Delete row sig_349535578679 from signals

id sig_349535578679
event_id evt_81a47fea4234
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5871505 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T21:01:30Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-03T21:01:30.631075+00:00
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