Delete row sig_715b071d7824 from signals

id sig_715b071d7824
event_id evt_ca44f8c5117a
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7925399 ...
threshold NULL
direction NULL
severity high
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:54:09Z ...
dedupe_key ta:technical_indicator_signal:bigMoveUp:big_move:V ...
throttle_s 0
created_at 2026-04-17T20:54:09.338552+00:00
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