Delete row sig_39eb7b069205 from signals

id sig_39eb7b069205
event_id evt_88ae12283377
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.4981431 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T00:53:46Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T00:53:46.492075+00:00
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