Delete row sig_bc8ea9540a51 from signals

id sig_bc8ea9540a51
event_id evt_55064600e72e
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5989254 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T20:15:08Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-10T20:15:08.683424+00:00
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