Delete row sig_8f4571870270 from signals

id sig_8f4571870270
event_id evt_065af653eda5
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6592892 ...
threshold NULL
direction NULL
severity high
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:48:35Z ...
dedupe_key ta:technical_indicator_signal:bigMoveUp:big_move:V ...
throttle_s 0
created_at 2026-04-09T20:48:35.134608+00:00
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