Delete row sig_3c39f78ba7eb from signals

id sig_3c39f78ba7eb
event_id evt_1363b66df4b7
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":374,"confidence":0.5964282 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T21:09:14Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T21:09:14.958002+00:00
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