Delete row sig_2284576b5b5b from signals

id sig_2284576b5b5b
event_id evt_2131f3ba19a7
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5488767 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-03T21:14:28Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-06T21:14:28.821588+00:00
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