Delete row sig_8490599407c4 from signals

id sig_8490599407c4
event_id evt_b45233f747ad
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5357971 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T03:20:55Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-09T03:20:55.881211+00:00
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