Delete row sig_66060546bbbf from signals

id sig_66060546bbbf
event_id evt_89a5ec264ef9
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.8161385 ...
threshold NULL
direction NULL
severity high
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:53:37Z ...
dedupe_key ta:technical_indicator_signal:bigMoveUp:big_move:R ...
throttle_s 0
created_at 2026-04-09T20:53:37.814707+00:00
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