Delete row sig_ba7ed822cbc7 from signals

id sig_ba7ed822cbc7
event_id evt_4e16160d36a0
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5835123 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T01:59:07Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T01:59:07.601412+00:00
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