Delete row sig_86096876540e from signals

id sig_86096876540e
event_id evt_14ab9ea61613
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5581951 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:24:00Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-17T20:24:00.285898+00:00
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