Delete row sig_18f368c73ed1 from signals

id sig_18f368c73ed1
event_id evt_40f1082e6e97
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5590285 ...
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:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-22T00:08:25.338522+00:00
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