Delete row sig_5b22d4bbb882 from signals

id sig_5b22d4bbb882
event_id evt_f9c1b54ff97c
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":155,"confidence":0.5621212 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T02:16:58Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-17T02:16:58.290049+00:00
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