Delete row sig_4d563c7bf96e from signals

id sig_4d563c7bf96e
event_id evt_21e5fd69faf8
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5170618 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-19T03:44:00Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-22T03:44:00.815672+00:00
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