Delete row sig_3845b93a8dad from signals

id sig_3845b93a8dad
event_id evt_cf6e4f60e67b
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6930627 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-13T20:01:59Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-16T20:01:59.882586+00:00
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