Delete row sig_d9f0aa0899f3 from signals

id sig_d9f0aa0899f3
event_id evt_d4d228493596
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7432659 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T20:35:26Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-10T20:35:26.256996+00:00
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