Delete row sig_669eee53d01f from signals

id sig_669eee53d01f
event_id evt_2090647cfa82
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7857626 ...
threshold NULL
direction NULL
severity high
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T20:40:18Z ...
dedupe_key ta:technical_indicator_signal:bigMoveUp:big_move:G ...
throttle_s 0
created_at 2026-04-10T20:40:18.683446+00:00
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