Delete row sig_517b4514daf8 from signals

id sig_517b4514daf8
event_id evt_37f8411a8b7f
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5074752 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-15T00:09:29Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-18T00:09:29.980154+00:00
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