Delete row sig_4ff0edf40aa1 from signals

id sig_4ff0edf40aa1
event_id evt_438cd9b98ae3
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.4987845 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T02:34:02Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T02:34:02.303080+00:00
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