Delete row sig_ed8eb51661fd from signals

id sig_ed8eb51661fd
event_id evt_2a28e401ed57
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":145,"confidence":0.4958158 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T02:09:05Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T02:09:05.560176+00:00
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