Delete row sig_6a7644efd5d6 from signals

id sig_6a7644efd5d6
event_id evt_4cb65c8babdd
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5946100 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:25:08Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-08T20:25:08.119783+00:00
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