Delete row sig_d1b693731786 from signals

id sig_d1b693731786
event_id evt_2ced9d40a896
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5082882 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-17T20:06:57Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-20T20:06:57.087320+00:00
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