Delete row sig_0a83ebe51987 from signals

id sig_0a83ebe51987
event_id evt_a737cf21ee68
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5715764 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T22:04:14Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-17T22:04:14.081082+00:00
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