Delete row sig_f3fdb2c4dfe3 from signals

id sig_f3fdb2c4dfe3
event_id evt_21e33d5a3161
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.8301478 ...
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:bigMoveUp:big_move:R ...
throttle_s 0
created_at 2026-04-09T20:02:53.519133+00:00
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