Delete row sig_9807ca647906 from signals

id sig_9807ca647906
event_id evt_07043ec7d443
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6785383 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-08T00:15:34Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-11T00:15:34.341248+00:00
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