Delete row sig_ae8b274afaf1 from signals

id sig_ae8b274afaf1
event_id evt_c764cf79c4f0
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5564036 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:19:03Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-17T20:19:03.225149+00:00
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