Delete row sig_2e277f84636f from signals

id sig_2e277f84636f
event_id evt_31ea8339cb55
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5062234 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:04:00Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T20:04:00.179713+00:00
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