Delete row sig_c637fab32d97 from signals

id sig_c637fab32d97
event_id evt_1f11973124e2
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":415,"confidence":0.5292413 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T21:11:20Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-03T21:11:20.195900+00:00
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