Delete row sig_a8f467353337 from signals

id sig_a8f467353337
event_id evt_e29bb83f9449
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7883513 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-11T20:11:24Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-14T20:11:24.327349+00:00
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