Delete row sig_258f9032b3f2 from signals

id sig_258f9032b3f2
event_id evt_39ef3454ad05
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5080184 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T20:41:20Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-03T20:41:20.609724+00:00
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