Delete row sig_643a19611232 from signals

id sig_643a19611232
event_id evt_60d0296b82c9
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5799454 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-17T20:06:57Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-20T20:06:57.087320+00:00
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