Delete row sig_66a00a53d6b2 from signals

id sig_66a00a53d6b2
event_id evt_01c4c4a95308
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5093531 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:40:08Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T20:40:08.728332+00:00
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