Delete row sig_15a5f1a7d982 from signals

id sig_15a5f1a7d982
event_id evt_2f90a77b3bc1
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7589640 ...
threshold NULL
direction NULL
severity high
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:02:53Z ...
dedupe_key ta:technical_indicator_signal:bigMoveDown:big_move ...
throttle_s 0
created_at 2026-04-09T20:02:53.519133+00:00
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