Delete row sig_3f825013eba9 from signals

id sig_3f825013eba9
event_id evt_193f3d3c361c
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5818423 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T20:41:20Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-03T20:41:20.609724+00:00
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