Delete row sig_6045c486d5c5 from signals

id sig_6045c486d5c5
event_id evt_0319f440a059
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5722814 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-17T20:37:01Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-20T20:37:01.312815+00:00
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