Delete row sig_9fab8b49d71a from signals

id sig_9fab8b49d71a
event_id evt_34328ec9f4b9
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":128,"confidence":0.5310199 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:17:55Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-09T20:17:55.410532+00:00
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