Delete row sig_5416e8ebbc90 from signals

id sig_5416e8ebbc90
event_id evt_0846c90cce4b
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5937859 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T22:14:17Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-17T22:14:17.525175+00:00
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