Delete row sig_4c372f8a9a64 from signals

id sig_4c372f8a9a64
event_id evt_62fb43db3bc9
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.4985941 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T21:09:14Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T21:09:14.958002+00:00
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