Delete row sig_3ab9180abce5 from signals

id sig_3ab9180abce5
event_id evt_8271a03665ea
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5069328 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-15T01:04:54Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-18T01:04:54.221277+00:00
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