Delete row sig_93e3d9576220 from signals

id sig_93e3d9576220
event_id evt_0042cc5b8c69
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":316,"confidence":0.7708336 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-13T01:19:47Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-16T01:19:47.067810+00:00
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