Delete row sig_b6d24c483c32 from signals

id sig_b6d24c483c32
event_id evt_ba6f1e188ea8
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.6530765 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T23:59:30Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-17T23:59:30.579684+00:00
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