Delete row sig_39e5f5c916be from signals

id sig_39e5f5c916be
event_id evt_c2f759068c41
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5317358 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T21:15:46Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-03T21:15:46.445253+00:00
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