Delete row sig_4e88305c9e50 from signals

id sig_4e88305c9e50
event_id evt_16812dfcc4c8
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5853079 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:44:04Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-17T20:44:04.423656+00:00
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