Delete row sig_b8c2cfa2295a from signals

id sig_b8c2cfa2295a
event_id evt_5fc0781b8075
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":506,"confidence":0.6242499 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T20:50:44Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-03T20:50:44.476861+00:00
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