Delete row sig_b57bbbfb08ad from signals

id sig_b57bbbfb08ad
event_id evt_8373003ef6e3
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":253,"confidence":0.5629823 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T20:56:10Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-03T20:56:10.895046+00:00
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