Delete row sig_b8b47d3e32ce from signals

id sig_b8b47d3e32ce
event_id evt_72fee6743097
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5824414 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:03:00Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-21T20:03:00.836676+00:00
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