Delete row sig_e7377f1c5830 from signals

id sig_e7377f1c5830
event_id evt_f50e8d7e1f54
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5621322 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-11T20:01:25Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-14T20:01:25.430832+00:00
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