Delete row sig_1eb79c11eb60 from signals

id sig_1eb79c11eb60
event_id evt_ec1baf2ddf46
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":486,"confidence":0.5060214 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:48:35Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-09T20:48:35.134608+00:00
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