the first received message rather than after the subscribe send. Field
order of quote frames was live-verified: ask is data[7], not data[6] as
the docs table suggests (data[6] is askSize).
make_data_provider(config, name=None) now takes an explicit provider
name; keyless streaming providers disable the monitor with one warning
instead of a traceback-per-minute loop.
Tests 266 → 273 (WS parser, ticker round-trip, streaming config scalar,
explicit-name dispatch, streaming-dp resolution, monitor auto-disable).
Claude-Session: https://claude.ai/code/session_01Nsd8HcrV67GbCZXxZEn1Ma
One class per provider (TwelveData, Oanda, Tiingo), all subclassing
BaseDataProvider which owns cache, validation/cleaning, freshness +
boundary guarantees, fetch_range pagination, and streaming stubs —
subclasses implement only _fetch_raw. config.json data_providers.active
selects the live feed; data_provider.py / oanda_provider.py stay as
back-compat shims. Module 16 provider-abstraction tests (253 total green).
Claude-Session: https://claude.ai/code/session_01Mc7XKYyPySVXiUpcN82QEK
Harwinder Sekhon