Delete row sig_8cb90e549986 from signals

id sig_8cb90e549986
event_id evt_9e4b294c1cc2
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5297592 ...
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:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-13T20:29:00.617087+00:00
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