Delete row sig_4b3c9bf23db2 from signals

id sig_4b3c9bf23db2
event_id evt_7d7dfc87c7c1
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.4933006 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T20:11:02Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-03T20:11:02.047021+00:00
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