Delete row sig_a3c36f14dd65 from signals

id sig_a3c36f14dd65
event_id evt_f43815d40f7a
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5395163 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-17T20:27:03Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-20T20:27:03.316088+00:00
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