Delete row sig_9ac647b77c84 from signals

id sig_9ac647b77c84
event_id evt_b87dd3cd4451
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":152,"confidence":0.5704938 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T20:05:31Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-03T20:05:31.947835+00:00
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