Delete row sig_f34aa87c9a43 from signals

id sig_f34aa87c9a43
event_id evt_6b6eff06f267
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7379739 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-13T20:27:42Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-16T20:27:42.234382+00:00
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