Delete row sig_06f3977b7311 from signals

id sig_06f3977b7311
event_id evt_bb754758a897
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5799531 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T20:20:09Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-08T20:20:09.226883+00:00
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