Delete row sig_8496d4071b34 from signals

id sig_8496d4071b34
event_id evt_62d62aa93252
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6467759 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T20:35:26Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-10T20:35:26.256996+00:00
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