Delete row sig_a57eed67004b from signals

id sig_a57eed67004b
event_id evt_fa4c856c30cf
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5085682 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:27:56Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-21T20:27:56.987653+00:00
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