Delete row sig_2a3bd33e40bf from signals

id sig_2a3bd33e40bf
event_id evt_63d549d6efab
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5593050 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:07:53Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-21T20:07:53.138167+00:00
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