Delete row sig_57ecda517408 from signals

id sig_57ecda517408
event_id evt_c4c091b6e5cd
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5000363 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-19T03:03:52Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-22T03:03:52.867007+00:00
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