Delete row sig_009c8e08e794 from signals

id sig_009c8e08e794
event_id evt_b758a0912f84
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6229182 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-19T00:08:25Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-22T00:08:25.338522+00:00
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