Delete row sig_4576d8073651 from signals

id sig_4576d8073651
event_id evt_0dba397a3fef
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":525,"confidence":0.6200551 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:15:05Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T20:15:05.036497+00:00
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