Delete row sig_dca9bd2469a5 from signals

id sig_dca9bd2469a5
event_id evt_76ec2e49ab6b
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6261137 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T22:24:18Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-17T22:24:18.156568+00:00
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