Delete row sig_ab1b9321a3c3 from signals

id sig_ab1b9321a3c3
event_id evt_bb0f93c5fee4
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5733379 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:38:03Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-21T20:38:03.706273+00:00
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