Delete row sig_274c37a49a90 from signals

id sig_274c37a49a90
event_id evt_5fdd8651a2a9
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6001906 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-19T00:08:25Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-22T00:08:25.338522+00:00
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