Delete row sig_93478fe56739 from signals

id sig_93478fe56739
event_id evt_52127df3b292
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5267688 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T21:30:14Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T21:30:14.820487+00:00
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