Delete row sig_161b8a311dfe from signals

id sig_161b8a311dfe
event_id evt_de273979a8ee
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6457131 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T21:20:15Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-10T21:20:15.103563+00:00
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