Delete row sig_b0eff5181457 from signals

id sig_b0eff5181457
event_id evt_bb9b83cd2eb8
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":419,"confidence":0.6420617 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:02:53Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-09T20:02:53.519133+00:00
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