Delete row sig_899bb9fa2cd7 from signals

id sig_899bb9fa2cd7
event_id evt_545470eed4b6
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":505,"confidence":0.4918138 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T20:41:20Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-03T20:41:20.609724+00:00
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