Delete row sig_777693f5a7f3 from signals

id sig_777693f5a7f3
event_id evt_411671859c76
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6600467 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T02:16:58Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T02:16:58.290049+00:00
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