Delete row sig_419664aaa546 from signals

id sig_419664aaa546
event_id evt_3def12f58d68
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5430244 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T03:24:25Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-08T03:24:25.689146+00:00
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