Delete row sig_27b8276e5576 from signals

id sig_27b8276e5576
event_id evt_960860de21e6
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5774197 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-03T20:25:57Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-06T20:25:57.951958+00:00
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