Delete row sig_6354a000496c from signals

id sig_6354a000496c
event_id evt_3b0b2a26740d
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5058285 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-05T00:28:47Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-08T00:28:47.137066+00:00
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