Delete row sig_81ab8b40a5df from signals

id sig_81ab8b40a5df
event_id evt_6cc6c6dedd9f
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6242523 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:54:09Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-17T20:54:09.338552+00:00
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