Delete row sig_1dd92701aadd from signals

id sig_1dd92701aadd
event_id evt_4fadc33ae424
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5952895 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T03:24:21Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T03:24:21.503803+00:00
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