Delete row sig_2c5870b6cb10 from signals

id sig_2c5870b6cb10
event_id evt_c3db7ac0aec0
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":32,"confidence":0.76687989 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:33:02Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-21T20:33:02.567841+00:00
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