Delete row sig_b12f60cac52b from signals

id sig_b12f60cac52b
event_id evt_e792f9e4e58f
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":287,"confidence":0.5528715 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T03:42:26Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T03:42:26.961152+00:00
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