Delete row sig_a8cb7151e9d0 from signals

id sig_a8cb7151e9d0
event_id evt_89bd21f2b9aa
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5427146 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:38:40Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-09T20:38:40.458758+00:00
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