Delete row sig_506403789067 from signals

id sig_506403789067
event_id evt_e233eec94fbf
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5636385 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-13T20:17:12Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-16T20:17:12.542264+00:00
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