Tiingo WebSocket streaming: re-enable the level-breach monitor

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).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Nsd8HcrV67GbCZXxZEn1Ma

telegram_bot.py

@@ -12,7 +12,9 @@ Auto-scan:   Starts automatically on boot if TELEGRAM_CHAT_ID is set.
              M15 fires at :00/:15/:30/:45 + 10s buffer.
              H1  fires at :00 + 10s buffer.
              H4  fires at :00 every 4 hours + 10s buffer.
-WebSocket:   Streams live ticks from TwelveData for XAU/USD.
+WebSocket:   Streams live ticks from the streaming provider — config.json
+             `data_providers.streaming` when set (e.g. tiingo), else the
+             active provider if it streams; auto-disabled otherwise.
              When price crosses a key structure level (swing S/R, BB,
              EMA200) cached from the last boundary scan, triggers an
              immediate M15 scan and sends a Level Break Alert.
@@ -203,6 +205,27 @@ def _get_shared_dp() -> BaseDataProvider:
     return _shared_dp
 
 
+_streaming_dp: Optional[BaseDataProvider] = None
+
+
+def _get_streaming_dp() -> BaseDataProvider:
+    """Provider for the tick stream: config.json data_providers.streaming
+    when set (a SEPARATE instance — the candle cache stays on the active
+    provider), else the shared active provider. Reads app config at call
+    time, not the import-time _APP snapshot, so tests can swap it via
+    set_app_config()."""
+    global _streaming_dp
+    if _streaming_dp is None:
+        app = get_app_config()
+        if app.streaming_provider is None or \
+                app.streaming_provider == app.active_provider:
+            _streaming_dp = _get_shared_dp()
+        else:
+            _streaming_dp = make_data_provider(
+                PlatformConfig(), app.streaming_provider)
+    return _streaming_dp
+
+
 # ── Signal formatting ─────────────────────────────────────────────────
 
 _SIGNAL_EMOJI = {
@@ -755,12 +778,19 @@ async def _ws_monitor(bot) -> None:
     """Level-breach tick monitor. The provider owns the connection and
     protocol (`iter_ticks`); this loop owns reconnect/backoff and breach
     dispatch. Providers without streaming quotes simply disable it."""
-    dp = _get_shared_dp()
+    dp = _get_streaming_dp()
     if not dp.supports_streaming:
         logger.info(
             "Data provider %r has no streaming quotes — "
             "level-breach monitor disabled", dp.name)
         return
+    if getattr(dp, "_api_key", "unused") is None:
+        # Guard, not a traceback loop: without a key every connect
+        # attempt would raise and re-log a full traceback every ≤60s.
+        logger.warning(
+            "Streaming provider %r has no API key — "
+            "level-breach monitor disabled", dp.name)
+        return
 
     backoff = 1
     while _feed_active():
@@ -951,7 +981,8 @@ def _status_text() -> str:
         lines.append(f"📢 Channel feed: *on* (`{CHANNEL_ID}`)")
 
     if _ws_task and not _ws_task.done():
-        lines.append("📡 WebSocket: *connected*")
+        provider = _streaming_dp.name if _streaming_dp else "?"
+        lines.append(f"📡 WebSocket: *connected* ({provider})")
     else:
         lines.append("❌ WebSocket: *disconnected*")