Delete row sig_20a53c9c9657 from signals

id sig_20a53c9c9657
event_id evt_8d3023e56ec2
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5134145 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:07:53Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-21T20:07:53.138167+00:00
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