Delete row sig_d7a00babf372 from signals

id sig_d7a00babf372
event_id evt_aa8c0abfbb59
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5824414 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-17T20:17:10Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-20T20:17:10.987913+00:00
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