Delete row sig_28268d44eb76 from signals

id sig_28268d44eb76
event_id evt_cad71014e9c2
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":507,"confidence":0.5685654 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-11T20:36:29Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-14T20:36:29.559554+00:00
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