Delete row sig_57b8ef5d4f5f from signals

id sig_57b8ef5d4f5f
event_id evt_96018c3b9d28
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6078262 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:49:04Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-17T20:49:04.121999+00:00
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