Delete row sig_4f19e8d2294f from signals

id sig_4f19e8d2294f
event_id evt_9412894f6be8
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6007526 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:03:00Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-21T20:03:00.836676+00:00
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