Delete row sig_fac9aefeb7be from signals

id sig_fac9aefeb7be
event_id evt_e201ec7d3abb
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5915499 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T00:28:47Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-08T00:28:47.137066+00:00
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