Delete row sig_538b70902cc3 from signals

id sig_538b70902cc3
event_id evt_26febe4f4c90
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5110662 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T21:14:11Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T21:14:11.421155+00:00
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