Delete row sig_8900072827cc from signals

id sig_8900072827cc
event_id evt_80a74d9df58d
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.4944583 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:02:53Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-09T20:02:53.519133+00:00
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