Delete row sig_8139478cd84a from signals

id sig_8139478cd84a
event_id evt_907dbc52784c
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":209,"confidence":0.5185249 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:59:09Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T20:59:09.212675+00:00
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