Delete row sig_97b311af637b from signals

id sig_97b311af637b
event_id evt_2bd1f8bc18be
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.4964160 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:25:08Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T20:25:08.119783+00:00
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