Delete row sig_47c91ad299e1 from signals

id sig_47c91ad299e1
event_id evt_b990cd62cf55
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":143,"confidence":0.5099157 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-10T20:29:00Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-13T20:29:00.617087+00:00
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