Delete row sig_0b510831ba1f from signals

id sig_0b510831ba1f
event_id evt_d0b86442a59e
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5129113 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T21:09:14Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T21:09:14.958002+00:00
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