Delete row sig_e1c8ffda1980 from signals

id sig_e1c8ffda1980
event_id evt_4a1c9b00eb8c
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":31,"confidence":0.86050660 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-17T20:17:10Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-20T20:17:10.987913+00:00
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