Delete row sig_55d9bd7b9596 from signals

id sig_55d9bd7b9596
event_id evt_620eddb5c18b
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":35,"confidence":0.75597339 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T21:15:46Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-03T21:15:46.445253+00:00
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