Delete row sig_08b362adf8cd from signals

id sig_08b362adf8cd
event_id evt_13a395092320
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5060814 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T02:09:05Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T02:09:05.560176+00:00
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