Delete row sig_f57a3d0dde5a from signals

id sig_f57a3d0dde5a
event_id evt_60dfda9f4174
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5456122 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:53:37Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-09T20:53:37.814707+00:00
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