Delete row sig_0e8adaf50b66 from signals

id sig_0e8adaf50b66
event_id evt_9e9ad9a2753e
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5860579 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T20:40:18Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-10T20:40:18.683446+00:00
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