Delete row sig_46be31db6876 from signals

id sig_46be31db6876
event_id evt_ffbc1348bf81
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5341633 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T21:04:13Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T21:04:13.196401+00:00
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