Delete row sig_8e71529959ec from signals

id sig_8e71529959ec
event_id evt_9749d127b42b
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":216,"confidence":0.5517045 ...
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:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-17T02:16:58.290049+00:00
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