Delete row sig_d9729c1a2048 from signals

id sig_d9729c1a2048
event_id evt_766e668fd7ff
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7719612 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-10T20:18:57Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-13T20:18:57.045053+00:00
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