Delete row sig_6763e27054f4 from signals

id sig_6763e27054f4
event_id evt_552270e8bbc0
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":334,"confidence":0.7139337 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T20:07:55Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-09T20:07:55.116892+00:00
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