Delete row sig_38a1fb61c27f from signals

id sig_38a1fb61c27f
event_id evt_98be1f995a28
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6301960 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-17T20:11:54Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-20T20:11:54.360053+00:00
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