Delete row sig_bb5643c17a6b from signals

id sig_bb5643c17a6b
event_id evt_9c43720244ca
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6077771 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:02:53Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-09T20:02:53.519133+00:00
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